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Note: This page contains sample records for the topic "led light emitting" from the National Library of EnergyBeta (NLEBeta).
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1

Light Emitting Diode (LED) Lighting and Systems  

Science Conference Proceedings (OSTI)

This EPRI Technical Update addresses the most promising and unique energy efficient light source light emitting diode (LED) lighting. Business and technical market factors (Chapter 2) explain the upcoming growth of the LED and LED lighting market. Future technical improvements to LEDs and systems are also emphasized. Discussion of the importance of utility involvement in helping their customers make the switch from traditional lighting to LED lighting is provided. LED lighting technologies are covered in...

2007-12-21T23:59:59.000Z

2

Light Emitting Diodes (LEDs) for General Illumiation  

NLE Websites -- All DOE Office Websites (Extended Search)

LIGHT LIGHT EMITTING DIODES (LEDS) FOR GENERAL ILLUMINATION AN OIDA TECHNOLOGY ROADMAP An OIDA Report March 2001 Co-Sponsored by DOE/BTS and OIDA Compiled by Eric D. Jones Sandia National Laboratories OIDA Member Use Only OIDA OPTOELECTRONICS INDUSTRY DEVELOPMENT ASSOCIATION 1133 Connecticut Avenue, NW Suite 600 Washington, DC 20036 Ph: (202) 785-4426 Fax: (202) 785-4428 Web: http://www.OIDA.org © 2001 OIDA Optoelectronics Industry Development Association All data contained in this report is proprietary to OIDA and may not be distributed in either original or reproduced form to anyone outside the client's internal organization within five years of the report date without prior written permission of the Optoelectronics Industry Development Association. Published by: Optoelectronics Industry Development Association

3

LIGHT EMITTING DIODE (LED) TRAFFIC SIGNAL SURVEY RESULTS  

E-Print Network (OSTI)

CALIFORNIA ENERGY COMMISSION LIGHT EMITTING DIODE (LED) TRAFFIC SIGNAL SURVEY RESULTS STAFFREPORT: Assistance needs 26 Item 12: Information requested 28 Appendix A: Light Emitting Diode (LED) Traffic Signal efficiency upgrades. - 29 - #12;APPENDIX A - 30 - #12;California Energy Commission Light Emitting Diode (LED

4

Outdoor Light-Emitting Diode (LED) Digital Signage  

Science Conference Proceedings (OSTI)

Utilities have been supporting outdoor advertising companies and their traditional simple billboards for many years. The level of support these billboards needed was minimal because electricity for them was only used to power basic lighting technologies. The growth in the billboard industry combined with the explosion in available electronic and digital systems and the advancements made in light-emitting diodes (LEDs) has resulted in a new type of billboard8212the LED electronic billboard. Electronic bil...

2009-12-17T23:59:59.000Z

5

Comparing Light-Emitting Diode (LED) Street and Area Lighting to Traditional Lighting Technologies  

Science Conference Proceedings (OSTI)

Manufacturing advances have now made the use of light-emitting diode (LED) technology practical for street and area lighting. To better understand the application, the Electric Power Research Institute (EPRI) teamed with Southern Company and Gulf Power to install LED street lights at a demonstration site and measure their performance. The data showed several disadvantages for the LED lights, such as a lower efficacy compared to traditional technology and lower immunity to electrical disturbances, but an ...

2012-04-06T23:59:59.000Z

6

DOE Science Showcase - Light-emitting Diode (LED) Lighting Research | OSTI,  

Office of Scientific and Technical Information (OSTI)

Science Showcase - Light-emitting Diode (LED) Lighting Research Science Showcase - Light-emitting Diode (LED) Lighting Research Light-emitting diode (LED) lighting is a type of solid-state lighting that uses a semiconductor to convert electricity to light. LED lighting products are beginning to appear in a wide variety of home, business, and industrial products such as holiday lighting, replacement bulbs for incandescent lamps, street lighting, outdoor area lighting and indoor ambient lighting. Over the past decade, LED technology research and development supported by the U.S. Department of Energy (DOE) has yielded impressive improvements in the cost, color performance, light output, efficacy, reliability, lifetime, and manufacturability of LED products and this upward trend is expected to continue. Read about the latest DOE research, the technology behind LEDs,

7

A Comparison of Infrared Light Emitting Diodes (IR-LED) versus Infrared  

E-Print Network (OSTI)

B. Characteristics of a typical IR LED analogous to the typeLight Emitting Diodes (IR-LED) versus Infrared Helium-Neon (light emitting diode (IR-LED) to quantitatively measure fuel

Girard, James W.; Bogin, Gregory E; Mack, John Hunter; Chen, J-Y; Dibble, Rober W

2005-01-01T23:59:59.000Z

8

Comparing Light Emitting Diode (LED) Street and Area Lighting to Traditional Lighting Technologies  

Science Conference Proceedings (OSTI)

High-power light-emitting diode (LED) technology holds great promise for outdoor illumination. This case study discusses the results of the LED Street and Area Lighting Demonstration performed by Tennessee Valley Authority (TVA), Knoxville Utilities Board (KUB), and EPRI. Data was collected on Wall Avenue, a busy thoroughfare in downtown Knoxville, using a specially developed computer-controlled mobile light measurement vehicle with a global positioning system.Early reports from the ...

2012-09-28T23:59:59.000Z

9

Comparing Light-Emitting Diode (LED) Street and Area Lighting to Traditional Lighting Technologies  

Science Conference Proceedings (OSTI)

Manufacturing advances have now made the use of light-emitting diode (LED) technology practical for street and area lighting. To better understand the application, the Electric Power Research Institute (EPRI) teamed with Southern Company and Alabama Power to install LED street lights at a demonstration site and measure the performance. The data showed several disadvantages such as a lower efficacy compared to traditional technology and lower immunity to electrical disturbances, but advantages in energy s...

2012-04-20T23:59:59.000Z

10

LED Lighting  

Energy.gov (U.S. Department of Energy (DOE))

Light-emitting diodes (LEDs) are light sources that differ from more traditional sources of light in that they are semiconductor devices that produce light when an electrical current is applied....

11

Light Emitting Diode (LED) fiducial system: Setup and operation  

SciTech Connect

Streak cameras, either electronic or rotating mirror, are common diagnostic tools used to explore very fast phenomena. Often they are used to precisely time events or durations, and in most cases, it is important to have quality time marks on the film record. Many methods have been used to introduce time marks onto the film. Exploding bridge wires are frequently used, but they light up slowly and are difficult to read with consistent accuracy. It is also difficult to put more than a few bridge wires in the view of a camera slit, so there are only a few timing marks written to the film. In some cases the time scale on the film must be interpolated over long distances, creating a significant loss of accuracy. Interpolation is especially troublesome with those cameras that have a nonlinear sweep rate. Spark gaps located on the camera slit turn on a bit faster, but suffer from the same interpolation induced errors. A series of short duration laser pulses, accurately timed and introduced along the edges of the film, is a very fine solution. The problem with such a laser fiducial system is that the lasers are very expensive and difficult to maintain. There has been a need for many years for an inexpensive, very bright light source that can be repetitively pulsed accurately and with short duration. Various technologies have sufficiently developed over the past few years, allowing us to build a fiducial system based on light emitting diodes (LED) for the Cordin rotating mirror streak cameras.

Muelder, S.A.

1995-01-01T23:59:59.000Z

12

Demonstration Assessment of Light-Emitting Diode (LED) Accent Lighting at the Field Museum in Chicago, IL  

SciTech Connect

This report reviews a demonstration of light-emitting diode (LED) accent lighting compared to halogen (typical) accent lighting in a gallery of the Field Museum in Chicago, IL.

Myer, Michael; Kinzey, Bruce R.

2010-12-10T23:59:59.000Z

13

Comparing Light-Emitting Diode (LED) Street and Area Lighting to Traditional Lighting Technologies  

Science Conference Proceedings (OSTI)

In 2008, the Tennessee Valley Authority (TVA) and Benton County Electric System partnered with the Electric Power Research Institute (EPRI) to launch an investigation into the use of LED technology for area lighting. The goal of the project—called the LED Street and Area Lighting Demonstration—was to discover a better light bulb, one that not only meets the outdoor lighting requirements of consumers, but also uses less electricity in doing so. This case study discusses the results of ...

2012-09-28T23:59:59.000Z

14

Comparing Light-Emitting Diode (LED) Street and Area Lighting to Traditional Lighting Technologies: Assessing LED Performance at Gul f Power in Pensacola, Florida  

Science Conference Proceedings (OSTI)

Manufacturing advances have now made the use of light-emitting diode (LED) technology practical for street and area lighting. To better understand the application, the Electric Power research Institute (EPRI teamed with Southern Company and Gulf Power to install LED street lights at a demonstration site and measure the performance. The data showed several disadvantages such as a lower efficacy compared to traditional technology and lower immunity to electrical disturbances, but advantages in energy savin...

2012-04-21T23:59:59.000Z

15

Demonstration Assessment of Light-Emitting Diode (LED) Parking Lot Lighting in Leavenworth, KS  

SciTech Connect

This report describes the process and results of a demonstration of solid-state lighting (SSL) technology in a commercial parking lot lighting application, under the U.S. Department of Energy (DOE) Solid-State Lighting Technology GATEWAY Demonstration Program. The parking lot is for customers and employees of a Walmart Supercenter in Leavenworth, Kansas and this installation represents the first use of the LED Parking Lot Performance Specification developed by the DOE’s Commercial Building Energy Alliance. The application is a parking lot covering more than a half million square feet, lighted primarily by light-emitting diodes (LEDs). Metal halide wall packs were installed along the building facade. This site is new construction, so the installed baseline(s) were hypothetical designs. It was acknowledged early on that deviating from Walmart’s typical design would reduce the illuminance on the site. Walmart primarily uses 1000W pulse-start metal halide (PMH) lamps. In order to provide a comparison between both typical design and a design using conventional luminaires providing a lower illuminance, a 400W PMH design was also considered. As mentioned already, the illuminance would be reduced by shifting from the PMH system to the LED system. The Illuminating Engineering Society of North America (IES) provides recommended minimum illuminance values for parking lots. All designs exceeded the recommended illuminance values in IES RP-20, some by a wider margin than others. Energy savings from installing the LED system compared to the different PMH systems varied. Compared to the 1000W PMH system, the LED system would save 63 percent of the energy. However, this corresponds to a 68 percent reduction in illuminance as well. In comparison to the 400W PMH system, the LED system would save 44 percent of the energy and provide similar minimum illuminance values at the time of relamping. The LED system cost more than either of the PMH systems when comparing initial costs. However, when the life-cycle costs from energy and maintenance were factored into the scenario, the LED system had lower costs at the end of a 10-year analysis period. The LED system had a 6.1 year payback compared to the 1000W PMH system and a 7.5 year payback versus the 400W PMH system. The costs reflect high initial cost for the LED luminaire, plus more luminaires and (subsequently) more poles for the LED system. The other major issue affecting cost effectiveness was that Leavenworth, Kansas has very low electricity costs. The melded rate for this site was $0.056 per kWh for electricity. However, if the national electricity rate of $0.1022/kWh was used the payback would change to between four and five years for the LED system. This demonstration met the GATEWAY requirements of saving energy, matching or improving illumination, and being cost effective. The project also demonstrated that the Commercial Building Energy Alliance (CBEA) specification works in practice. Walmart appreciated having an entire site lighted by LEDs to gain more experience with the technology. Walmart is reviewing the results of the demonstration as they consider their entire real estate portfolio.

Myer, Michael; Kinzey, Bruce R.; Curry, Ku'uipo

2011-05-06T23:59:59.000Z

16

Demonstration Assessment of Light-Emitting Diode (LED) Post-Top Lighting at Central Park in New York City  

SciTech Connect

A review of five post-top light-emitting diode (LED) pedestrian luminaires installed in New York City's Central Park for possible replacement to the existing metal halide post-top luminaire. This report reviews the energy savings potential and lighting delivered by the LED post-top luminaires.

Myer, Michael; Goettel, Russell T.; Kinzey, Bruce R.

2012-09-30T23:59:59.000Z

17

Potential Environmental Impacts from the Metals in Incandescent, Compact Fluorescent Lamp (CFL), and Light-Emitting Diode (LED)  

E-Print Network (OSTI)

), and Light-Emitting Diode (LED) Bulbs Seong-Rin Lim, Daniel Kang, Oladele A. Ogunseitan,,§ and Julie M sources with compact fluorescent lamp (CFL) and light-emitting diode (LED) bulbs that use about 70% and 85 lighting systems are transitioning from incandes- cent to compact fluorescent lamp (CFL) and light

Short, Daniel

18

The use of LEDS (light-emitting diode) to simulate weak YAG-laser beams  

SciTech Connect

The purpose of this report is to determine whether and under what conditions a light-emitting diode may be used to simulate a weak YAG-laser beam that has been scattered by a distant reflecting object. By examining the differences between laser radiation and LED radiation, the author concludes that there is no theoretical reason that a LED may not be used in place of the laser beam.

Young, M.

1981-01-01T23:59:59.000Z

19

LED Lighting | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

LED Lighting LED Lighting August 16, 2013 - 10:07am Addthis Light-emitting diodes (LEDs) are light sources that differ from more traditional sources of light in that they are...

20

Assessment of Electrical, Efficiency, and Photometric Performance of Advanced Lighting Sources: Dimmable Advanced Lighting Technolog ies -- Electronic Light-Emitting Diode (LED) Fixtures, Lamps, and Drivers  

Science Conference Proceedings (OSTI)

This EPRI Technical Update addresses the dimming performance of light-emitting diode (LED) lighting. Chapter 1 provides a discussion of basic lighting control, the importance of considering power quality in lighting control, lighting control methods and parameters, and the advantages and future of lighting control. Chapter 2 addresses in more depth the dimming methods used in advanced lighting sources and controls for incandescent, fluorescent, high-intensity discharge (HID) and LED sources. Chapter 3 ad...

2008-12-19T23:59:59.000Z

Note: This page contains sample records for the topic "led light emitting" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Demonstration Assessment of Light-Emitting Diode (LED) Street Lighting Host Site: Lija Loop, Portland, Oregon  

SciTech Connect

This report describes the process and results of a demonstration of solid-state lighting (SSL) technology in a residential street lighting application, under the U.S. Department of Energy GATEWAY Solid-State Lighting Technology Demonstration Program. In this project, eight 100W (nominal) high-pressure sodium cobra head fixtures were replaced with a like number of LED street light luminaires manufactured by Leotek, Inc. The Leotek product achieved an estimated payback in the Lija Loop installation of about 20 years for replacement scenarios and a much shorter 7.6 years for new installations. Much of the associated energy savings (55%) supporting these payback periods, however, were achieved by reducing average horizontal photopic illuminance a similar amount (53%). Examined from a different perspective, the measured performance suggests that the Leotek product is at approximate parity with the HPS cobra head in terms of average delivered photopic illumination for a given power consumption. HPS comprises the second most efficacious street lighting technology available, exceeded only by low pressure sodium (LPS). LPS technology is not considered suitable for most street lighting applications due to its monochromatic spectral output and poor color rendering ability; therefore, this LED product is performing at an efficiency level comparable to its primary competition in this application.

Kinzey, Bruce R.; Myer, Michael

2009-11-01T23:59:59.000Z

22

Prospects for LED lighting.  

SciTech Connect

Solid-state lighting using light-emitting diodes (LEDs) has the potential to reduce energy consumption for lighting by 50% while revolutionizing the way we illuminate our homes, work places, and public spaces. Nevertheless, substantial technical challenges remain in order for solid-state lighting to significantly displace the well-developed conventional lighting technologies. We review the potential of LED solid-state lighting to meet the long-term cost goals.

Tsao, Jeffrey Yeenien; Gee, James Martin; Simmons, Jerry Alvon

2003-08-01T23:59:59.000Z

23

Energy Basics: LED Lighting  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

positivenegative junction of the diode, the electrons slow down to orbit at a lower energy level. The electrons emit the excess energy as photons of light. LEDs are often used...

24

Demonstration Assessment of Light Emitting Diode (LED) Commercial Garage Lights In the Providence Portland Medical Center, Portland, Oregon  

SciTech Connect

This U.S. Department of Energy GATEWAY Demonstration project studied the applicability of light-emitting diode (LED) luminaires for commercial parking garage applications. High-pressure sodium (HPS) area luminaires were replaced with new LED area luminaires. The project was supported under the U.S. Department of Energy (DOE) Solid State Lighting Program. Other participants in the demonstration project included Providence Portland Medical Center in Portland, Oregon, the Energy Trust of Oregon, and Lighting Sciences Group (LSG) Inc. Pacific Northwest National Laboratory (PNNL) conducted the measurements and analysis of the results. PNNL manages GATEWAY demonstrations for DOE and represents their perspective in the conduct of the work. Quantitative and qualitative measurements of light and electrical power were taken at the site for both HPS and LED light sources. Economic costs were estimated and garage users’ responses to the new light sources were gauged with a survey. Six LED luminaires were installed in the below-ground parking level A, replacing six existing 150W HPS lamps spread out over two rows of parking spaces. Illuminance measurements were taken at floor level approximately every 4 ft on a 60-ft x 40-ft grid to measure light output of these LED luminaires which were termed the “Version 1” luminaires. PNNL conducted power measurements of the circuit in the garage to which the 6 luminaires were connected and determined that they drew an average of 82 W per lamp. An improved LED luminaire, Version 2, was installed in Level B of the parking garage. Illuminance measurements were not made of this second luminaire on site due to higher traffic conditions, but photometric measurements of this lamp and Version 1 were made in an independent testing laboratory and power usage for Version 2 was also measured. Version 1 was found to produce 3600 lumens and Version 2 was found to produce 4700 lumens of light and to consume 78 Watts. Maximum and minimum light levels were measured for the HPS and LED Version 1 luminaires and projected for the Version 2 luminaires. Maximum light levels were 23.51 foot candles, 20.54 fc, and 26.7 fc respectively and minimum light levels were 1.49 fc, 1.45 fc, and 1.88 fc. These results indicate very similar or even slightly higher light levels produced by the LED lamps, despite the higher lumen output of the HPS lamp. The LED lamps provide higher luminaire efficacy because all of the light is directed down and out. None of it is “lost” in the fixture. Also the HPS luminaire had poorly designed optics and a plastic covering that tended to get dirty and cracked, further decreasing the realized light output.[is this an accurate way to say this?] Consumer perceptions of the Version 2 LED were collected via a written survey form given to maintenance and security personnel. More than half felt the LED luminaires provided more light than the HPS lamps and a majority expressed a preference for the new lamps when viewing the relamped area through a security camera. Respondents commented that the LED luminaires were less glary, created less shadows, had a positive impact on visibility, and improved the overall appearance of the area. PNNL conducted an economic analysis and found that the Version 1 lamp produced annual energy savings of 955 kWh and energy cost savings of $76.39 per lamp at electricity rates of 6.5 cents per kWh and $105.03 at 11 cents per kWh. PNNL found that the Version 2 lamp produced annual energy savings of 991 kWh and energy cost savings of $79.26 per lamp at electricity rates of 6.5 cents per kWh and $108.98 at 11 cents per kWh. PNNL also calculated simple payback and found that Version 1 showed paybacks of 5.4 yrs at 6.5c/kWh and 4.1 yrs at 11c/kWh while Version 2 showed paybacks of 5.2 yrs at 6.5c/kWh and 3.9 yrs at 11c/kWh.

Ton, My K.; Richman, Eric E.; Gilbride, Theresa L.

2008-11-11T23:59:59.000Z

25

LED Lighting | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

LED Lighting LED Lighting LED Lighting July 29, 2012 - 4:43pm Addthis LED Lighting What are the key facts? Quality LED products can last 25 times longer than an incandescent bulb and use 75% less energy. LEDs are directional, focusing light in ways that are useful in homes and commercial settings. The light-emitting diode (LED) is one of today's most energy-efficient and rapidly-developing lighting technologies. Quality LED light bulbs last longer, are more durable, and offer comparable or better light quality than other types of lighting. Check out the top 8 things about LEDs to learn more. Energy Savings LED is a highly energy efficient lighting technology, and has the potential to fundamentally change the future of lighting in the United States. Residential LEDs -- especially ENERGY STAR rated products -- use at least

26

Emitting Diode (LED) Fixture Design and Installation Criteria for Exterior Lighting Applications in Contingency Environments  

E-Print Network (OSTI)

1. Purpose. This ETL provides technical guidance and criteria for specifying, designing, and installing solar LED luminaire exterior lighting applications at Air Force overseas contingency locations only. For the purposes of this ETL, “contingency locations ” are defined as locations where a “named ” operation is the primary mission and the location utilizes expeditionary equipment for all or some of the support facilities in use. Requirements in this ETL are mandatory. Deviations require approval from the Air Force Electrical Engineering subject matter expert (SME), AFCESA/CEOA. Requests for deviations must be coordinated through the major command (MAJCOM) before submitting to AFCESA/CEOA. 2. Application. This ETL does not apply to LED airfield lighting systems, including, but not limited to, taxiway, obstruction, runway edge, threshold, or approach lighting systems

unknown authors

2012-01-01T23:59:59.000Z

27

Detecting indentations on documents pressed by pen tip force using a near infrared light emitting diode (NIR LED) and shape from shading  

Science Conference Proceedings (OSTI)

We proposed the new method that detected indentations pressed by pen tip force on paper using an oblique near infrared (NIR) emitting by light emitting diodes (LEDs). According to conventional methods indentations were observed by document examiners' ... Keywords: NIR LED, handwriting, indentations, shape from shading

Takeshi Furukawa

2010-11-01T23:59:59.000Z

28

Demonstration Assessment of Light-Emitting Diode (LED) Retrofit Lamps at the Lobby of the Bonneville Power Administration, Portland, OR  

SciTech Connect

This report describes the process and results of a demonstration of solid-state lighting (SSL) technology in the lobby of the Bonneville Power Administration (BPA) headquarters building in Portland, Oregon. The project involved a simple retrofit of 32 track lights used to illuminate historical black-and-white photos and printed color posters from the 1930s and 1940s. BPA is a federal power marketing agency in the Northwestern United States, and selected this prominent location to demonstrate energy efficient light-emitting diode (LED) retrofit options that not only can reduce the electric bill for their customers but also provide attractive alternatives to conventional products, in this case accent lighting for BPA's historical artwork.

Miller, Naomi

2011-07-01T23:59:59.000Z

29

Demonstration Assessment of Light-Emitting Diode (LED) Roadway Lighting at the I-35W Bridge, Minneapolis, MN  

SciTech Connect

This report describes the process and results of a demonstration of solid-state lighting (SSL) technology conducted in 2009 at the recently reconstructed I-35W bridge in Minneapolis, MN. The project was supported under the U.S. Department of Energy (DOE) Solid-State Lighting GATEWAY Technology Demonstration Program. Other participants in the demonstration project included the Minnesota Department of Transportation (Mn/DOT), Federal Highways Administration (FHWA), and BetaLED™ (a division of Ruud Lighting). Pacific Northwest National Laboratory (PNNL) conducted the measurements and analysis of the results. DOE has implemented a three-year evaluation of the LED luminaires in this installation in order to develop new longitudinal field data on LED performance in a challenging, real-world environment. This document provides information through the initial phase of the I-35W bridge project, up to and including the opening of the bridge to the public and the initial feedback received on the LED lighting installation from bridge users. Initial findings of the evaluation are favorable, with minimum energy savings level of 13% for the LED installation relative to the simulated base case using 250W high-pressure sodium (HPS) fixtures. The LEDs had an average illuminance level of 0.91 foot candles compared to 1.29 fc for the HPS lamps. The LED luminaires cost $38,000 more than HPS lamps, yielding a lengthy payback period, however the bridge contractor had offered to include the LED luminaires as part of the construction package at no additional cost. One potentially significant benefit of the LEDs in this installation is avoiding rolling lane closures on the heavily-traveled interstate bridge for the purpose of relamping the HPS fixtures. Rolling lane closures involve multiple crew members and various maintenance and safety vehicles, diversion of traffic, as well as related administrative tasks (e.g., approvals, scheduling, etc.). Mn/DOT records show an average cost of relamping fixtures along interstate roadways of between $130-150 per pole. The previous bridge saw a lamp mortality rate of approximately 50% every two years, though the new bridge was designed to minimize many of the vibration issues. A voluntary Web-based feedback survey of nearly 500 self-described bridge users showed strong preference for the LED lighting - positive comments outnumbered negative ones by about five-to-one.

Kinzey, Bruce R.; Myer, Michael

2009-08-31T23:59:59.000Z

30

nature materials | VOL 3 | SEPTEMBER 2004 | www.nature.com/naturematerials 601 ince 1993, InGaN light-emitting diodes (LEDs) have been  

E-Print Network (OSTI)

not fulfilled their original promise as solid-state replacements for light bulbs as their light, InGaN light-emitting diodes (LEDs) have been improved and commercialized1,2 , but these devices have and the spontaneous emissionrateinthesemiconductor3­9 ,andleadtotheenhancementof light emission by SP­QW coupling10

Okamoto, Koichi

31

Very high radiance edge-emitting LED  

SciTech Connect

A new light-emitting diode (LED) whose radiance is 1000 W/cm/sup 2/sr, an order of magnitude higher than any previous LED, is described. The LED is an (AlGa)As double-heterojunction edge-emitting structure. This structure acts as a waveguide for the internally generated light, and with appropriate Al concentration difference at the heterojunctions (..delta..x approximately equal to 0.3) and active region width (approximately 500 A), the radiation pattern perpendicular to the junction can be less than 30/sup 0/ (FWHM). For fiber-optic communications this LED is capable of coupling 850 ..mu..w, at a coupling loss of only -10 dB into a 0.14-numerical-aperture (NA), 90-..mu..m-diam low-loss fiber. The LED is capable of being directly modulated at 250 MHz and has a spectral width of less than 300 A.

Ettenberg, M.; Kressel, H.; Wittke, J.P.

1976-06-01T23:59:59.000Z

32

Demonstration Assessment of Light Emitting Diode (LED) Residential Downlights and Undercabinet Lights in the Lane County Tour of Homes, Eugene, Oregon  

SciTech Connect

In August 2008 the Pacific Northwest National Laboratory (PNNL) conducted a light emitting diode (LED) residential lighting demonstration project for the U.S. Department of Energy (DOE), Office of Building Technologies, as part of DOE’s Solid State Lighting (SSL) Technology Demonstration Gateway Program. Two lighting technologies, an LED replacement for downlight lamps (bulbs) and an LED undercabinet lighting fixture, were tested in the demonstration which was conducted in two homes built for the 2008 Tour of Homes in Eugene, Oregon. The homes were built by the Lane County Home Builders Association (HBA), and Future B Homes. The Energy Trust of Oregon (ETO) also participated in the demonstration project. The LED downlight product, the LR6, made by Cree LED Lighting Solutions acts as a screw-in replacement for incandescent and halogen bulbs in recessed can downlights. The second product tested is Phillips/Color Kinetics’ eW® Profile Powercore undercabinet fixture designed to mount under kitchen cabinets to illuminate the countertop and backsplash surfaces. Quantitative and qualitative measurements of light performance and electrical power usage were taken at each site before and after initially installed halogen and incandescent lamps were replaced with the LED products. Energy savings and simple paybacks were also calculated and builders who toured the homes were surveyed for their responses to the LED products. The LED downlight product drew 12 Watts of power, cutting energy use by 82% compared to the 65W incandescent lamp and by 84% compared to the 75W halogen lamp. The LED undercabinet fixture drew 10 watts, cutting energy use by 83% to 90% compared to the halogen product, which was tested at two power settings: a low power 60W setting and a high power 105W setting. The LED downlight consistently provided more light than the halogen and incandescent lamps in horizontal measurements at counter height and floor level. It also outperformed in vertical illuminance measurements taken on the walls, indicating better lateral dispersion of the light. The undercabinet fixture’s light output was midway between the low and high power halogen undercabinet fixture light outputs (35.8 foot candle versus 13.4 fc and 53.4 fc) but it produced a more uniform light (max/min ratio of 7.0 versus 10.8). The color correlated temperature (CCT, the blue or yellowness) of the LED light correlated well with the halogen and incandescent lights (2675 K vs 2700 K). The color rendering of the LED downlight also correlated well at 92 CRI compared to 100 CRI for the halogen and incandescent lamps. The LED undercabinet fixture had measures of 2880 K CCT and 71 CRI compared to the 2700 K and 100 CRI scores for the halogen undercabinet fixture. Builders who toured the homes were surveyed; they gave the LED downlight high marks for brightness, said the undercabinet improved shadows and glare and said both products improved overall visibility, home appearance, and home value. Paybacks on the LED downlight ranged from 7.6 years (assuming electricity cost of 11 c/kWh) to 13.5 years (at 5C/kWh). Paybacks on the LED undercabinet fixture in a new home ranged from 4.4 years (11c/kWh electricity) to 7.6 years (5c/kWh) based on product costs of $95 per LED downlight and $140 per LED undercabinet fixture at 3 hrs per day of usage for the downlight and 2 hrs per day for the undercabinet lighting.

Ton, My K.; Richman, Eric E.; Gilbride, Theresa L.

2008-11-10T23:59:59.000Z

33

Cree LED Lighting Solutions Formerly LED Lighting Fixtures LLF...  

Open Energy Info (EERE)

Cree LED Lighting Solutions Formerly LED Lighting Fixtures LLF Jump to: navigation, search Name Cree LED Lighting Solutions (Formerly LED Lighting Fixtures (LLF)) Place...

34

Lighting Group: Sources and Ballasts: LED Task Light  

NLE Websites -- All DOE Office Websites (Extended Search)

light The goal of this project is to accelerate the use of energy efficient light emitting diode (LED) technology for general lighting applications by developing a task lamp...

35

Demonstration Assessment of Light Emitting Diode (LED) Walkway Lighting at the Federal Aviation Administration William J. Hughes Technical Center, in Atlantic City, New Jersey  

SciTech Connect

This report documents the results of a collaborative project to demonstrate a solid state lighting (SSL) general illumination product in an outdoor area walkway application. In the project, six light-emitting diode (LED) luminaires were installed to replace six existing high pressure sodium (HPS) luminaires mounted on 14-foot poles on a set of exterior walkways and stairs at the Federal Aviation Administration (FAA) William J. Hughes Technical Center in Atlantic City, New Jersey, during December, 2007. The effort was a U.S. Department of Energy (DOE) SSL Technology Gateway Demonstration that involved a collaborative teaming agreement between DOE, FAA and Ruud Lighting (and their wholly owned division, Beta LED). Pre- and post-installation power and illumination measurements were taken and used in calculations of energy savings and related economic payback, while personnel impacted by the new lights were provided questionnaires to gauge their perceptions and feedback. The SSL product demonstrated energy savings of over 25% while maintaining illuminance levels and improving illuminance uniformity. PNNL's economic analysis yielded a variety of potential payback results depending on the assumptions used. In the best case, replacing HPS with the LED luminaire can yield a payback as low as 3 years. The new lamps were quite popular with the affected personnel, who gave the lighting an average score of 4.46 out of 5 for improvement.

Kinzey, Bruce R.; Myer, Michael

2008-03-18T23:59:59.000Z

36

Efficient Driver for Dimmable White LED Lighting.  

E-Print Network (OSTI)

??A high efficiency driver circuit is proposed for Light Emitting Diode (LED) lamps with dimming feature. The current regulation is accomplished by processing partial power… (more)

Yang, Wen-ching

2011-01-01T23:59:59.000Z

37

Demonstration Assessment of Light-Emitting Diode (LED) Roadway Lighting on Residential and Commercial Streets in Palo Alto, CA  

SciTech Connect

This report is part of a GATEWAY demonstration that replaced existing HPS streetlights with two different types of LED products and one induction product. Energy savings ranged from 6% to 44%.

Myer, Michael; Kinzey, Bruce R.; Tam, Christine

2010-06-24T23:59:59.000Z

38

Synthesis and luminescence properties of rare earth activated phosphors for near UV-emitting LEDs for efficacious generation of white light  

E-Print Network (OSTI)

Sun, Y. Luo, S. Lu. ?White light emitting diode by using a-silicates for near-UV light emitting diode applications,? J.Park, S.Y. Choi. ?White light-emitting diodes of GaN-based

Han, Jinkyu

2013-01-01T23:59:59.000Z

39

Long persistent light emitting diode  

Science Conference Proceedings (OSTI)

Light emitting diodes(LEDs)coated with Sr 2 Mg Si 2 O 7 : Eu 2 + Nd 3 + (blue) Sr Al 2 O 4 : Eu 2 + Dy 3 + (green) Sr S : Eu 2 + Y 3 + Ce 3 + (orange)

D. Jia; D. N. Hunter

2006-01-01T23:59:59.000Z

40

Today LED Holiday Lights, Tomorrow the World?  

SciTech Connect

This article for The APEM Advantage, the quarterly newsletter of the Association of Professional Energy Managers (APEM) describes the recent increase in the popularity of light emitting diode (LED) lighting and compares LED light output with that of incandescent and compact fluorescent lighting.

Gordon, Kelly L.

2004-12-20T23:59:59.000Z

Note: This page contains sample records for the topic "led light emitting" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

LED Lighting Basics | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

LED Lighting Basics LED Lighting Basics LED Lighting Basics August 16, 2013 - 10:07am Addthis Light-emitting diodes (LEDs) are light sources that differ from more traditional sources of light in that they are semiconductor devices that produce light when an electrical current is applied. Applying electrical current causes electrons to flow from the positive side of a diode to the negative side. Then, at the positive/negative junction of the diode, the electrons slow down to orbit at a lower energy level. The electrons emit the excess energy as photons of light. LEDs are often used as small indicator lights on various electronic devices. Because of their long life, durability, and efficiency, LEDs are becoming more common in residential, commercial, and outdoor area lighting

42

LIGHT EMITTING DIODE CHARACTERISTICS (SAMPLE LAB WRITEUP)  

E-Print Network (OSTI)

1 LIGHT EMITTING DIODE CHARACTERISTICS (SAMPLE LAB WRITEUP) John A. McNeill ECE Box 000 January 19, 1997 ABSTRACT This lab investigates the V-I characteristic of a light-emitting diode (LED

McNeill, John A.

43

Commercial Lighting and LED Lighting Incentives  

Energy.gov (U.S. Department of Energy (DOE))

Incentives for energy efficient commercial lighting equipment as well as commercial LED lighting equipment are available to businesses under the Efficiency Vermont Lighting and LED Lighting...

44

LED Street and Area Lighting Technologies  

Science Conference Proceedings (OSTI)

Light emitting diodes (LEDs) are being used for applications beyond just indicator lights. One of those applications, street and area lighting, is of considerable interest. This interest is generated by potential reductions that can be achieved in operating costs resulting from lower maintenance costs as well as potentially lower electricity costs that result from the higher efficiency of LED lamps in the systems, the capability to dim and control LED systems, and better light quality. This white paper l...

2008-07-09T23:59:59.000Z

45

Solid-State Lighting: LED Lighting Facts  

NLE Websites -- All DOE Office Websites (Extended Search)

Market-Based Programs Printable Version Share this resource Send a link to Solid-State Lighting: LED Lighting Facts to someone by E-mail Share Solid-State Lighting: LED Lighting Facts on Facebook Tweet about Solid-State Lighting: LED Lighting Facts on Twitter Bookmark Solid-State Lighting: LED Lighting Facts on Google Bookmark Solid-State Lighting: LED Lighting Facts on Delicious Rank Solid-State Lighting: LED Lighting Facts on Digg Find More places to share Solid-State Lighting: LED Lighting Facts on AddThis.com... LED Lighting Facts CALiPER Program Standards Development Technical Information Network Gateway Demonstrations Municipal Consortium Design Competitions LED Lighting Facts LED lighting facts - A Program of the U.S. DOE DOE's LED Lighting Facts® program showcases LED products for general

46

Synthesis and luminescence properties of rare earth activated phosphors for near UV-emitting LEDs for efficacious generation of white light  

E-Print Network (OSTI)

efficient, high-color-rendering LED lamps using oxyfluoridePhosphor selection for near UV LED solid state lighting,?and application for near UV LED solid state lighting,? ECS.

Han, Jinkyu

2013-01-01T23:59:59.000Z

47

Light emitting diode color rendition properties.  

E-Print Network (OSTI)

??This paper discusses the color rendition capabilities of light emitting diodes (LEDs) and their relationship with the current standard for color rendition quality. The current… (more)

Hood, Sean

2013-01-01T23:59:59.000Z

48

Electrically driven nanopyramid green light emitting diode  

Science Conference Proceedings (OSTI)

An electrically driven nanopyramid green light emitting diode(LED) was demonstrated. The nanopyramid arrays were fabricated from a GaN substrate by patterned nanopillar etch

S.-P. Chang; Y.-C. Chen; J.-K. Huang; Y.-J. Cheng; J.-R. Chang; K.-P. Sou; Y.-T. Kang; H.-C. Yang; T.-C. Hsu; H.-C. Kuo; C.-Y. Chang

2012-01-01T23:59:59.000Z

49

Demonstration Assessment of Light-Emitting Diode (LED) Parking Lot Lighting at T.J.Maxx in Manchester, NH Phase I  

SciTech Connect

A report describing the process and results of replacing existing parking lot lighting, looking at a LED option with occupancy sensors, and conventional alternates. Criteria include payback, light levels, occupant satisfaction. This report is Phase I of II. Phase I deals with initial installation.

Myer, Michael; Goettel, Russell T.

2010-06-29T23:59:59.000Z

50

Quantum Dot Light Emitting Diode  

SciTech Connect

The project objective is to create low cost coatable inorganic light emitting diodes, composed of quantum dot emitters and inorganic nanoparticles, which have the potential for efficiencies equivalent to that of LEDs and OLEDs and lifetime, brightness, and environmental stability between that of LEDs and OLEDs. At the end of the project the Recipient shall gain an understanding of the device physics and properties of Quantum-Dot LEDs (QD-LEDs), have reliable and accurate nanocrystal synthesis routines, and have formed green-yellow emitting QD-LEDs with a device efficiency greater than 3 lumens/W, a brightness greater than 400 cd/m{sup 2}, and a device operational lifetime of more than 1000 hours. Thus the aim of the project is to break the current cost-efficiency paradigm by creating novel low cost inorganic LEDs composed of inorganic nanoparticles.

Kahen, Keith

2008-07-31T23:59:59.000Z

51

Quantum Dot Light Emitting Diode  

SciTech Connect

The project objective is to create low cost coatable inorganic light emitting diodes, composed of quantum dot emitters and inorganic nanoparticles, which have the potential for efficiencies equivalent to that of LEDs and OLEDs and lifetime, brightness, and environmental stability between that of LEDs and OLEDs. At the end of the project the Recipient shall gain an understanding of the device physics and properties of Quantum-Dot LEDs (QD-LEDs), have reliable and accurate nanocrystal synthesis routines, and have formed green-yellow emitting QD-LEDs with a device efficiency greater than 3 lumens/W, a brightness greater than 400 cd/m2, and a device operational lifetime of more than 1000 hours. Thus the aim of the project is to break the current cost-efficiency paradigm by creating novel low cost inorganic LEDs composed of inorganic nanoparticles.

Keith Kahen

2008-07-31T23:59:59.000Z

52

Application of light emitting diodes as solid state light sources in analytical chemistry.  

E-Print Network (OSTI)

??Several analytical systems were developed with light emitting diodes (LEDs) as solid state light sources. With an LED as a light source, liquid core waveguide… (more)

Eom, In Yong

2005-01-01T23:59:59.000Z

53

Broadband light-emitting diode  

DOE Patents (OSTI)

A broadband light-emitting diode. The broadband light-emitting diode (LED) comprises a plurality of III-V compound semiconductor layers grown on a semiconductor substrate, with the semiconductor layers including a pair of cladding layers sandwiched about a strained-quantum-well active region having a plurality of different energy bandgaps for generating light in a wavelength range of about 1.3-2 .mu.m. In one embodiment of the present invention, the active region may comprise a first-grown quantum-well layer and a last-grown quantum-well layer that are oppositely strained; whereas in another embodiment of the invention, the active region is formed from a short-period superlattice structure (i.e. a pseudo alloy) comprising alternating thin layers of InGaAs and InGaAlAs. The use a short-period superlattice structure for the active region allows different layers within the active region to be simply and accurately grown by repetitively opening and closing one or more shutters in an MBE growth apparatus to repetitively switch between different growth states therein. The broadband LED may be formed as either a surface-emitting LED or as an edge-emitting LED for use in applications such as chemical sensing, fiber optic gyroscopes, wavelength-division-multiplexed (WDM) fiber-optic data links, and WDM fiber-optic sensor networks for automobiles and aircraft.

Fritz, Ian J. (Albuquerque, NM); Klem, John F. (Sandia Park, NM); Hafich, Michael J. (Albuquerque, NM)

1998-01-01T23:59:59.000Z

54

Broadband light-emitting diode  

DOE Patents (OSTI)

A broadband light-emitting diode is disclosed. The broadband light-emitting diode (LED) comprises a plurality of III-V compound semiconductor layers grown on a semiconductor substrate, with the semiconductor layers including a pair of cladding layers sandwiched about a strained-quantum-well active region having a plurality of different energy bandgaps for generating light in a wavelength range of about 1.3--2 {micro}m. In one embodiment of the present invention, the active region may comprise a first-grown quantum-well layer and a last-grown quantum-well layer that are oppositely strained; whereas in another embodiment of the invention, the active region is formed from a short-period superlattice structure (i.e. a pseudo alloy) comprising alternating thin layers of InGaAs and InGaAlAs. The use a short-period superlattice structure for the active region allows different layers within the active region to be simply and accurately grown by repetitively opening and closing one or more shutters in an MBE growth apparatus to repetitively switch between different growth states therein. The broadband LED may be formed as either a surface-emitting LED or as an edge-emitting LED for use in applications such as chemical sensing, fiber optic gyroscopes, wavelength-divisionmultiplexed (WDM) fiber-optic data links, and WDM fiber-optic sensor networks for automobiles and aircraft. 10 figs.

Fritz, I.J.; Klem, J.F.; Hafich, M.J.

1998-07-14T23:59:59.000Z

55

Demonstration Assessment of Light-Emitting Diode (LED) Retrofit Lamps at Intercontinental Hotel in San Francisco, CA  

SciTech Connect

This document is a report of observations and results obtained from a lighting demonstration project conducted under the U.S. Department of Energy (DOE) GATEWAY Demonstration Program. The program supports demonstrations of high-performance solid-state lighting (SSL) products in order to develop empirical data and experience with in-the-field applications of this advanced lighting technology. The DOE GATEWAY Demonstration Program focuses on providing a source of independent, third-party data for use in decision-making by lighting users and professionals; this data should be considered in combination with other information relevant to the particular site and application under examination. Each GATEWAY Demonstration compares SSL products against the incumbent technologies used in that location. Depending on available information and circumstances, the SSL product may also be compared to alternate lighting technologies. Though products demonstrated in the GATEWAY program have been prescreened and tested to verify their actual performance, DOE does not endorse any commercial product or in any way guarantee that users will achieve the same results through use of these products.

Miller, Naomi J.; Curry, Ku'Uipo J.

2010-11-01T23:59:59.000Z

56

LEDs: The Future of Lighting is Here | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

and the common household light bulb have in common? If your answer is that light emitting diode (LED) technology can power all these things, then you're pretty bright. LEDs...

57

The solar LED street light.  

E-Print Network (OSTI)

??The purpose of this essay is to analyze the component of the solar LED street lighting, such as structure, principle, characteristics and precautions for installation… (more)

Ma, Hao

2013-01-01T23:59:59.000Z

58

Zinc Oxide and Nitride Nanowire Based Light Emitting Diodes  

E-Print Network (OSTI)

lumens/W, the LED beats the incandescent bulb and is on thefor an LED as opposed to an incandescent light bulb as shownbulb, fluorescent lamp, and blue light emitting diode. (24) (25) 2.2 LED

Lai, Elaine Michelle

2009-01-01T23:59:59.000Z

59

Thermal pumping of light-emitting diodes  

E-Print Network (OSTI)

The work presented here is a study of thermally enhanced injection in light-emitting diodes (LEDs). This effect, which we refer to as "thermal pumping", results from Peltier energy exchange from the lattice to charge ...

Gray, Dodd (Dodd J.)

2011-01-01T23:59:59.000Z

60

Resonant cavity light?emitting diode  

Science Conference Proceedings (OSTI)

A novel concept of a light?emitting diode(LED) is proposed and demonstrated in which the active region of the device is placed in a resonantoptical cavity. As a consequence

E. F. Schubert; Y.?H. Wang; A. Y. Cho; L.?W. Tu; G. J. Zydzik

1992-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "led light emitting" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Analysis of surface plasmon mediated light emitting diode efficiency enhancement.  

E-Print Network (OSTI)

?? The extraction of light from current light emitting diodes (LEDs) is very low due to the large index of refraction mismatch between the semiconductor… (more)

Holmstedt, Jason

2011-01-01T23:59:59.000Z

62

Seeing the Light: LED Under-Cabinet and Recessed Downlights ...  

NLE Websites -- All DOE Office Websites (Extended Search)

operating at their optimum energy efficiency. I'm definitely drawn to the light-emitting diode (LED) under-cabinet and recessed downlights-just two of the many LED products....

63

West Oahu Solar Powered LED Lighting System  

Science Conference Proceedings (OSTI)

This report describes the design and construction of a solar powered lighting system on the island of Oahu that uses a new Light Emitting Diode (LED) lamp technology. With oil in limited supply and ever increasing energy costs, the construction of photovoltaic (PV) systems has the potential to reduce Hawaiis dependence on imported fossil fuels and help Hawaiian Electric Company (HECO) to meet Hawaiis Renewable Portfolio Standards (RPS).

2006-03-21T23:59:59.000Z

64

Light Emitting Diodes and General Lighting  

NLE Websites -- All DOE Office Websites (Extended Search)

Light Emitting Diodes and General Lighting Speaker(s): Martin Moeck Date: August 6, 2009 - 12:00pm Location: 90-3122 We give a short overview on high-power light emitting diodes,...

65

White light emitting diode as liquid crystal display backlight; High brightness light emitting diode as liquid crystal display backlight.  

E-Print Network (OSTI)

??The discovery of high brightness (white) light emitting diode (LED) is considered as a real threat to the current lighting industry in various applications. One… (more)

Soon, Chian Myau

2007-01-01T23:59:59.000Z

66

Functional Imprinting Structures on GaN-Based Light-Emitting ...  

Science Conference Proceedings (OSTI)

Keywords: GaN, light-emitting diode (LED), imprinting technology, far-field pattern modulation, light extraction. 1. Introduction. GaN-based light-emitting diodes ...

67

Water Cooling of High Power Light Emitting Diode Henrik Srensen  

E-Print Network (OSTI)

Water Cooling of High Power Light Emitting Diode Henrik Sørensen Department of Energy Technology and product lifetime. The high power Light Emitting Diodes (LED) belongs to the group of electronics

Sørensen, Henrik

68

New LED light sources and lamps for general illumination  

E-Print Network (OSTI)

of light source compared to traditional light sources like incandescent bulbs and fluorescent tubes bulb. LEDs emit colored light with a narrow spectral band of 20-30 nm, colors covering the spectralNew LED light sources and lamps for general illumination Carsten Dam-Hansen, Birgitte Thestrup

69

Metacapacitors for LED Lighting: Metacapacitors  

Science Conference Proceedings (OSTI)

ADEPT Project: The CUNY Energy Institute is developing less expensive, more efficient, smaller, and longer-lasting power converters for energy-efficient LED lights. LEDs produce light more efficiently than incandescent lights and last significantly longer than compact fluorescent bulbs, but they require more sophisticated power converter technology, which increases their cost. LEDs need more sophisticated converters because they require a different type of power (low voltage direct current, or DC) than what's generally supplied by power outlets. The CUNY Energy Institute is developing sophisticated power converters for LEDs that contain capacitors made from new, nanoscale materials. Capacitors are electrical components that are used to store energy. CUNY's unique capacitors are configured with advanced power circuits to more efficiently control and convert power to the LED lighting source. They also eliminate the need for large magnetic components, instead relying on networks of capacitors that can be easily printed on plastic substrate. CUNY's prototype LED power converter already meets DOE's 2020 projections for the energy efficiency of LED power converters.

None

2010-09-02T23:59:59.000Z

70

DOE Lighting Program Update: LED Validation Activities  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

DOE Lighting Program Update DOE Lighting Program Update LED Validation Activities Kelly Gordon Pacific Northwest National Laboratory Federal Utility Partnership Working Group April 15, 2010 Providence, RI www.ssl.energy.gov 2 | Solid-State Lighting Program Legislative Mandate The DOE is directed by U.S. government policy (EPACT 2005, Section 912) to: "...support research, development, demonstration, and commercial application activities related to advanced solid-state lighting technologies based on white light emitting diodes." DOE Lighting Program www.ssl.energy.gov 3 | Solid-State Lighting Program SSL Energy Saving Potential By 2030: * Potential to cut U.S. lighting electricity use by 25% * Cumulative energy savings: $120 billion * Annual energy savings equivalent to:

71

White light emitting diode as liquid crystal display backlight  

E-Print Network (OSTI)

The discovery of high brightness (white) light emitting diode (LED) is considered as a real threat to the current lighting industry in various applications. One of the most promising sectors would be using white LED to ...

Soon, Chian Myau

2007-01-01T23:59:59.000Z

72

Solid-State Lighting: Using LEDs  

NLE Websites -- All DOE Office Websites (Extended Search)

Using LEDs to someone by E-mail Using LEDs to someone by E-mail Share Solid-State Lighting: Using LEDs on Facebook Tweet about Solid-State Lighting: Using LEDs on Twitter Bookmark Solid-State Lighting: Using LEDs on Google Bookmark Solid-State Lighting: Using LEDs on Delicious Rank Solid-State Lighting: Using LEDs on Digg Find More places to share Solid-State Lighting: Using LEDs on AddThis.com... Why SSL LED Basics OLED Basics Using LEDs R&D Challenges Market Challenges Using LEDs Resources Using LEDs to Their Best Advantage PDF Establishing LED Equivalency PDF LED Directional Lamps LED MR16 Lamps Recessed LED Downlights PDF General Service LED Lamps What to Ask - A Checklist for Buyers of LED Lighting Products More Resources With their unique design and performance characteristics-such as directional light emission, compact profile, superior optical control,

73

Implementation of Double Pulse Width Modulation for Uniformity of LED Light Bars in LCD Back-Light.  

E-Print Network (OSTI)

??This thesis proposes a dimming approach with Double Pulse Width Modulation for equalizing the light output of the back light with light emitted diodes (LEDs)… (more)

Huang, Chao-Hsuan

2011-01-01T23:59:59.000Z

74

Save Energy, Money and Prevent Pollution with Light-Emitting...  

NLE Websites -- All DOE Office Websites (Extended Search)

Save Energy, Money and Prevent Pollution with Light-Emitting Diode (LED) Exit Signs Secondary menu About us Press room Contact Us Portfolio Manager Login Facility owners and...

75

High power flip-chip light emitting diode.  

E-Print Network (OSTI)

??xiv, 74 leaves : ill. (some col.) ; 30 cm HKUST Call Number: Thesis ELEC 2004 Lai Recently, Light-emitting diodes (LEDs) are widely used in… (more)

Lai, Yin Hing

2004-01-01T23:59:59.000Z

76

Junction temperature measurement of light emitting diode by electroluminescence  

Science Conference Proceedings (OSTI)

Junction temperature (JT) is a key parameter of the performance and lifetime of light emitting diodes(LEDs). In this paper

S. M. He; X. D. Luo; B. Zhang; L. Fu; L. W. Cheng; J. B. Wang; W. Lu

2011-01-01T23:59:59.000Z

77

Shelf life of five meat products displayed under light emitting diode or fluorescent lighting.  

E-Print Network (OSTI)

??Light emitting diode (LED) and fluorescent (FLS) lighting effects on enhanced pork loin chops, beef longissimus dorsi and semimembranosus steaks, ground beef, and ground turkey… (more)

Steele, Kyle Stover

2011-01-01T23:59:59.000Z

78

Which LED Lighting Products Would You Consider Trying? | Department of  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Which LED Lighting Products Would You Consider Trying? Which LED Lighting Products Would You Consider Trying? Which LED Lighting Products Would You Consider Trying? August 5, 2010 - 7:30am Addthis On Monday, Chris discussed his upcoming project to replace the lighting in his kitchen and family room. Chris is considering LED (light-emitting diode) lighting, especially for his kitchen, where they can be installed under the cabinets. LEDs can also be used for other applications, including task lighting, recessed downlights, and holiday lighting. Which LED lighting products would you consider trying? Or, if you're already using LEDs, what do you think of them? Each Thursday, you have the chance to share your thoughts on a question about energy efficiency or renewable energy for consumers. Please comment with your answers, and also feel free to respond to other comments.

79

Solid-State Lighting: Text-Alternative Version: Dimming LEDs...  

NLE Websites -- All DOE Office Websites (Extended Search)

So you need to pay careful attention to any time where the current is zero in a light emitting diode. So I already mentioned LEDs typically need what's called a driver. And the...

80

Energy_Savings_Light_Emitting_Diodes_Niche_Lighting_Apps.pdf...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

EnergySavingsLightEmittingDiodesNicheLightingApps.pdf EnergySavingsLightEmittingDiodesNicheLightingApps.pdf EnergySavingsLightEmittingDiodesNicheLightingApps.p...

Note: This page contains sample records for the topic "led light emitting" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Solid-State Lighting: Webcast: Evaluating LED Street Lighting...  

NLE Websites -- All DOE Office Websites (Extended Search)

Webcast: Evaluating LED Street Lighting Solutions to someone by E-mail Share Solid-State Lighting: Webcast: Evaluating LED Street Lighting Solutions on Facebook Tweet about...

82

Have You Used LED Lighting? Tell Us About It. | Department of...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

It. May 7, 2009 - 5:00am Addthis This week, John shared his experiences with light-emitting diode (LED) lighting. In a future blog, he'll share more about LED lighting. Have you...

83

Proton damage effects on light emitting diodes  

SciTech Connect

We have studied the effects of 16-MeV proton irradiation on the performance of a variety of light emitting diodes (LED's) emitting between 820 and 1300 nm. Total light output and current were measured at room temperature as a function of forward bias prior to and following a sequence of room temperature 16-MeV proton irradiations. Our results indicate that the relative amount of proton-induced degradation from one LED type to another is similar to that observed for neutron and gamma irradiations. More specifically, the most sensitive device is the amphoterically Si-doped GaAs LED which is characterized by a long preirradiation minority carrier lifetime. The most resistant LEDs are the high radiance GaAlAs (820 nm) and InGaAsP (1300 nm) LEDs. As in the case of Si devices, the degradation rate per irradiating particle fluence is significantly greater for proton irradiation of these LEDs than it is for neutron exposure. Neutron damage data presented herein indicate that the ratio of proton-to-neutron degradation rates can be as high as 100. Lifetime-damage constant products for constant current operation are calculated for each LED type and vary from 1.5 x 10/sup -13/ cm/sup 2//p for the InGaAsP LED to 1.1 x 10/sup -10/ cm/sup 2//p for the amphoterically Si-doped GaAs LED.

Rose, B.H.; Barnes, C.E.

1982-03-01T23:59:59.000Z

84

Resonant Power MOSFET Driver for LED Lighting.  

E-Print Network (OSTI)

??LED lighting has a promising future in consumer markets. Many researchers have conducted researches to improve the LED driver efficiencies. In this thesis, a computer… (more)

Tuladhar, Looja R.

2009-01-01T23:59:59.000Z

85

Lighting Group: Sources and Ballasts: LED Reflector Lamp  

NLE Websites -- All DOE Office Websites (Extended Search)

LED Reflector Lamp LED Reflector Lamp LED Reflector Lamp Objective LED reflector lamp The goal of this project is to develop a revolutionary new reflector lamp which offers many advantages over current incandescent reflector lamps, including: three times greater efficiency ten times the rated life greater optical and performance properties use of light emitting diodes (LEDs) to generate the light. Although LEDs have been commercially available since the late 1960Â’s, recent dramatic improvements in LED technology have led to white light devices with efficiencies that meet or exceed those of a standard incandescent lamp. This project will build upon these improvements to develop a new type of source for focusing light. Contact Information For more information on this project, please contact:

86

Wire-shaped semiconductor light-emitting diodes for general-purpose lighting  

SciTech Connect

The object of this work is to develop and optimize a new type of light-emitting diode (LED) with a wire-shaped, cylindrical geometry.

Mauk, Michael G.

2002-10-28T23:59:59.000Z

87

Save Money with LED Holiday Light Strings | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Money with LED Holiday Light Strings Money with LED Holiday Light Strings Save Money with LED Holiday Light Strings December 1, 2009 - 11:19am Addthis Allison Casey Senior Communicator, NREL It's hard to believe, but the holidays are in full swing and many of you are starting to decorate your homes. Those of you who started around Halloween are probably feeling pretty smart because you got your decorating done while the weather was nice. I see you there, snacking on your Thanksgiving leftovers, laughing at me shivering in the cold and struggling to undo the knot in my lights. Don't look so smug. Those of us who haven't started decorating yet may actually be the smart ones this year, because we still have a chance to buy LED light strings. LED (or light emitting diode) light strings can use 90% less energy than

88

Solid-State Lighting: LED Basics  

NLE Websites -- All DOE Office Websites (Extended Search)

SSL Basics Printable Version Share this resource Send a link to Solid-State Lighting: LED Basics to someone by E-mail Share Solid-State Lighting: LED Basics on Facebook Tweet...

89

UV LED lighting for automated crystal centring  

E-Print Network (OSTI)

A direct outcome of the exponential growth of macromolecular crystallography is the continuously increasing demand for synchrotron beam time, both from academic and industrial users. As more and more projects entail screening a profusion of sample crystals, fully automated procedures at every level of the experiments are being implemented at all synchrotron facilities. One of the major obstacles to achieving such automation lies in the sample recognition and centring in the X-ray beam. The capacity of UV light to specifically react with aromatic residues present in proteins or with DNA base pairs is at the basis of UV-assisted crystal centring. Although very efficient, a well known side effect of illuminating biological samples with strong UV sources is the damage induced on the irradiated samples. In the present study the effectiveness of a softer UV light for crystal centring by taking advantage of low-power light-emitting diode (LED) sources has been investigated. The use of UV LEDs represents a lowcost solution for crystal centring with high specificity.

Leonard M. G. Chavas; Yusuke Yamada; Masahiko Hiraki; Noriyuki Igarashi; Naohiro Matsugaki; Soichi Wakatsuki

2010-01-01T23:59:59.000Z

90

INVESTIGATION OF OPTICAL STRUCTURES FOR ENHANCING THE LIGHT EXTRACTION FICIENCY OF WHITE LED.  

E-Print Network (OSTI)

??Recently, phosphor-conversion has been widely used in producing white light-emitting diodes (LEDs). In phosphor-converted (pc) LEDs, the blue LED chip is surrounded by the phosphor… (more)

Chen, Wei-Liang

2009-01-01T23:59:59.000Z

91

Keeping Pace with LED Lighting Trends | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Keeping Pace with LED Lighting Trends Keeping Pace with LED Lighting Trends Keeping Pace with LED Lighting Trends October 23, 2013 - 10:41am Addthis This year's SSL Market Introduction Workshop will take place in Portland, Oregon. | Photo courtesy of Travel Portland This year's SSL Market Introduction Workshop will take place in Portland, Oregon. | Photo courtesy of Travel Portland Jim Brodrick Lighting Program Manager Rapid advances in solid-state lighting (SSL) technology are reducing the cost, improving the performance and quality, and bringing new lighting options--light emitting diodes (LEDs) to the market. But for lighting and energy efficiency industry professionals this seemingly good news can be "too much of a good thing." Imagine the challenge of making smart institutional purchasing decisions or designing

92

LEDs  

NLE Websites -- All DOE Office Websites (Extended Search)

Biomedical devices from ultraviolet Biomedical devices from ultraviolet LEDs February 24, 2012 LEDs produce light in the ultraviolet range A process for creating glass-based, inorganic light-emitting diodes (LEDs) that produce light in the ultraviolet range has been developed by a multinational team of scientists. The work, reported in the online Nature Communications, is a step toward biomedical devices with active components made from nanostructured systems. Solution-processed inorganic nanocrystals hold promise LEDs based on solution-processed inorganic nanocrystals have promise for use in environmental and biomedical diagnostics because they are cheap to produce, - 2 - robust, and chemically stable. But development has been hampered by the difficulty of achieving ultraviolet emission. In their paper, LANL's Sergio Brovelli and a research team lead by Alberto Paleari at the

93

IntenCity - 2 Solid State Outdoor Luminaire SL-3200 High Output LED Street Light  

Science Conference Proceedings (OSTI)

The product under assessment is an advanced lighting technology8212a solid state outdoor luminarie light emitting diode (LED) street lighting system designed to provide various levels of direct white light.

2008-06-12T23:59:59.000Z

94

LED Traffic Light as a Communications Device Grantham Pang, Thomas Kwan, Chi-Ho Chan, Hugh Liu.  

E-Print Network (OSTI)

:http://www.eee.hku.hk/~gpang Abstract The visible light from an LED (light emitting diode) traffic light can be modulated and encoded on the description of an audio information system made up of high brightness, visible light emitting diodes (LEDs messages 1. Introduction Recently, high intensity light emitting diodes for traffic signals are available

Pang, Grantham

95

Pousset, Obein, Razet, LED lighting quality with CQS samples CIE 2010 : Lighting Quality and Energy Efficiency, 14-17 March 2010, Vienna, Austria 1  

E-Print Network (OSTI)

A psychophysical experiment developed to evaluate light quality of Light Emitting Diodes (LEDs) is described. Keywords: Light Emitting Diode, quality of light, Color Rendering Index, Color Quality Scale, visual

Paris-Sud XI, Université de

96

GaN light-emitting diodes with Archimedean lattice photonic crystals Aurlien David,a  

E-Print Network (OSTI)

GaN light-emitting diodes with Archimedean lattice photonic crystals Aurélien David,a Tetsuo Fujii 2005; published online 16 February 2006 We study GaN-based light emitting diodes incorporating light- emitting diodes LEDs , as they could extract the emitted light otherwise trapped inside

Recanati, Catherine

97

Core/Shell Nanophosphors for LED Lighting  

Science Conference Proceedings (OSTI)

Symposium, Symposium H: Advanced Ceramics. Presentation Title, Core/Shell Nanophosphors for LED Lighting. Author(s), Jinkyu Han, Gustavo Hirata, Jan B ...

98

Psychophysical evaluations of modulated color rendering for energy performance of LED-based architectural lighting  

E-Print Network (OSTI)

This thesis is focused on the visual perception evaluation of colors within an environment of a highly automated lighting control strategy. Digitally controlled lighting systems equipped with light emitting diodes, LEDs, ...

Thompson, Maria do Rosário

2007-01-01T23:59:59.000Z

99

A description and evaluation of light-emitting diode displays for generation of visual stimuli*  

E-Print Network (OSTI)

A description and evaluation of light-emitting diode displays for generation of visual stimuli 53706 A description of the design and function of light-emitting diode (LED) display modules is given (Time, April 1972). Light-emitting diodes (L~Ds) are examples of these spin-offs, LED display devices

Massaro, Dominic

100

Confocal microphotoluminescence of InGaN-based light-emitting diodes Koichi Okamoto,a  

E-Print Network (OSTI)

for conventional incandescent and fluorescent light bulbs.5 However, luminous efficacies of commercial white LEDsConfocal microphotoluminescence of InGaN-based light-emitting diodes Koichi Okamoto,a Akio Kaneta-well-structured light-emitting diodes LEDs with a yellow-green light 530 nm and an amber light 600 nm was measured

Okamoto, Koichi

Note: This page contains sample records for the topic "led light emitting" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

Commercial Lighting and LED Lighting Incentives (Vermont) | Open...  

Open Energy Info (EERE)

form History Share this page on Facebook icon Twitter icon Commercial Lighting and LED Lighting Incentives (Vermont) This is the approved revision of this page, as well as...

102

Evaluation of potential applications for templated arrays of heterostructural semiconductor nanowires as light emitting devices  

E-Print Network (OSTI)

While light emitting devices, such as laser diodes (LDs) and light emitting diodes (LEDs), were first introduced decades ago, they have been the subject of continuing research and improvements due to their relatively poor ...

Zou, Ting, M. Eng. Massachusetts Institute of Technology

2006-01-01T23:59:59.000Z

103

Multispectral imaging of the ocular fundus using light emitting diode illumination  

E-Print Network (OSTI)

Multispectral imaging of the ocular fundus using light emitting diode illumination N. L. Everdell,1 on light emitting diode LED illumination that produces multispectral optical images of the human ocular

Claridge, Ela

104

Nanofabrication of gallium nitride photonic crystal light-emitting diodes  

Science Conference Proceedings (OSTI)

We describe a comparison of nanofabrication technologies for the fabrication of 2D photonic crystal structures on GaN/InGaN blue LEDs. Such devices exhibit enhanced brightness and the possibility of controlling the angular emission profile of emitted ... Keywords: GaN dry-etching, Light-emitting diodes, Nanolithography, Photonic crystals

Ali Z. Khokhar; Keith Parsons; Graham Hubbard; Faiz Rahman; Douglas S. Macintyre; Chang Xiong; David Massoubre; Zheng Gong; Nigel P. Johnson; Richard M. De La Rue; Ian M. Watson; Erdan Gu; Martin D. Dawson; Steve J. Abbott; Martin D. B. Charlton; Martin Tillin

2010-11-01T23:59:59.000Z

105

Power saving regulated light emitting diode circuit  

SciTech Connect

A power saving regulated light source circuit, comprising a light emitting diode (LED), a direct current source and a switching transistor connected in series with the LED, a control voltage producing resistor connected in series with the LED to produce a control voltage corresponding to the current through the LED, a storage capacitor connected in parallel with the series combination of the LED and the resistor, a comparator having its output connected to the input of the transistor, the comparator having a reference input and a control input, a stabilized biasing source for supplying a stabilized reference voltage to the reference input, the control input of the comparator being connected to the control voltage producing resistor, the comparator having a high output state when the reference voltage exceeds the control voltage while having a low output state when the control voltage exceeds the reference voltage, the transistor being conductive in response to the high state while being nonconductive in response to the low state, the transistor when conductive being effective to charge the capacitor and to increase the control voltage, whereby the comparator is cycled between the high and low output states while the transistor is cycled between conductive and nonconductive states.

Haville, G. D.

1985-03-12T23:59:59.000Z

106

Solid-State Lighting: Municipal Consortium LED Street Lighting Workshop  

NLE Websites -- All DOE Office Websites (Extended Search)

Los Angeles, CA to someone Los Angeles, CA to someone by E-mail Share Solid-State Lighting: Municipal Consortium LED Street Lighting Workshop Presentations and Materials-Los Angeles, CA on Facebook Tweet about Solid-State Lighting: Municipal Consortium LED Street Lighting Workshop Presentations and Materials-Los Angeles, CA on Twitter Bookmark Solid-State Lighting: Municipal Consortium LED Street Lighting Workshop Presentations and Materials-Los Angeles, CA on Google Bookmark Solid-State Lighting: Municipal Consortium LED Street Lighting Workshop Presentations and Materials-Los Angeles, CA on Delicious Rank Solid-State Lighting: Municipal Consortium LED Street Lighting Workshop Presentations and Materials-Los Angeles, CA on Digg Find More places to share Solid-State Lighting: Municipal Consortium

107

Highly Efficient Silicon Light Emitting Diode  

E-Print Network (OSTI)

In this paper, we describe the fabrication, using standard silicon processing techniques, of silicon light-emitting diodes (LED) that efficiently emit photons with energy around the silicon bandgap. The improved efficiency had been explained by the spatial confinement of charge carriers due to a local strain field that is formed by dislocation loop arrays. The dependence of device electroluminescent properties on the annealing conditions is carefully examined as a high temperature process has profound influence on these dislocations. Increased luminescent intensity at higher device temperature, together with pure diffusion current conduction mechanism evidently shows the influence of the dislocation loops. The electrical properties of the diode are reasonable with low leakage reverse current.

Leminh Holleman Wallinga; P. Leminh; J. Holleman; H. Wallinga

2000-01-01T23:59:59.000Z

108

A strategy for the use of light emitting diodes by autonomous underwater vehicles  

E-Print Network (OSTI)

Light Emitting Diode (LED) technology has advanced dramatically in a few short years. An expensive and difficult to manufacture LED array containing nearly 100 individual LEDs and measuring at least 5 cm˛ can now be replaced ...

Curran, Joseph R. (Joseph Robinson)

2004-01-01T23:59:59.000Z

109

Resonant energy transfer in light harvesting and light emitting applications.  

E-Print Network (OSTI)

??The performance of light emitting and light harvesting devices is improved by utilising resonant energy transfer. In lighting applications, the emission energy of a semiconductor… (more)

Chanyawadee, Soontorn

2009-01-01T23:59:59.000Z

110

spectroscopic techniques A Multi-Source Portable Light Emitting Diode Spectrofluorometer  

E-Print Network (OSTI)

spectroscopic techniques A Multi-Source Portable Light Emitting Diode Spectrofluorometer SAFWAN only 1.5 kg that uses multiple light emitting diodes (LEDs) as excitation sources was developed emitting diodes; LEDs; Animal forage; Excitation-emission matrices; EEM. INTRODUCTION Movement of chemical

111

Photonic-crystal GaN light-emitting diodes with tailored guided modes distribution  

E-Print Network (OSTI)

Photonic-crystal GaN light-emitting diodes with tailored guided modes distribution Aurélien David of photonic crystal PhC -assisted gallium nitride light-emitting diodes LEDs to the existence of unextracted a promising but challenging solution towards efficient solid-state lighting. Conventional GaN-based light-emitting

Recanati, Catherine

112

Developing quantum dot phosphor-based light-emitting diodes for aviation lighting applications  

Science Conference Proceedings (OSTI)

We have investigated the feasibility of employing quantum dot (QD) phosphor-based light-emitting diodes (LEDs) in aviation applications that request Night Vision Imaging Systems (NVIS) compliance. Our studies suggest that the emerging QD phosphorbased ...

Fengbing Wu; Dawei Zhang; Shuzhen Shang; Yiming Zhu; Songlin Zhuang; Jian Xu

2012-01-01T23:59:59.000Z

113

Solid-State Lighting: Municipal Consortium LED Street Lighting...  

NLE Websites -- All DOE Office Websites (Extended Search)

Boston, MA to someone by E-mail Share Solid-State Lighting: Municipal Consortium LED Street Lighting Workshop Presentations and Materials-Boston, MA on Facebook Tweet about...

114

Solid-State Lighting: Municipal Consortium LED Street Lighting...  

NLE Websites -- All DOE Office Websites (Extended Search)

Dallas, TX to someone by E-mail Share Solid-State Lighting: Municipal Consortium LED Street Lighting Workshop Presentations and Materials-Dallas, TX on Facebook Tweet about...

115

Vertical Pillar-Superlattice Array and Graphene Hybrid Light Emitting Diodes  

E-Print Network (OSTI)

Vertical Pillar-Superlattice Array and Graphene Hybrid Light Emitting Diodes Jung Min Lee, Jae a class of light emitting diode (LED) with interesting mechanical, optical, and electrical characteristics, light-emitting diodes, 3D architectures, transparent electrodes V ertical arrays of one-dimensional (1D

Rogers, John A.

116

Loss of Quantum Efficiency in Green Light Emitting Diode Dies at Low Temperature  

E-Print Network (OSTI)

Loss of Quantum Efficiency in Green Light Emitting Diode Dies at Low Temperature Yufeng Li1,2 , Wei, photoluminescence and cathodoluminescence of GaInN/GaN multiple quantum well light emitting diode dies are analyzed and efficient pure green light emitting diodes (LEDs) are of high economic value. However, when the emission

Wetzel, Christian M.

117

Development of high power green light emitting diode dies in piezoelectric GaInN/GaN  

E-Print Network (OSTI)

Development of high power green light emitting diode dies in piezoelectric GaInN/GaN Christian in green light emitting diodes is one of the big challenges towards all-solid- state lighting. The prime,3], and commercialization [4,5] of high brightness light emitting diodes LEDs has led to a 1.82 Billion-$/year world market

Detchprohm, Theeradetch

118

Journal of Light Emitting Diodes Vol 2 N0 1, April 2010 1 Abstract--Semiconductor nanocrystal quantum dots (NQD)  

E-Print Network (OSTI)

Journal of Light Emitting Diodes Vol 2 N0 1, April 2010 1 Abstract-- Semiconductor nanocrystal convertors integrated on light-emitting diodes (LEDs). The use of nonradiative energy transfer, also known-LEDs for lighting applications. Index Terms-- Förster resonance energy transfer, light emitting diode, nanocrystal

Demir, Hilmi Volkan

119

Light emitting device having peripheral emissive region  

DOE Patents (OSTI)

Light emitting devices are provided that include one or more OLEDs disposed only on a peripheral region of the substrate. An OLED may be disposed only on a peripheral region of a substantially transparent substrate and configured to emit light into the substrate. Another surface of the substrate may be roughened or include other features to outcouple light from the substrate. The edges of the substrate may be beveled and/or reflective. The area of the OLED(s) may be relatively small compared to the substrate surface area through which light is emitted from the device. One or more OLEDs also or alternatively may be disposed on an edge of the substrate about perpendicular to the surface of the substrate through which light is emitted, such that they emit light into the substrate. A mode expanding region may be included between each such OLED and the substrate.

Forrest, Stephen R

2013-05-28T23:59:59.000Z

120

LED traffic lights: New technology signals major energy savings  

SciTech Connect

Using light-emitting diode technology to replace incandescent lamps in traffic signals promises energy savings upwards of 60 percent for each of the estimated quarter of a million controlled intersections in the United States. LED units use only 9 to 25 watts instead of the 67 to 150 watts used by each incandescent lamp. Though their first cost is relatively high, energy savings result in paybacks of 1 to 5 years. LED retrofit kits are available for red signal disks and arrows, and installations in several states have proven successful, although minor improvements are addressing concerns about varying light output and controller circuitry. Retrofitting green lamps is not yet feasible, because color standards of the Institute of Traffic Engineers cannot be met with existing LED technology. Yellow lamps have such low duty factors (they`re on only 3 percent of the time) that retrofitting with LED signals is not cost-effective. LEDs last much longer than incandescents, allowing municipalities to not only reduce their electricity bills, but to save on maintenance costs as well. As further incentive, some utilities are beginning to implement rebate programs for LED traffic signal retrofits. Full approval of LED units is still awaited from the Institute of Traffic Engineers (ITE), the standard-setting body for traffic safety devices. Local and state governments ultimately decide what specifications to require for traffic lights, and the growing body of successful field experience with LEDs appears to be raising their comfort level with the technology. The California Department of Transportation is developing an LED traffic light specification, and two California utilities, Southern California Edison and Pacific Gas and Electric, have provided rebates for some pilot installations.

Houghton, D.

1994-12-31T23:59:59.000Z

Note: This page contains sample records for the topic "led light emitting" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Sustainable LED Fluorescent Light Replacement Technology  

SciTech Connect

Ilumisys and the National Center for Manufacturing Sciences (NCMS) partnered on a three-year project awarded by the United States (U.S.) Department of Energy (DOE), to quantify the impacts of LED lamps, incandescent lamps and fluorescent benchmark lamps over a product lifecycle – i.e. to develop a sustainable design and manufacturing strategy that addresses product manufacturing, use, recycling and disposal scenarios for LED-based lighting. Based on the knowledge gained from extensive product tear-down studies of fluorescent and screw-in lighting products, lifecycle assessment tools, and accelerated lifecycle testing protocols, an interactive Sustainable LED Design Guide has been developed to aid architectural and lighting designers and engineers in making design decisions that consider three important environmental impacts (greenhouse gas emissions, energy use and mercury emission) across all phases of the life of an LED lighting product. Critical information developed for the lifecycle analysis and product feature comparisons is the useful life of the lighting product as well as its performance. The Design Guide is available at www.ncms.org, and was developed based on operational and durability testing of a variety of lighting products including power consumption, light output, and useful life of a lamp in order to allow a more realistic comparison of lamp designs. This report describes the main project tasks, results and innovative features of the lifecycle assessment (LCA)-based design tools, and the key considerations driving the sustainable design of LED lighting systems. The Design Guide incorporates the following three novel features for efficiently evaluating LED lighting features in value-chains: • Bill-of-Materials (BOM) Builder – Designers may import process data for each component and supply functional data for the product, including power, consumption, lumen output and expected useful life. • Environmental Impact Review – Designs are comparable across lifecycle phases, subsystems, and environmental impact category, and can be normalized to a userdefined functional unit. • Drill-down Review – These provide an indepth look at individual lamp designs with the ability to review across subsystem or lifecycle phase.

None

2011-06-30T23:59:59.000Z

122

Energy Savings Estimates of Light Emitting Diodes in Niche Lighting Applications  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Savings Estimates of Light Emitting Diodes Savings Estimates of Light Emitting Diodes in Niche Lighting Applications Prepared for: Building Technologies Program Office of Energy Efficiency and Renewable Energy U.S. Department of Energy Prepared by: Navigant Consulting Inc. 1801 K Street, NW Suite 500 Washington DC, 20006 September 2008 * Department of Energy Washington, DC 20585 Energy Savings Estimates of Light Emitting Diodes in Niche Lighting Applications Released: September 2008 Revised: October 2008 This DOE report presents research findings for twelve different niche markets where LEDs are competing or poised to compete with traditional light sources (e.g., incandescent and fluorescent). Estimates of the energy saved due to current levels of LED market penetration as well as estimates of potential energy savings if these markets switched completely to LEDs

123

Green Light-Emitting Diode Makes Highly Efficient White Light, The Spectrum of Clean Energy Innovation (Fact Sheet)  

NLE Websites -- All DOE Office Websites (Extended Search)

Spectrum of Spectrum of Clean Energy Innovation innovati n Green Light-Emitting Diode Makes Highly Efficient White Light Scientists at the National Renewable Energy Laboratory (NREL) have invented a deep green light-emitting diode (LED) that can lead to higher efficiency white light, which is of prime value in the indoor lighting world. LEDs are fundamentally solar cells operating in reverse-that is, when an electrical current is applied to a thin-film semiconductor, the result is the emission of light. These devices are a key technology for producing a new generation of efficient lighting, in which the amount of light generated far outweighs the amount of heat produced. But at the moment, LEDs that emit white light are produced using an inefficient process known as phosphor conversion. In this process, light from a blue- or ultraviolet-emitting LED energizes

124

Light source comprising a common substrate, a first led device and a second led device  

SciTech Connect

At least one stacked organic or polymeric light emitting diode (PLEDs) devices to comprise a light source is disclosed. At least one of the PLEDs includes a patterned cathode which has regions which transmit light. The patterned cathodes enable light emission from the PLEDs to combine together. The light source may be top or bottom emitting or both.

Choong, Vi-En (Carlsbad, CA)

2010-02-23T23:59:59.000Z

125

New and Underutilized Technology: Airfield LED Lighting | Department of  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Technology: Airfield LED Lighting Technology: Airfield LED Lighting New and Underutilized Technology: Airfield LED Lighting October 7, 2013 - 8:57am Addthis The following information outlines key deployment considerations for airfield LED lighting within the Federal sector. Benefits Airfield LED lighting is a good application for colored LED lights since the LED is monochromatic. Reduced maintenance costs dramatically improve economics over existing incandescent. Application Airfield LED lighting is applicable at airports as wells military and domestic air stations and bases. Key Factors for Deployment Federal agencies must determine Federal Aviation Administration (FAA) approval requirements before deployment. Ranking Criteria Federal energy savings, cost-effectiveness, and probability of success are

126

Efficiency enhancement in a light-emitting diode with a two-dimensional surface grating photonic crystal  

E-Print Network (OSTI)

Efficiency enhancement in a light-emitting diode with a two-dimensional surface grating photonic 21 November 2003 We demonstrate a light-emitting diode exhibiting 1.7­2.7-fold enhancement in light light emitting diode LED , the ef- ficiency is limited to several percents by a low light extrac- tion

Baba, Toshihiko

127

High efficiency III-nitride light-emitting diodes  

DOE Patents (OSTI)

Tailored doping of barrier layers enables balancing of the radiative recombination among the multiple-quantum-wells in III-Nitride light-emitting diodes. This tailored doping enables more symmetric carrier transport and uniform carrier distribution which help to reduce electron leakage and thus reduce the efficiency droop in high-power III-Nitride LEDs. Mitigation of the efficiency droop in III-Nitride LEDs may enable the pervasive market penetration of solid-state-lighting technologies in high-power lighting and illumination.

Crawford, Mary; Koleske, Daniel; Cho, Jaehee; Zhu, Di; Noemaun, Ahmed; Schubert, Martin F; Schubert, E. Fred

2013-05-28T23:59:59.000Z

128

Enhanced Light Extraction from Organic Light Emitting Diodes  

Ames Laboratory researchers have developed a soft lithography microlens fabrication and array that enables more efficient organic light emitting diodes (OLEDs), improving their commercial viability.

129

LED Traffic Lights Get Buy American Stamp | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

LED Traffic Lights Get Buy American Stamp LED Traffic Lights Get Buy American Stamp November 30, 2010 - 10:19am Addthis Red. Yellow. Green. What LED traffic signals don't say: Made...

130

Solid-State Lighting: Simple Modular LED Cost Model  

NLE Websites -- All DOE Office Websites (Extended Search)

Simple Modular LED Cost Model to someone by E-mail Share Solid-State Lighting: Simple Modular LED Cost Model on Facebook Tweet about Solid-State Lighting: Simple Modular LED Cost...

131

Blue light emitting thiogallate phosphor  

DOE Patents (OSTI)

A crystalline blue emitting thiogallate phosphor of the formula RGa.sub.2 S.sub.4 :Ce.sub.x where R is selected from the group consisting of calcium, strontium, barium and zinc, and x is from about 1 to 10 atomic percent, the phosphor characterized as having a crystalline microstructure on the size order of from about 100 .ANG. to about 10,000 .ANG. is provided together with a process of preparing a crystalline blue emitting thiogallate phosphor by depositing on a substrate by CVD and resultant thin film electroluminescent devices including a layer of such deposited phosphor on an ordinary glass substrate.

Dye, Robert C. (Los Alamos, NM); Smith, David C. (Los Alamos, NM); King, Christopher N. (Portland, OR); Tuenge, Richard T. (Hillsboro, OR)

1998-01-01T23:59:59.000Z

132

Progress in Organic Light emitting Diodes  

NLE Websites -- All DOE Office Websites (Extended Search)

90-3075 Seminar HostPoint of Contact: Samuel Mao The development of organic light emitting diode (OLED) from its discovery in the Kodak Research Laboratories in the late 1970's...

133

ZnSe light?emitting diodes  

Science Conference Proceedings (OSTI)

We report the successful fabrication of ZnSe p?n junction light?emitting diodes in which Li and Cl are used as p?type and n?type dopants

J. Ren; K. A. Bowers; B. Sneed; D. L. Dreifus; J. W. Cook Jr.; J. F. Schetzina; R. M. Kolbas

1990-01-01T23:59:59.000Z

134

Fabrication and optimization of light emitting devices with core-shell quantum dots  

E-Print Network (OSTI)

Quantum dot light emitting devices (QD-LEDs) are promising options for the next generation of solid state lighting, color displays, and other optoelectronic applications. Overcoating quantum dots (QDs) -- semiconducting ...

Song, Katherine Wei

2013-01-01T23:59:59.000Z

135

Efficiency loss mechanisms in colloidal quantum-dot light-emitting diodes  

E-Print Network (OSTI)

Saturated and tunable emission colors make colloidal quantum-dot light-emitting diodes (QD-LEDs) interesting for the next generation of display and lighting technologies. However, there still remain various hurdles to the ...

Shirasaki, Yasuhiro

2013-01-01T23:59:59.000Z

136

LIGHT EMITTING DlODE TESTING AND ANALYSIS  

SciTech Connect

This report covers the work done to analyze the optical output of a Light Emitting Diode. This diode consists' of a Monsanto MV2 LED chip in an MV50 package. A calculator based instrumentation system is described including programming techniques used to reduce and display data. A Light Instrumentation System with specially designed fiber optic cables is described which gathers data for processing by the calculator based instrumentation system. Future work will include analysis of the RCA 8571 Photomultiplier Tube.

Bowers, J L; Allen, T E

1973-08-01T23:59:59.000Z

137

Photochemistry of Organic Light?Emitting Diodes  

Science Conference Proceedings (OSTI)

The optical properties and excited?state geometries of some organic light?emitting diodes have been investigated by the SAC?CI method. The absorption and emission spectra have been predicted in high accuracy and the chain?length dependence of transition energies has been precisely reproduced. The present study provides the useful basis for the theoretical design predicting the photo?physical properties of the organic light?emitting diodes.

Masahiro Ehara; Hiroshi Nakatsuji

2007-01-01T23:59:59.000Z

138

Getting Ready for LEDs: LED Lighting Video Series Explains the Basics |  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

for LEDs: LED Lighting Video Series Explains the for LEDs: LED Lighting Video Series Explains the Basics Getting Ready for LEDs: LED Lighting Video Series Explains the Basics November 26, 2012 - 3:09pm Addthis Part 1 of the ElectricTV.net video series. Part 2 of the ElectricTV.net video series. Roland Risser Roland Risser Program Director, Building Technologies Office How can I participate? Learn more about the advantages and accessiblity of LED lighting from this series of videos. If you haven't been down the lighting aisle of your favorite home improvement store lately, you may be surprised at how many LED lighting products have arrived. Solid-state lighting (LEDs are one type) will soon have a strong impact on how buildings and homes are lit, in part because of its potential to reduce U.S. lighting energy usage by nearly one half.

139

Blue light emitting diode internal and injection efficiency  

Science Conference Proceedings (OSTI)

A simple experimental method of light emitting diode(LED) injection efficiency (IE) determination was suggested. IE and internal quantum efficiency(IQE) calculation is an actual and difficult problem in LED science. In this paper IE and IQE of blue LEDs were determined separately. The method is based on electroluminescence data fitting by the modified rate equation model. Efficiency droop caused by Auger recombination and poor injection were taken into account. Only one reasonable assumption was accepted during the calculations: IE tends to 1 at low current densities.

Ilya E. Titkov; Denis A. Sannikov; Young-Min Park; Joong-Kon Son

2012-01-01T23:59:59.000Z

140

Demonstration of LED Street Lighting in Kansas City, MO  

SciTech Connect

Nine different streetlighting products were installed on various streets in Kansas City, Missouri during February, 2011, to evaluate their performance relative to the incumbent high-pressure sodium (HPS) lighting. The applications investigated included 100 W, 150 W, 250 W, and 400 W HPS installations. Initial measurements and comparisons included power, illuminance, and luminance; sample illuminance readings have continued at each of the nine locations at roughly 1,000-hour operating intervals since then. All of the LED products consumed less power than their HPS counterparts—with a mean difference of 39% and a range of 31% to 51%—but they also emitted 31% fewer lumens, on average. The net result is just a 15% increase in mean efficacy. Applying the city’s stringent light loss factors to the initial measured data meant that five of the LED products (and two of the HPS luminaires) were predicted to eventually fail to meet the specified mean illuminance over their lifetimes; however, the specified light loss levels are not expected to be reached by the LED products until some distant future date (between 12 and 30 years after installation according to manufacturer specification sheet estimates). The practical value of designing streetlighting systems to meet illumination requirements more than 15 years in the future is questioned. Numerous sources of variation in field measurements are noted throughout the report, particularly seasonal influences such as ambient temperature and foliage that are evident in the time-series illuminance data.

Kinzey, Bruce R.; Royer, Michael P.; Hadjian, M.; Kauffman, Rick

2013-06-10T23:59:59.000Z

Note: This page contains sample records for the topic "led light emitting" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Solid-State Lighting: Model Specification for LED Roadway Luminaires...  

NLE Websites -- All DOE Office Websites (Extended Search)

Model Specification for LED Roadway Luminaires Webcast to someone by E-mail Share Solid-State Lighting: Model Specification for LED Roadway Luminaires Webcast on Facebook Tweet...

142

Solid-State Lighting: Successful Selection of LED Streetlight...  

NLE Websites -- All DOE Office Websites (Extended Search)

Successful Selection of LED Streetlight Luminaires: Optimizing Illumination and Economic Performance to someone by E-mail Share Solid-State Lighting: Successful Selection of LED...

143

Information Resources: LED Site Lighting in the Commercial Building...  

NLE Websites -- All DOE Office Websites (Extended Search)

the Commercial Building Energy Alliances' (CBEA) efforts to explore the viability of LED site lighting in commercial parking lots. LED technology has the potential for...

144

Design and fabrication of high-index-contrast self-assembled texture for light extraction enhancement in LEDs  

E-Print Network (OSTI)

We developed a high-index-contrast photonic structure for improving the light extraction efficiency of light-emitting diodes (LEDs) by a self-assembly approach. In this approach, a two-dimensional grating can be ...

Sheng, Xing

145

Measured Off-Grid LED Lighting System Performance  

E-Print Network (OSTI)

Market in Western Kenya: LED Alternatives and Consumerfor Emerging Off-grid White-LED Illumination Systems forReport #4 Measured Off-Grid LED Lighting System Performance

Granderson, Jessica

2009-01-01T23:59:59.000Z

146

New and Underutilized Technology: Interior LED/Solid State Lighting |  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Interior LED/Solid State Lighting Interior LED/Solid State Lighting New and Underutilized Technology: Interior LED/Solid State Lighting October 4, 2013 - 4:53pm Addthis The following information outlines key deployment considerations for interior LED/solid state lighting within the Federal sector. Benefits Interior LED retrofits are currently viable for down lights, track lighting, sconces, and both line and low voltage task lighting. Replacements for incandescent A-lamps have also been improving rapidly. Replacements for fluorescent tube lighting may be viable for high-cost maintenance areas. Application Interior LED/solid state lighting is a rapidly improving technology currently most applicable for down lights, track lights, task lighting, accenting, high ceiling, and high cost maintenance areas.

147

New and Underutilized Technology: Exterior LED/Solid State Lighting |  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Exterior LED/Solid State Lighting Exterior LED/Solid State Lighting New and Underutilized Technology: Exterior LED/Solid State Lighting October 4, 2013 - 4:55pm Addthis The following information outlines key deployment considerations for exterior LED/solid state lighting within the Federal sector. Benefits LED lighting economics can work in high electric cost areas with high hours of use. Pricing continually decreases for LED lighting. This technology provides quality, white, even lighting with good color rendition. Greater cost savings can be achieved when combined with bi-level motion sensors to reduce light levels in parking areas, garages, and walkways. Application Exterior LED/solid state lighting is applicable in areas where security and visual performance are critical, including street lighting, parking lots,

148

Matrix-addressable III-nitride light emitting diode arrays on silicon substrates by flip-chip technology.  

E-Print Network (OSTI)

??xiv, 81 leaves : ill. ; 30 cm HKUST Call Number: Thesis ECED 2007 Keung Matrix-addressable light emitting diode (LED) micro-arrays on sapphire substrates have… (more)

Keung, Chi Wing

2007-01-01T23:59:59.000Z

149

The Effect of Light Emitting Diode Phototherapy on the Rate of Orthodontic Tooth Movement - A Clinical Study.  

E-Print Network (OSTI)

??Increasing the rate of orthodontic tooth movement (OTM) can reduce risks such as periodontal disease and caries. This study investigated whether light emitting diode (LED)… (more)

Chung, Sean

2013-01-01T23:59:59.000Z

150

NREL: Buildings Research - Brilliant White Light with Amber LEDs...  

NLE Websites -- All DOE Office Websites (Extended Search)

Brilliant White Light with Amber LEDs; NREL Licensing Webinar December 10th November 12, 2013 LED bulbs are the future of lighting for industry, business, and consumers. As the...

151

LED Provides Effective and Efficient Parking Area Lighting at...  

NLE Websites -- All DOE Office Websites (Extended Search)

New LED parking area lights at the NAVFAC Engineering Service Center at Port Hueneme provide high quality, evenly distributed light. Photo courtesy of PNNL because of its long...

152

LED Provides Effective and Efficient Lighting in Freezer Storage  

NLE Websites -- All DOE Office Websites (Extended Search)

by example, saving energy and taxpayer dollars in federal facilities Spotlight on Design LED Provides Effective and Efficient Lighting in Freezer Storage Room New lighting...

153

Effect of carbazoleoxadiazole excited-state complexes on the efficiency of dye-doped light-emitting diodes  

E-Print Network (OSTI)

a profound effect on the external quantum efficiency of dye-doped organic light-emitting diodes employing Institute of Physics. DOI: 10.1063/1.1469692 I. INTRODUCTION Thin-film organic light-emitting diodes LEDsEffect of carbazole­oxadiazole excited-state complexes on the efficiency of dye-doped light-emitting

154

Journal of Crystal Growth 298 (2007) 272275 Dislocation analysis in homoepitaxial GaInN/GaN light emitting  

E-Print Network (OSTI)

of GaInN/GaN-based light emitting diodes (LED) on quasi-bulk GaN with an atomically flat polished were much improved. The optical output power of the light emitting diode increased by more than one. Cathodoluminescence; A1. Threading dislocation density; A2. Homoepitaxial growth; B1. GaInN; B3. Light emitting diode

Wetzel, Christian M.

155

Junction temperature, spectral shift, and efficiency in GaInN-based blue and green light emitting diodes  

E-Print Network (OSTI)

Keywords: GaInN/GaN Light emitting diode temperature Micro-Raman Photoluminescence Electroluminescence well light emitting diode (LED) dies is analyzed by micro-Raman, photoluminescence, cathodoluminescenceJunction temperature, spectral shift, and efficiency in GaInN-based blue and green light emitting

Wetzel, Christian M.

156

Discrete Steps in the Capacitance-Voltage Characteristics of GaInN/GaN Light Emitting Diode Structures  

E-Print Network (OSTI)

Discrete Steps in the Capacitance-Voltage Characteristics of GaInN/GaN Light Emitting Diode and GaInN/GaN heterostructures typically used for high efficiency light emitting diodes is of high materials for green, blue, and UV light emitting diodes (LED) [1-2]. It is known that huge piezoelectric

Wetzel, Christian M.

157

Thickness-dependent changes in the optical properties of PPV-and PF-based polymer light emitting diodes  

E-Print Network (OSTI)

the thickness-dependent optical properties of single layer polymer light emitting diodes for two materials, poly the electronic and optical properties of these materials in light emitting diode LED structures.2 OurThickness-dependent changes in the optical properties of PPV- and PF-based polymer light emitting

Carter, Sue

158

Conference 5739, SPIE International Symposium Integrated Optoelectronic Devices, 22-27 Jan 2005, San Jose, CA Development of high power green light emitting diode dies in  

E-Print Network (OSTI)

, San Jose, CA Development of high power green light emitting diode dies in piezoelectric Ga in green light emitting diodes is one of the big challenges towards all-solid- state lighting. The prime,3], and commercialization [4,5] of high brightness light emitting diodes LEDs has led to a 1.82 Billion-$/year world market

Wetzel, Christian M.

159

Available Technologies: Novel Structured LED and OLED Devices  

APPLICATIONS OF TECHNOLOGY: Light Emitting Diode (LED) and Organic LED devices for. Energy-efficient area lighting ; Information displays

160

Novel Structured LED and OLED Devices - Energy Innovation Portal  

Applications and Industries Light Emitting Diode (LED) and Organic LED devices for. Energy-efficient area lighting; Information displays; Technology ...

Note: This page contains sample records for the topic "led light emitting" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

White emitting polyfluorene functionalized with azide hybridized on near-UV light emitting diode  

E-Print Network (OSTI)

White emitting polyfluorene functionalized with azide hybridized on near-UV light emitting diode generation using CdSe/ZnS core-shell nanocrystals hybridized with InGaN/GaN light emitting diodesGaN/conjugated polymer hybrid light-emitting diodes," Appl. Phys. Lett. 70, 2664-2666 (1997). 9. H. V. Demir, S

Demir, Hilmi Volkan

162

New and Underutilized Technology: High Bay LED Lighting | Department of  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

High Bay LED Lighting High Bay LED Lighting New and Underutilized Technology: High Bay LED Lighting October 7, 2013 - 8:55am Addthis The following information outlines key deployment considerations for high bay LED lighting within the Federal sector. Benefits LED light sources offer several potential benefits compared to metal halide or fluorescent lighting, including reduced energy consumption due to the ability to provide a more precise light distribution; longer operating life and lower maintenance requirements; less heat introduced into the space; and greater controllability for dimming and on/off control. Relevant to the cold storage application, LED performance improves in colder temperatures. Application High bay LED lighting is applicable for facilities containing high bay

163

LED lamp  

SciTech Connect

There is herein described a lamp for providing white light comprising a plurality of light sources positioned on a substrate. Each of said light sources comprises a blue light emitting diode (LED) and a dome that substantially covers said LED. A first portion of said blue light from said LEDs is transmitted through said domes and a second portion of said blue light is converted into a red light by a first phosphor contained in said domes. A cover is disposed over all of said light sources that transmits at least a portion of said red and blue light emitted by said light sources. The cover contains a second phosphor that emits a yellow light in response to said blue light. The red, blue and yellow light combining to form the white light and the white light having a color rendering index (CRI) of at least about 80.

Galvez, Miguel; Grossman, Kenneth; Betts, David

2013-11-12T23:59:59.000Z

164

Fabrication of poly(p-phenyleneacetylene) light-emitting diodes  

DOE Patents (OSTI)

Acetylene-containing poly(p-phenyleneacetylene) (PPA)-based light-emitting diodes (LEDs) are provided. The LEDs are fabricated by coating a hole-injecting electrode, preferably an indium tin oxide (ITO) coated glass substrate, with a PPA polymer, such as a 2,5-dibutoxy or a 2,5-dihexoxy derivative of PPA, dissolved in an organic solvent. This is then followed by evaporating a layer of material capable of injecting electrons, such as Al or Al/Ca, onto the polymer to form a base electrode. This composition is then annealed to form efficient EL diodes. 8 figs.

Shinar, J.; Swanson, L.S.; Lu, F.; Ding, Y.

1994-08-02T23:59:59.000Z

165

Poly (p-phenyleneacetylene) light-emitting diodes  

DOE Patents (OSTI)

Acetylene containing poly(p-phenyleneacetylene) (PPA) - based light-emitting diodes (LEDs) are provided. The LEDs are fabricated by coating a hole-injecting electrode, preferably an indium tin oxide (ITO) coated glass substrate, with a PPA polymer, such as a 2,5-dibutoxy or a 2,5-dihexoxy derivative of PPA, dissolved in an organic solvent. This is then followed by evaporating a layer of material capable of injecting electrons, such as Al or Al/Ca, onto the polymer to form a base electrode. This composition is then annealed to form efficient EL diodes. 8 figs.

Shinar, J.; Swanson, L.S.; Lu, F.; Ding, Y.; Barton, T.J.; Vardeny, Z.V.

1994-10-04T23:59:59.000Z

166

Fabrication of poly(p-phenyleneacetylene) light-emitting diodes  

DOE Patents (OSTI)

Acetylene containing poly(p-phenyleneacetylene) (PPA) - based light-emitting diodes (LEDs) are provided. The LEDs are fabricated by coating a hole-injecting electrode, preferably an indium tin oxide (ITO) coated glass substrate, with a PPA polymer, such as a 2,5-dibutoxy or a 2,5-dihexoxy derivative of PPA, dissolved in an organic solvent. This is then followed by evaporating a layer of material capable of injecting electrons, such as A1 or A1/Ca, onto the polymer to form a base electrode. This composition is then annealed to form efficient EL diodes.

Shinar, Joseph (Ames, IA); Swanson, Leland S. (Ames, IA); Lu, Feng (Ames, IA); Ding, Yiwei (Ames, IA)

1994-08-02T23:59:59.000Z

167

Poly (p-phenyleneneacetylene) light-emitting diodes  

DOE Patents (OSTI)

Acetylene containing poly(p-phenyleneacetylene) (PPA) - based light-emitting diodes (LEDs) are provided. The LEDs are fabricated by coating a hole-injecting electrode, preferably an indium tin oxide (ITO) coated glass substrate, with a PPA polymer, such as a 2,5-dibutoxy or a 2,5-dihexoxy derivative of PPA, dissolved in an organic solvent. This is then followed by evaporating a layer of material capable of injecting electrons, such as Al or Al/Ca, onto the polymer to form a base electrode. This composition is then annealed to form efficient EL diodes.

Shinar, Joseph (Ames, IA); Swanson, Leland S. (Ames, IA); Lu, Feng (Ames, IA); Ding, Yiwei (Ames, IA); Barton, Thomas J. (Ames, IA); Vardeny, Zeev V. (Salt Lake City, UT)

1994-10-04T23:59:59.000Z

168

Solid-State Lighting: Text-Alternative Version: LED Essentials -  

NLE Websites -- All DOE Office Websites (Extended Search)

Essentials - Technology, Applications, Advantages, Disadvantages to someone Essentials - Technology, Applications, Advantages, Disadvantages to someone by E-mail Share Solid-State Lighting: Text-Alternative Version: LED Essentials - Technology, Applications, Advantages, Disadvantages on Facebook Tweet about Solid-State Lighting: Text-Alternative Version: LED Essentials - Technology, Applications, Advantages, Disadvantages on Twitter Bookmark Solid-State Lighting: Text-Alternative Version: LED Essentials - Technology, Applications, Advantages, Disadvantages on Google Bookmark Solid-State Lighting: Text-Alternative Version: LED Essentials - Technology, Applications, Advantages, Disadvantages on Delicious Rank Solid-State Lighting: Text-Alternative Version: LED Essentials - Technology, Applications, Advantages, Disadvantages on Digg

169

Solid-State Lighting: DOE Hosts LED Industry Standards Workshop  

NLE Websites -- All DOE Office Websites (Extended Search)

Information Information Resources Printable Version Share this resource Send a link to Solid-State Lighting: DOE Hosts LED Industry Standards Workshop to someone by E-mail Share Solid-State Lighting: DOE Hosts LED Industry Standards Workshop on Facebook Tweet about Solid-State Lighting: DOE Hosts LED Industry Standards Workshop on Twitter Bookmark Solid-State Lighting: DOE Hosts LED Industry Standards Workshop on Google Bookmark Solid-State Lighting: DOE Hosts LED Industry Standards Workshop on Delicious Rank Solid-State Lighting: DOE Hosts LED Industry Standards Workshop on Digg Find More places to share Solid-State Lighting: DOE Hosts LED Industry Standards Workshop on AddThis.com... Conferences & Meetings Past Conferences Presentations Publications Webcasts Videos Tools

170

passivation of InGaN/GaN nanopillar light emitting diodes.  

E-Print Network (OSTI)

??Recently, InGaN/GaN based blue light emitting diodes (LEDs) have become widely available commercially, but their efficiency is reduced due to the quantum confined Stark effect… (more)

Choi, Won

2013-01-01T23:59:59.000Z

171

Physical properties and design of light-emitting devices based on organic materials and nanoparticles  

E-Print Network (OSTI)

This thesis presents the detailed experimental and theoretical characterization of light-emitting devices (LEDs) based on organic semiconductors and colloidal quantum dots (QDs). This hybrid material system has several ...

Anikeeva, Polina Olegovna

2009-01-01T23:59:59.000Z

172

Tailoring optical properties of light-emitting diodes by nanostructuring with nanospheres.  

E-Print Network (OSTI)

???III-V nitride based light-emitting diodes (LEDs) have experienced rapid developments during past decade, proving their potential to substitute conventional incandescent bulbs and fluorescent lamps to… (more)

??

2012-01-01T23:59:59.000Z

173

Colloidal semiconductor nanocrystals as nanoscale emissive probes in light emitting diodes and cell biology  

E-Print Network (OSTI)

This thesis employs colloidal semiconductor nanocrystals (NCs) as nanoscale emissive probes to investigate the physics of light emitting diodes (LEDs), as well as to unveil properties of cells that conventional imaging ...

Huang, Hao, Ph. D. Massachusetts Institute of Technology

2008-01-01T23:59:59.000Z

174

Room-temperature direct bandgap electroluminesence from Ge-on-Si light-emitting diodes  

E-Print Network (OSTI)

We report what we believe to be the first demonstration of direct bandgap electroluminescence (EL) from Ge/Si heterojunction light-emitting diodes (LEDs) at room temperature. In-plane biaxial tensile strain is used to ...

Sun, Xiaochen

175

Researchers Say They've Solved the Mystery of LED Lighting "Droop" |  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Researchers Say They've Solved the Mystery of LED Lighting "Droop" Researchers Say They've Solved the Mystery of LED Lighting "Droop" Researchers Say They've Solved the Mystery of LED Lighting "Droop" May 5, 2011 - 3:32pm Addthis An illustration of nitride-based LEDs.| Courtesy of the National Energy Research Scientific Computing Center. An illustration of nitride-based LEDs.| Courtesy of the National Energy Research Scientific Computing Center. Margie Wylie Communications Specialist, Berkeley Lab Computing Sciences Team. Despite being cool, ultra-efficient and long lasting, the light-emitting diode (LED) faces a problem called "efficiency droop." New findings from simulations carried out at the National Energy Research Scientific Computer Center (NERSC) have unearthed droop's elusive cause, researchers

176

LED Lighting: Just the Facts, Please! | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

LED Lighting: Just the Facts, Please! LED Lighting: Just the Facts, Please! LED Lighting: Just the Facts, Please! January 4, 2010 - 7:30am Addthis John Lippert My June 16, 2009 blog gave tips on purchasing high-quality LED lights. Now there's another arsenal in the toolbox to help consumers find LED lights they can trust: the Lighting Facts(tm) label. As part of the SSL Quality Advocates voluntary pledge program developed jointly by the U.S. Department of Energy and the Next Generation Lighting Industry Alliance (NGLIA), the label is similar to the familiar nutrition label found on most food products. The label contains a lot of information that can help a consumer compare lighting products, including: light output in lumens; watts, the power the light consumes; lumens per watt, a measure of the product's efficacy (how

177

LED Lights for All Occasions | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Lights for All Occasions Lights for All Occasions LED Lights for All Occasions November 15, 2012 - 1:15pm Addthis With such a variety of lights available, LEDs are a perfect choice for holiday lighting. | Photo courtesy of ©iStockphoto.com/Birzio With such a variety of lights available, LEDs are a perfect choice for holiday lighting. | Photo courtesy of ©iStockphoto.com/Birzio Elizabeth Spencer Communicator, National Renewable Energy Laboratory What does this mean for me? Energy-efficient LED lights can be used to save money while decorating this holiday season. The topic of lighting is no stranger to the Energy Saver blog. And energy-efficient lights--and particularly LEDs--are one of those wonderful things that come up a lot around the holidays, since there are so many wonderful ways to use them. But it's still too early to talk about

178

Have You Used LED Light Strings? | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

LED Light Strings? LED Light Strings? Have You Used LED Light Strings? December 3, 2009 - 7:30am Addthis This week, you read about LED holiday light strings, which can use 90% less energy than regular incandescent light strings. You may even be able to save on the initial costs with rebates from stores or your utility; check to find out what's being offered in your area. Have you used LED light strings? Tell us what you think of them. Each Thursday, you have the chance to share your thoughts on a question about energy efficiency or renewable energy for consumers. E-mail your responses to the Energy Saver team at consumer.webmaster@nrel.gov. Addthis Related Articles Save Money with LED Holiday Light Strings Tips to Save Energy During the Holidays Choosing Energy-Saving Lighting Products Saves You Money

179

Medical Applications of Space Light-Emitting Diode Technology--Space Station and Beyond  

SciTech Connect

Space light-emitting diode (LED) technology has provided medicine with a new tool capable of delivering light deep into tissues of the body, at wavelengths which are biologically optimal for cancer treatment and wound healing. This LED technology has already flown on Space Shuttle missions, and shows promise for wound healing applications of benefit to Space Station astronauts.

Whelan, H.T.; Houle, J.M.; Donohoe, D.L.; Bajic, D.M.; Schmidt, M.H.; Reichert, K.W.; Weyenberg, G.T.; Larson, D.L.; Meyer, G.A.; Caviness, J.A.

1999-06-01T23:59:59.000Z

180

Integrated LED-based luminare for general lighting  

DOE Patents (OSTI)

Lighting apparatus and methods employing LED light sources are described. The LED light sources are integrated with other components in the form of a luminaire or other general purpose lighting structure. Some of the lighting structures are formed as Parabolic Aluminum Reflector (PAR) luminaires, allowing them to be inserted into conventional sockets. The lighting structures display beneficial operating characteristics, such as efficient operation, high thermal dissipation, high output, and good color mixing.

Dowling, Kevin J.; Lys, Ihor A.; Roberge, Brian; Williamson, Ryan C.; Roberts, Ron; Datta, Michael; Mollnow, Tomas; Morgan, Frederick M.

2013-03-05T23:59:59.000Z

Note: This page contains sample records for the topic "led light emitting" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

LED Traffic Lights Get Buy American Stamp | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

LED Traffic Lights Get Buy American Stamp LED Traffic Lights Get Buy American Stamp LED Traffic Lights Get Buy American Stamp November 29, 2010 - 10:00am Addthis LED traffic lights are assembled at Dialight’s factory in Roxboro, N.C. The company has expanded production at the facility, adding more than 100 jobs over the past two years. | Photo Courtesy of Dialight LED traffic lights are assembled at Dialight's factory in Roxboro, N.C. The company has expanded production at the facility, adding more than 100 jobs over the past two years. | Photo Courtesy of Dialight Lindsay Gsell LED traffic lights are assembled at Dialight's factory in Roxboro, N.C. The company has expanded production at the facility, adding more than 100 jobs over the past two years. Red. Yellow. Green. What LED traffic signals don't say: Made in USA.

182

Charge Profiling of the p-AlGaN Electron Blocking Layer in AlGaInN Light Emitting Diode Structures  

E-Print Network (OSTI)

Charge Profiling of the p-AlGaN Electron Blocking Layer in AlGaInN Light Emitting Diode Structures, U.S.A. ABSTRACT Characterization of operational AlGaInN heterostructure light emitting diodes (LEDs the device lifetime in a non-destructive mode. INTRODUCTION Group ­ III nitride light emitting diodes (LEDs

Wetzel, Christian M.

183

Solid-State Lighting: Model Specification for LED Roadway Luminaires  

NLE Websites -- All DOE Office Websites (Extended Search)

Model Specification for LED Roadway Luminaires to someone by E-mail Share Solid-State Lighting: Model Specification for LED Roadway Luminaires on Facebook Tweet about Solid-State...

184

Solid-State Lighting: Text-Alternative Version: LED Replacements...  

NLE Websites -- All DOE Office Websites (Extended Search)

Text-Alternative Version: LED Replacements for Linear Fluorescent Lamps to someone by E-mail Share Solid-State Lighting: Text-Alternative Version: LED Replacements for Linear...

185

Solid-State Lighting: LED Replacements for Linear Fluorescent...  

NLE Websites -- All DOE Office Websites (Extended Search)

LED Replacements for Linear Fluorescent Lamps Webcast to someone by E-mail Share Solid-State Lighting: LED Replacements for Linear Fluorescent Lamps Webcast on Facebook Tweet about...

186

Ultra Bright LED Light Injection Calibration System for MINOS  

E-Print Network (OSTI)

We describe here a proposal for a light injection calibration system for the MINOS detectors based on ultra bright blue LEDs as the light source. We have shown that these LEDs are bright enough to span over two orders of magnitude in light intensity, commensurate with that expected in a single scintillator strip in the MINOS neutrino detectors.

B. Anderson; A. Anjomshoaa; P. Dervan; J. A. Lauber; J. Thomas

1998-10-26T23:59:59.000Z

187

Ultra Bright LED Light Injection Calibration System for MINOS  

E-Print Network (OSTI)

We describe here a proposal for a light injection calibration system for the MINOS detectors based on ultra bright blue LEDs as the light source. We have shown that these LEDs are bright enough to span over two orders of magnitude in light intensity, commensurate with that expected in a single scintillator strip in the MINOS neutrino detectors. 1

B. Anderson; A. Anjomshoaa; P. Dervan; J. A. Lauber; J. Thomas

2008-01-01T23:59:59.000Z

188

Ultra Bright LED Light Injection Calibration System for MINOS  

E-Print Network (OSTI)

We describe here a proposal for a light injection calibration system for the MINOS detectors based on ultra bright blue LEDs as the light source. We have shown that these LEDs are bright enough to span over two orders of magnitude in light intensity, commensurate with that expected in a single scintillator strip in the MINOS neutrino detectors.

Anderson, B; Dervan, P J; Lauber, J A; Thomas, J

1999-01-01T23:59:59.000Z

189

Coupling Fibers to Semiconductor Sources To learn to couple an injection laser diode (ILD) and a light emitting diode  

E-Print Network (OSTI)

) and a light emitting diode (LED) to an optical fiber. Equipment: · 1 ~ 2 meters of F-MLD-50 multimode fiber off any other part of the circuit. Light Emitting Diode- 1.) Post mount the LED assembly the same way

Collins, Gary S.

190

LED Lighting on the National Mall | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

LED Lighting on the National Mall LED Lighting on the National Mall LED Lighting on the National Mall Addthis 1 of 8 Facing East toward the Capitol Building, LED retrofitted lights line the interior paths of the mall while preserving the architectural integrity of the original fixtures. Image: Energy Department Image | Photo by Quentin Kruger (Contractor) | Public Domain Date taken: 2012-01-30 06:00 2 of 8 Energy Secretary Steven Chu discusses the 65% savings on electric bills and lowered maintenance costs the National Parks Service is experiencing by switching to energy efficient LED lights. "Using energy-efficient LED light bulbs is an important way Americans can save money by saving energy," said Secretary Chu. "Investing in an American economy that is built to last includes taking advantage of all of America's energy resources while

191

White Light Emitting Diode Development for General Illumination Applications  

SciTech Connect

This report contains a summary of technical achievements during a 3-year project aimed at developing the chip and packaging technology necessary to demonstrate efficient, high flux light-emitting diode (LED) arrays using Cree's gallium nitride/silicon carbide (GaN/SiC) LED technology as the starting point. Novel chip designs and fabrication processes are described that led to high power blue LEDs that achieved 310 mW of light output at 350 mA drive current, corresponding to quantum and wall plug efficiencies of 32.5% and 26.5%, respectively. When combined with phosphor, high power white LEDs with luminous output of 67 lumens and efficacy of 57 lumens per watt were also demonstrated. Advances in packaging technology are described that enabled compact, multi-chip white LED lamp modules with 800-1000 lumens output at efficacies of up to 55 lumens per watt. Lamp modules with junction-to-ambient thermal resistance as low as 1.7 C/watt have also been demonstrated.

James Ibbetson

2006-05-01T23:59:59.000Z

192

Photonic crystal laser lift-off GaN light-emitting diodes Aurlien David,a  

E-Print Network (OSTI)

Photonic crystal laser lift-off GaN light-emitting diodes Aurélien David,a Tetsuo Fujii,b Brendan March 2006 We report on the fabrication and study of laser lift-off GaN-based light-emitting diodes-state lighting. However, as is the case for any light-emitting diode LED , light tends to be trapped in the high

Recanati, Catherine

193

Life cycle assessment of LED road lighting.  

E-Print Network (OSTI)

???It is observed that the power consumption of road lighting is increased with the length of trafficable road in Hong Kong. The energy used in… (more)

Chan, Ho-kan.

2012-01-01T23:59:59.000Z

194

Information Resources: Webcast: Evaluating LED Street Lighting Solutions  

NLE Websites -- All DOE Office Websites (Extended Search)

Evaluating LED Street Lighting Solutions Evaluating LED Street Lighting Solutions In this July 20, 2010 webcast, Edward Smalley of Seattle City Light provided an update on DOE Municipal Solid-State Street Lighting Consortium activities. The webcast also presented perspectives from members who are involved with implementing LED street lighting evaluations, including Tod Rosinbum of the City of Portland, Oregon, John Walter of National Grid, and Amy Olay of the City of San Jose, California. View presentation slides (Visit the Adobe® Web site to Download Adobe Reader.) Introduction (PDF 984 KB) Edward Smalley, DOE Municipal Solid-State Street Lighting Consortium, Moderator Evaluating LED Street Lighting Solutions (PDF 404 KB) Tod Rosinbum, City of Portland, Oregon LED Pilot Projects: A Utility Perspective (PDF 112 KB)

195

Solid-State Lighting: LED Essentials - Technology, Applications...  

NLE Websites -- All DOE Office Websites (Extended Search)

Applications, Advantages, Disadvantages to someone by E-mail Share Solid-State Lighting: LED Essentials - Technology, Applications, Advantages, Disadvantages on Facebook Tweet...

196

Information Resources: Member Case Studies: LED Street Lighting...  

NLE Websites -- All DOE Office Websites (Extended Search)

Member Case Studies: LED Street Lighting Programs in Algona (IA), Asheville (NC), and Boston (MA) This May 8, 2013 webcast featured presentations from DOE Municipal Solid-State...

197

Integrated System Of White Led Visible-Light Communication And Power-Line Communication  

E-Print Network (OSTI)

White LEDs offer advantageous properties such as high brightness, reliability, lower power consumption and long lifetime. The biggest potential application for white LEDs will be general illumination and lighting. Indoor wireless optical communication systems employing white LED lighting have been proposed. This system will enable high QoS by the high power from this lighting equipment. But, it is difficult for existing offices communication using existing power-line is proposed. This system is emitted as visible-light from LED lighting according to the transmitted signal waveform without demodulating the signal from the power-line. This system is expected to be applicable from the existing illuminant easily like exchanging electric bulbs. This integrated system will surely have a big impact as a new signal transmission system and its economical effect will be great. The basic performance of this system is analyzed. The actual system is built and its feasibility is shown through experiments.

Toshihiko Komine; Masao Nakagawa

2002-01-01T23:59:59.000Z

198

Solid-State Lighting: Text-Alternative Version: LED Replacement...  

NLE Websites -- All DOE Office Websites (Extended Search)

I'd like to welcome everyone to this webcast on the very timely topic of light emitting diode replacement lamps and the latest on the ENERGY STAR programs efforts in this...

199

Light emitting diode with high aspect ratio submicron roughness for light extraction and methods of forming  

DOE Patents (OSTI)

The surface morphology of an LED light emitting surface is changed by applying a reactive ion etch (RIE) process to the light emitting surface. High aspect ratio, submicron roughness is formed on the light emitting surface by transferring a thin film metal hard-mask having submicron patterns to the surface prior to applying a reactive ion etch process. The submicron patterns in the metal hard-mask can be formed using a low cost, commercially available nano-patterned template which is transferred to the surface with the mask. After subsequently binding the mask to the surface, the template is removed and the RIE process is applied for time duration sufficient to change the morphology of the surface. The modified surface contains non-symmetric, submicron structures having high aspect ratio which increase the efficiency of the device.

Li, Ting (Ventura, CA)

2011-04-26T23:59:59.000Z

200

Light emitting diode with high aspect ratio submicron roughness for light extraction and methods of forming  

SciTech Connect

The surface morphology of an LED light emitting surface is changed by applying a reactive ion etch (RIE) process to the light emitting surface. High aspect ratio, submicron roughness is formed on the light emitting surface by transferring a thin film metal hard-mask having submicron patterns to the surface prior to applying a reactive ion etch process. The submicron patterns in the metal hard-mask can be formed using a low cost, commercially available nano-patterned template which is transferred to the surface with the mask. After subsequently binding the mask to the surface, the template is removed and the RIE process is applied for time duration sufficient to change the morphology of the surface. The modified surface contains non-symmetric, submicron structures having high aspect ratio which increase the efficiency of the device.

Li, Ting

2013-08-13T23:59:59.000Z

Note: This page contains sample records for the topic "led light emitting" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Lighting the Great Outdoors: LEDs in Exterior Applications  

SciTech Connect

Recent progress in the development of white light LEDs promises great impact by opening up the huge potential for LED illumination in new areas. One such area is general illumination for exterior applications. For example, there are an estimated combined 60.5 million roadway and parking installations in the U.S. These lights account for an estimated 53.3 TWh of electricity usage annually -- nearly 7% of all lighting. If LEDs could provide the same light performance with just 25% greater efficiency, savings of over 13 TWh could be achieved. In 2007, the authors assessed emerging LED lighting technologies in a parking garage and on a city street. The purpose of these tests was to enable a utility to determine whether energy efficiency programs promoting white light LED products might be justified. The results have supported the great promise of LEDs in exterior applications, while also highlighting the barriers that continue to hinder their widespread adoption. Such barriers include 1) inconsistent product quality across manufacturers; 2) lack of key metrics for comparing LEDs to conventional sources; and 3) high upfront cost of LED luminaires compared to conventional luminaires. This paper examines these barriers, ways in which energy-efficiency programs could help to overcome them, and the potential for energy and financial savings from LED lighting in these two exterior applications.

Cook, Tyson D. S.; Bryan, Mary M.; Kinzey, Bruce R.; Myer, Michael

2008-08-17T23:59:59.000Z

202

Understanding Drooping Light Emitting Diodes CEEM | U.S. DOE Office of  

Office of Science (SC) Website

Understanding Drooping Light Emitting Understanding Drooping Light Emitting Diodes CEEM Energy Frontier Research Centers (EFRCs) EFRCs Home Centers Research Science Highlights Highlight Archives News & Events Publications Contact BES Home 04.27.12 Understanding Drooping Light Emitting Diodes CEEM Print Text Size: A A A RSS Feeds FeedbackShare Page Scientific Achievement New calculations demonstrate that LED "droop" is dominated by multi-particle interactions. Droop occurs when increasing energy input does not produce proportionally more light. Significance and Impact Understanding "droop" may result in cheaper, more efficient LEDs; LEDs are more energy efficient, smaller, and longer-lived than incandescent lamps or fluorescent lighting. Research Details Atomistic first-principles calculations indicated that increasing amounts

203

Solid-State Lighting: Considering LEDs for Street and Area Lighting  

NLE Websites -- All DOE Office Websites (Extended Search)

Considering LEDs for Street and Area Lighting to someone by E-mail Share Solid-State Lighting: Considering LEDs for Street and Area Lighting on Facebook Tweet about Solid-State...

204

Light-emitting diode spherical packages: an equation for the light transmission efficiency  

E-Print Network (OSTI)

Virtually all light-emitting diodes (LEDs) are encapsulated with a transparent epoxy or silicone-gel. In this paper we analyze the optical efficiency of spherical encapsulants. We develop a quasi-radiometric equation for the light transmission efficiency, which incorporates some ideas of Monte-Carlo ray tracing into the context of radiometry. The approach includes the extended source nature of the LED chip, and the chip radiance distribution. The equation is an explicit function of the size and the refractive index of the package, and also of several chip parameters such as shape, size, radiance, and location inside the package. To illustrate the use of this equation, we analyze several packaging configurations of practical interest; for example, a hemispherical dome with multiple chips, a flat encapsulation as a special case of the spherical package, and approximate calculations of an encapsulant with a photonic crystal LED or with a photonic quasi crystal LED. These calculations are compared with Monte-Carl...

Moreno, Ivan; Avendano-Alejo, Maximino; 10.1364/AO.49.000012

2011-01-01T23:59:59.000Z

205

Highly Polarized Green Light Emitting Diode in m-Axis GaInN/GaN Shi You, Theeradetch Detchprohm, Mingwei Zhu  

E-Print Network (OSTI)

Highly Polarized Green Light Emitting Diode in m-Axis GaInN/GaN Shi You, Theeradetch Detchprohm in nonpolar light-emitting diodes (LEDs) covering the blue to green spectral range. In photo- luminescence, m's overall power efficiency. Linearly polarized light can be efficiently generated in GaInN/GaN-based light-emitting

Wetzel, Christian M.

206

LedEngin Inc | Open Energy Information  

Open Energy Info (EERE)

Name LedEngin, Inc Place Santa Clara, California Zip 95054 Product Developer of Light Emitting Diode (LED) technology for medical and portable applications. References LedEngin,...

207

Towards Truly White LED Lighting | U.S. DOE Office of Science...  

NLE Websites -- All DOE Office Websites (Extended Search)

to emit light of different colors is a key step toward a new kind of organic light-emitting diode, or OLED, that can emit truly white light while improving efficiency and...

208

LED Traffic Lights Get Buy American Stamp | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

LED Traffic Lights Get Buy American Stamp LED Traffic Lights Get Buy American Stamp LED Traffic Lights Get Buy American Stamp November 30, 2010 - 10:19am Addthis Red. Yellow. Green. What LED traffic signals don't say: Made in USA. That is changing. Dialight Corporation, an LED lighting manufacturer with U.S. corporate offices in Farmingdale, New Jersey, and a parent company based in the U.K., invested nearly $3 million into renovating their 75,000-square-foot production facility in Roxboro, North Carolina. With these improvements, Dialight's Roxboro plant is projected to scale up production by 400 percent. "Bringing manufacturing back to America is a win-win scenario," said Roy Burton, Dialight's Group Chief Executive. "We're helping the economy by creating new jobs, and at the same time we're finding it more

209

Solid-State Lighting: LED Site Lighting in the Commercial Building Sector:  

NLE Websites -- All DOE Office Websites (Extended Search)

Site Lighting in the Site Lighting in the Commercial Building Sector: Opportunities, Challenges, and the CBEA Performance Specification to someone by E-mail Share Solid-State Lighting: LED Site Lighting in the Commercial Building Sector: Opportunities, Challenges, and the CBEA Performance Specification on Facebook Tweet about Solid-State Lighting: LED Site Lighting in the Commercial Building Sector: Opportunities, Challenges, and the CBEA Performance Specification on Twitter Bookmark Solid-State Lighting: LED Site Lighting in the Commercial Building Sector: Opportunities, Challenges, and the CBEA Performance Specification on Google Bookmark Solid-State Lighting: LED Site Lighting in the Commercial Building Sector: Opportunities, Challenges, and the CBEA Performance Specification on Delicious

210

High Efficiency LED Lamp for Solid-State Lighting  

SciTech Connect

This report contains a summary of technical achievements during a three-year project to demonstrate high efficiency, solid-state lamps based on gallium nitride/silicon carbide light-emitting diodes. Novel chip designs and fabrication processes are described for a new type of nitride light-emitting diode with the potential for very high efficiency. This work resulted in the demonstration of blue light-emitting diodes in the one watt class that achieved up to 495 mW of light output at 350 mA drive current, corresponding to quantum and wall plug efficiencies of 51% and 45%, respectively. When combined with a phosphor in Cree's 7090 XLamp package, these advanced blue-emitting devices resulted in white light-emitting diodes whose efficacy exceeded 85 lumens per watt. In addition, up to 1040 lumens at greater than 85 lumens per watt was achieved by combining multiple devices to make a compact white lamp module with high optical efficiency.

James Ibbetson

2006-12-31T23:59:59.000Z

211

City of Phildelphia: Light emitting diodes for traffic signal displays  

SciTech Connect

This project investigated the feasibility of using light emitting diodes (LEDs) for red traffic signals in a demonstration program at 27 signalized intersections in the City of Philadelphia. LED traffic signals have the potential to achieve significant savings over standard incandescent signals in terms of energy usage and costs, signal relamping costs, signal system maintenance costs, tort liability, and environmental impact. Based on successful experience with the demonstration program, the City of Philadelphia is currently developing funding for the conversion of all existing red incandescent traffic signals at approximately 2,700 intersections to LED signals. This program is expected to cost approximately $4.0 million and save about $850,000 annually in energy costs. During late 1993 and early 1994, 212 red LED traffic signals (134 8-inch signals and 78 12-inch signals) were installed at 27 intersections in Philadelphia. The first group of 93 signals were installed at 13 prototypical intersections throughout the City. The remaining group of signals were installed on a contiguous route in West Philadelphia consisting of standard incandescent signals and LED signals interspersed in a random pattern.

1995-12-01T23:59:59.000Z

212

Optimization of light emitting diodes based on bipolar double-barrier resonant-tunneling structures  

Science Conference Proceedings (OSTI)

A bipolar double-barrier resonant-tunneling light emitting diode will have maximum emitted light intensity if (1) electrons and holes simultaneously resonant-tunnel into the quantum well, (2) the charge carriers are entirely trapped in the well as the ... Keywords: Poisson equation, Schrodinger equation, automated computer code, bipolar double-barrier RTD structures, charge carriers, chemical compositions, doping profiles, electroluminescence, electroluminescence spectrum profile, electron-hole recombination, electron-hole recombination rate, geometric structures, light emitting diodes, near zero-field condition, optimisation, quantum well, resonant tunnelling diodes, resonant-tunneling LED, semiconductor device models, semiconductor quantum wells, temperature stability, theoretical modeling, thermal stability

A. Kindlihagen; K. A. Chao; M. Willander; J. Genoe

1995-11-01T23:59:59.000Z

213

Solid-State Lighting: Member Case Studies: LED Street Lighting Programs in  

NLE Websites -- All DOE Office Websites (Extended Search)

Member Case Studies: LED Street Member Case Studies: LED Street Lighting Programs in Algona (IA), Asheville (NC), and Boston (MA) to someone by E-mail Share Solid-State Lighting: Member Case Studies: LED Street Lighting Programs in Algona (IA), Asheville (NC), and Boston (MA) on Facebook Tweet about Solid-State Lighting: Member Case Studies: LED Street Lighting Programs in Algona (IA), Asheville (NC), and Boston (MA) on Twitter Bookmark Solid-State Lighting: Member Case Studies: LED Street Lighting Programs in Algona (IA), Asheville (NC), and Boston (MA) on Google Bookmark Solid-State Lighting: Member Case Studies: LED Street Lighting Programs in Algona (IA), Asheville (NC), and Boston (MA) on Delicious Rank Solid-State Lighting: Member Case Studies: LED Street Lighting Programs in Algona (IA), Asheville (NC), and Boston (MA) on Digg

214

Development of Advanced LED Phosphors by Spray-based Processes for Solid State Lighting  

SciTech Connect

The overarching goal of the project was to develop luminescent materials using aerosol processes for making improved LED devices for solid state lighting. In essence this means improving white light emitting phosphor based LEDs by improvement of the phosphor and phosphor layer. The structure of these types of light sources, displayed in Figure 1, comprises of a blue or UV LED under a phosphor layer that converts the blue or UV light to a broad visible (white) light. Traditionally, this is done with a blue emitting diode combined with a blue absorbing, broadly yellow emitting phosphor such as Y{sub 3}Al{sub 5}O{sub 12}:Ce (YAG). A similar result may be achieved by combining a UV emitting diode and at least three different UV absorbing phosphors: red, green, and blue emitting. These emitted colors mix to make white light. The efficiency of these LEDs is based on the combined efficiency of the LED, phosphor, and the interaction between the two. The Cabot SSL project attempted to improve the over all efficiency of the LED light source be improving the efficiency of the phosphor and the interaction between the LED light and the phosphor. Cabot's spray based process for producing phosphor powders is able to improve the brightness of the powder itself by increasing the activator (the species that emits the light) concentration without adverse quenching effects compared to conventional synthesis. This will allow less phosphor powder to be used, and will decrease the cost of the light source; thus lowering the barrier of entry to the lighting market. Cabot's process also allows for chemical flexibility of the phosphor particles, which may result in tunable emission spectra and so light sources with improved color rendering. Another benefit of Cabot's process is the resulting spherical morphology of the particles. Less light scattering results when spherical particles are used in the phosphor layer (Figure 1) compared to when conventional, irregular shaped phosphor particles are used. This spherical morphology will result in better light extraction and so an improvement of efficiency in the overall device. Cabot is a 2.5 billion dollar company that makes specialized materials using propriety spray based technologies. It is a core competency of Cabot's to exploit the spray based technology and resulting material/morphology advantages. Once a business opportunity is clearly identified, Cabot is positioned to increase the scale of the production to meet opportunity's need. Cabot has demonstrated the capability to make spherical morphology micron-sized phosphor powders by spray based routes for PDP and CRT applications, but the value proposition is still unproven for LED applications. Cabot believes that the improvements in phosphor powders yielded by their process will result in a commercial advantage over existing technologies. Through the SSL project, Cabot has produced a number of different compositions in a spherical morphology that may be useful for solid state lights, as well as demonstrated processes that are able to produce particles from 10 nanometers to 3 micrometers. Towards the end of the project we demonstrated that our process produces YAG:Ce powder that has both higher internal quantum efficiency (0.6 compared to 0.45) and external quantum efficiency (0.85 compared to 0.6) than the commercial standard (see section 3.4.4.3). We, however, only produced these highly bright materials in research and development quantities, and were never able to produce high quantum efficiency materials in a reproducible manner at a commercial scale.

Cabot Corporation

2007-09-30T23:59:59.000Z

215

Advanced method for increasing the efficiency of white light quantum dot LEDs  

SciTech Connect

Covering a light-emitting diode (LED) with quantum dots (QDs) can produce a broad spectrum of white light. However, current techniques for applying QDs to LEDs suffer from a high density of defects and a non-uniform distribution of QDs, which, respectively, diminish the efficiency and quality of emitted light. Oak Ridge National Laboratory (ORNL) has the unique capability to thermally anneal QD structures at extremely high power densities for very short durations. This process, called pulse thermal processing (PTP), reduces the number of point defects while maintaining the size and shape of the original QD nanostructure. Therefore, the efficiency of the QD wavelength conversion layer is improved without altering the emission spectrum defined by the size distribution of theQD nanoparticles. The current research uses a thermal model to predict annealing temperatures during PTP and demonstrates up to a 300% increase in photoluminescence for QDs on passive substrates.

Duty, Chad E [ORNL; Bennett, Charlee J C [ORNL; Sabau, Adrian S [ORNL; Jellison Jr, Gerald Earle [ORNL; Boudreaux, Philip R [ORNL; Walker, Steven C [ORNL; Ott, Ronald D [ORNL

2011-01-01T23:59:59.000Z

216

Enhanced coupling of light from organic light emitting diodes using nanoporous films  

E-Print Network (OSTI)

Enhanced coupling of light from organic light emitting diodes using nanoporous films H. J. Peng, Y the light extraction efficiency for organic light emitting diode OLED . Nanoporous alumina film was used by Bragg scattering. The corrugated light- emitting diode had two-times the efficiency as compared

Kwok, Hoi S.

217

Assessment of Electrical, Efficiency, and Photometric Performance of Advanced Lighting Technologies: Dimmable Advanced Lighting Tech nologies -- Electronic Fluorescent, High-Intensity Discharge, and Light-Emitting Diode  

Science Conference Proceedings (OSTI)

This EPRI Technical Report is a compilation of four technical updates that address the basic dimming performance of advanced lighting sources: EPRI report 1018476 for linear fluorescent ballasts, 1018477 for hot and cold cathode compact fluorescent lamps, 1018479 for electronic high-intensity discharge (HID) ballasts, and 1018480 for light-emitting diode (LED) lighting. Chapter 1 provides a discussion of basic lighting control, the importance of considering power quality in lighting control, lighting con...

2008-12-22T23:59:59.000Z

218

TRICOLOR LIGHT EMITTING DIODE DOT MATRIX DISPLAY SYSTEM WITHAUDIO OUTPUT  

E-Print Network (OSTI)

1 TRICOLOR LIGHT EMITTING DIODE DOT MATRIX DISPLAY SYSTEM WITHAUDIO OUTPUT Grantham Pang, Chi emitting diodes; tricolor display; audio communication. I. Introduction This paper relates to a tricolor broadcasting through the visible light rays transmitted by the display panel or assembly. Keywords: light

Pang, Grantham

219

Efficiency enhancement of microcavity organic light emitting diodes  

Science Conference Proceedings (OSTI)

We report microcavity efficiency enhancement of organic electroluminescent devices based on the hole transporter bis(triphenyl) diamine and the electron transporter and light emitter tris(8?hydroxyquinoline) aluminum.Microcavityorganic light emitting diodes are described that emit four times the light measured in the forward direction (spectrally integrated)

R. H. Jordan; A. Dodabalapur; R. E. Slusher

1996-01-01T23:59:59.000Z

220

Organic light-emitting devices using spin-dependent processes  

DOE Patents (OSTI)

The maximum luminous efficiency of organic light-emitting materials is increased through spin-dependent processing. The technique is applicable to all electro-luminescent processes in which light is produced by singlet exciton decay, and all devices which use such effects, including LEDs, super-radiant devices, amplified stimulated emission devices, lasers, other optical microcavity devices, electrically pumped optical amplifiers, and phosphorescence (Ph) based light emitting devices. In preferred embodiments, the emissive material is doped with an impurity, or otherwise modified, to increase the spin-lattice relaxation rate (i.e., decrease the spin-lattice time), and hence raise the efficiency of the device. The material may be a polymer, oligomer, small molecule, single crystal, molecular crystal, or fullerene. The impurity is preferably a magnetic or paramagnetic substance. The invention is applicable to IR, UV, and other electromagnetic radiation generation and is thus not limited to the visible region of the spectrum. The methods of the invention may also be combined with other techniques used to improve device performance.

Vardeny, Z. Valy (Salt Lake City, UT); Wohlgenannt, Markus (Salt Lake City, UT)

2010-03-23T23:59:59.000Z

Note: This page contains sample records for the topic "led light emitting" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Optimized Phosphors for Warm White LED Light Engines  

Science Conference Proceedings (OSTI)

The objective of this program is to develop phosphor systems and LED light engines that have steady-state LED efficacies (using LEDs with a 60% wall-plug efficiency) of 105–120 lm/W with correlated color temperatures (CCT) ~3000 K, color rendering indices (CRI) >85, <0.003 distance from the blackbody curve (dbb), and <2% loss in phosphor efficiency under high temperature, high humidity conditions. In order to reach these goals, this involves the composition and processing optimization of phosphors previously developed by GE in combination with light engine package modification.

Setlur, Anant; Brewster, Megan; Garcia, Florencio; Hill, M. Christine; Lyons, Robert; Murphy, James; Stecher, Tom; Stoklosa, Stan; Weaver, Stan; Happek, Uwe; Aesram, Danny; Deshpande, Anirudha

2012-07-30T23:59:59.000Z

222

Photoionization of optically trapped ultracold atoms with a high-power light-emitting diode  

SciTech Connect

Photoionization of laser-cooled atoms using short pulses of a high-power light-emitting diode (LED) is demonstrated. Light pulses as short as 30 ns have been realized with the simple LED driver circuit. We measure the ionization cross section of {sup 85}Rb atoms in the first excited state, and show how this technique can be used for calibrating efficiencies of ion detector assemblies.

Goetz, Simone; Hoeltkemeier, Bastian; Amthor, Thomas; Weidemueller, Matthias [Physikalisches Institut, Universitaet Heidelberg, Im Neuenheimer Feld 226, 69120 Heidelberg (Germany)

2013-04-15T23:59:59.000Z

223

C. Wetzel et al MRS Internet J. Nitride Semicond. Res. 10, 2 (2005) 1 Development of High Power Green Light Emitting Diode Chips  

E-Print Network (OSTI)

Power Green Light Emitting Diode Chips C. Wetzel and T. Detchprohm Future Chips Constellation Abstract The development of high emission power green light emitting diodes chips using GaInN/GaN multi production-scale implementation of this green LED die process. Keywords: nitrides, light emitting diode

Wetzel, Christian M.

224

Si Heterostructures for Pure UV Light Emitting Diode with Carrier ...  

Science Conference Proceedings (OSTI)

Presentation Title, Development of ZnO/MgO/p+-Si Heterostructures for Pure UV Light Emitting Diode with Carrier Blocking Layer. Author(s), Byung Oh Jung, ...

225

Improved Performance of a Fluorescent Blue Organic Light Emitting ...  

Science Conference Proceedings (OSTI)

Presentation Title, Improved Performance of a Fluorescent Blue Organic Light Emitting Diode with Hole Blocking Materials as Dopants for Transport Layers.

226

Quantum Efficiency of Micron Scaled Organic Light Emitting Diodes ...  

Science Conference Proceedings (OSTI)

Jun 1, 2004 ... Quantum Efficiency of Micron Scaled Organic Light Emitting Diodes Using Atomic Force Electroluminescence Microscopy by L.S.C. Pingree ...

227

Electron traps in organic light-emitting diodes  

Science Conference Proceedings (OSTI)

This work presents the effects of electron traps in organic light-emitting diodes using a model which includes charge injection

Min-Jan Tsai; Hsin-Fei Meng

2005-01-01T23:59:59.000Z

228

Red-Emitting Phosphors for Solid-State Lighting - Energy ...  

Exceeds traditional LED color quality; Improved energy efficiency; Applications and Industries. Electronics; Solid-state lighting; Photocatalysis; Ion Conducting ...

229

Assessing the Performance of 5mm White LED Light Sources forDeveloping-Country Applications  

DOE Green Energy (OSTI)

Some white light-emitting diode (LED) light sources haverecently attained levels of efficiency and cost that allow them tocompete with fluorescent lighting for off-grid applications in thedeveloping world. Additional attributes (optics, size, ruggedness, andservice life) make them potentially superior products. Enormousreductions in energy use and greenhouse-gas emissions are thus possible,and system costs can be much lower given the ability to downsize thecharging and energy storage components compared to a fluorescentstrategy. However, there is a high risk of "market-spoiling" if inferiorproducts are introduced and result in user dissatisfaction. Completesystems involve the integration of light sources and optics, energysupply, and energy storage. A natural starting point for evaluatingproduct quality is to focus on the individual light sources. This reportdescribes testing results for batches of 10 5mm white LEDs from 26manufacturers. Efficacies and color properties are presented.

Mills, Evan

2007-05-03T23:59:59.000Z

230

LED Holiday Lights: Festive, Safe, and Efficient! | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

LED Holiday Lights: Festive, Safe, and Efficient! LED Holiday Lights: Festive, Safe, and Efficient! LED Holiday Lights: Festive, Safe, and Efficient! December 2, 2010 - 4:34pm Addthis Andy Oare Andy Oare Former New Media Strategist, Office of Public Affairs Ed. Note cross posted from the Energy Savers Blog. Written by Allison Casey This week brings a day that many people look forward to all year -- and I'm not talking about Thanksgiving, or Black Friday. I'm talking about that magical day when it's finally okay to drag the dusty boxes from the basement or attic, to lovingly sort and display your decorations, to untangle your light strings and set up the stepladder, all in anticipation of one glorious moment: Dad's annual trip to the emergency room. I kid (and sincerely hope that's not your yearly ritual), but in addition

231

Life-Cycle Assessment of Energy and Environmental Impacts of LED Lighting Products, Part 3: LED Environmental Testing  

SciTech Connect

This report covers the third part of a larger U.S. Department of Energy (DOE) project to assess the life-cycle environmental and resource impacts in the manufacturing, transport, use, and disposal of light-emitting diode (LED) lighting products in relation to incumbent lighting technologies. All three reports are available on the DOE website (www.ssl.energy.gov/tech_reports.html). • Part 1: Review of the Life-Cycle Energy Consumption of Incandescent, Compact Fluorescent and LED Lamps; • Part 2: LED Manufacturing and Performance; • Part 3: LED Environmental Testing. Parts 1 and 2 were published in February and June 2012, respectively. The Part 1 report included a summary of the life-cycle assessment (LCA) process and methodology, provided a literature review of more than 25 existing LCA studies of various lamp types, and performed a meta-analysis comparing LED lamps with incandescent and compact fluorescent lamps (CFLs). Drawing from the Part 1 findings, Part 2 performed a more detailed assessment of the LED manufacturing process and used these findings to provide a comparative LCA taking into consideration a wider range of environmental impacts. Both reports concluded that the life-cycle environmental impact of a given lamp is dominated by the energy used during lamp operation—the upstream generation of electricity drives the total environmental footprint of the product. However, a more detailed understanding of end-of-life disposal considerations for LED products has become increasingly important as their installation base has grown. The Part 3 study (reported herein) was undertaken to augment the LCA findings with chemical analysis of a variety of LED, CFL, and incandescent lamps using standard testing procedures. A total of 22 samples, representing 11 different models, were tested to determine whether any of 17 elements were present at levels exceeding California or Federal regulatory thresholds for hazardous waste. Key findings include: • The selected models were generally found to be below thresholds for Federally regulated elements; • All CFLs and LED lamps and most incandescent lamps exceeded California thresholds for Copper; • Most CFL samples exceeded California thresholds for Antimony and Nickel, and half of the LED samples exceeded California thresholds for Zinc; • The greatest contributors were the screw bases, drivers, ballasts, and wires or filaments; • Overall concentrations in LED lamps were comparable to cell phones and other types of electronic devices, and were generally attributable to components other than the internal LED light sources; • Although the life-cycle environmental impact of the LED lamps is favorable when compared to CFLs and incandescent lamps, recycling will likely gain importance as consumer adoption increases. This study was exploratory in nature and was not intended to provide a definitive indication of regulatory compliance for any specific lamp model or technology. Further study would be needed to more broadly characterize the various light source technologies; to more accurately and precisely characterize a specific model; or to determine whether product redesign would be appropriate.

Tuenge, Jason R.; Hollomon, Brad; Dillon, Heather E.; Snowden-Swan, Lesley J.

2013-03-01T23:59:59.000Z

232

An Integrated Solid-State LED Luminaire for General Lighting  

Science Conference Proceedings (OSTI)

A strong systems approach to designing and building practical LED-based replacement lamps is lacking. The general method of taking high-performance LEDs and marrying them to standard printed circuit boards, drivers and a heat sink has fallen short of the promise of LED lighting. In this program, a top-down assessment of requirements and a bottom-up reinvention of LED sources, electronics, optics and mechanics have resulted in the highest performance lamp possible. The team, comprised of Color Kinetics, the leaders in LED lighting and Cree, the leaders in LED devices took an approach to reinvent the package, the driver and the overall form and aesthetic of a replacement source. The challenge was to create a new benchmark in LED lighting - the resultant lamp, a PAR38 equivalent, met the light output, color, color quality and efficacy marks set out in the program as well as being dimmable, which is important for market acceptance. The approach combined the use of multiple source die, a chip-on-board approach, a very efficient driver topology, the use of both direct emission and phosphor conversion, and a unique faceted optic to avoid the losses, artifacts and hotspots of lensed approaches. The integral heat sink provided a mechanical base and airflow using a chimney-effect for use in a wide variety of locations and orientations. These research results led to a much better understanding of the system effects of component level technologies. It was clear that best-of-breed sub-system results do not necessarily result in the best end result for the complete system. In doing this work, we did not neglect the practical aspects of these systems. These were not rarified results and commercially impractical but lent themselves to eventual commercial products in the marketplace. The end result - a high performance replacement lamp - will save significant energy while providing a high-quality light source.

Kevin Dowling; Fritz Morgan Ihor Lys; Mike Datta; Bernd Keller; Thomas Yuan

2009-03-31T23:59:59.000Z

233

Numerical Modelling of Light Emission and Propagation in (Organic) LEDs with the Green's Tensor  

E-Print Network (OSTI)

light emitting diodes, light emission, light extraction, dipole radiation, stratified media, layered surpasses incandescent sources by a factor of 2 and with further improvements light emitting diodes could on light extraction techniques from inorganic light emitting diodes we recommend chapter 5 in 1 . Organic

Floreano, Dario

234

Efficient semiconductor light-emitting device and method  

DOE Patents (OSTI)

A semiconductor light-emitting device and method. The semiconductor light-emitting device is provided with at least one control layer or control region which includes an annular oxidized portion thereof to channel an injection current into the active region, and to provide a lateral refractive index profile for index guiding the light generated within the device. A periodic composition grading of at least one of the mirror stacks in the device provides a reduced operating voltage of the device. The semiconductor light-emitting device has a high efficiency for light generation, and may be formed either as a resonant-cavity light-emitting diode (RCLED) or as a vertical-cavity surface-emitting laser (VCSEL).

Choquette, Kent D. (Albuquerque, NM); Lear, Kevin L. (Albuquerque, NM); Schneider, Jr., Richard P. (Albuquerque, NM)

1996-01-01T23:59:59.000Z

235

Efficient semiconductor light-emitting device and method  

DOE Patents (OSTI)

A semiconductor light-emitting device and method are disclosed. The semiconductor light-emitting device is provided with at least one control layer or control region which includes an annular oxidized portion thereof to channel an injection current into the active region, and to provide a lateral refractive index profile for index guiding the light generated within the device. A periodic composition grading of at least one of the mirror stacks in the device provides a reduced operating voltage of the device. The semiconductor light-emitting device has a high efficiency for light generation, and may be formed either as a resonant-cavity light-emitting diode (RCLED) or as a vertical-cavity surface-emitting laser (VCSEL). 12 figs.

Choquette, K.D.; Lear, K.L.; Schneider, R.P. Jr.

1996-02-20T23:59:59.000Z

236

Visible light emitting vertical cavity surface emitting lasers  

DOE Patents (OSTI)

A vertical cavity surface emitting laser that emits visible radiation is built upon a substrate, then having mirrors, the first mirror on top of the substrate; both sets of mirrors being a distributed Bragg reflector of either dielectrics or other materials which affect the resistivity or of semiconductors, such that the structure within the mirror comprises a plurality of sets, each having a thickness of {lambda}/2n where n is the index of refraction of each of the sets; each of the mirrors adjacent to spacers which are on either side of an optically active bulk or quantum well layer; and the spacers and the optically active layer are from one of the following material systems: In{sub z}(Al{sub y}Ga{sub 1{minus}y}){sub 1{minus}z}P, InAlGaAs, AlGaAs, InGaAs, or AlGaP/GaP, wherein the optically active region having a length equal to m {lambda}/2n{sub eff} where m is an integer and n{sub eff} is the effective index of refraction of the laser cavity, and the spacer layer and one of the mirrors being transmissive to radiation having a wavelength of {lambda}/n, typically within the green to red portion of the visible spectrum. 10 figs.

Bryan, R.P.; Olbright, G.R.; Lott, J.A.; Schneider, R.P. Jr.

1995-06-27T23:59:59.000Z

237

Improved Cognitive Function After Transcranial, Light-Emitting Diode Treatments in Chronic, Traumatic Brain Injury: Two Case Reports  

E-Print Network (OSTI)

Objective: Two chronic, traumatic brain injury (TBI) cases, where cognition improved following treatment with red and near-infrared light-emitting diodes (LEDs), applied transcranially to forehead and scalp areas, are ...

Naeser, Margaret A.

238

White organic light-emitting diodes: Status and perspective  

E-Print Network (OSTI)

White organic light-emitting diodes (OLEDs) are ultrathin, large-area light sources made from organic semiconductor materials. Over the past decades, much research has been spent on finding suitable materials to realize ...

Reineke, Sebastian

239

Indium Recovery from Discarded Light Emitting Diode (LED) Liquid ...  

Science Conference Proceedings (OSTI)

... devices, causing the excessive discharge of LCD, decreasing the landfills life cycle. ... Life Cycle Based Greenhouse Gas Footprints of Metal Production with ...

240

THE LUMINA PROJECT http://light.lbl.gov  

E-Print Network (OSTI)

components for the LED lights. #12;2 Introduction Solid-state lighting based on light emitting diode (LED

Jacobson, Arne

Note: This page contains sample records for the topic "led light emitting" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Demonstrating LED and Fiber Optic Lighting in Commissary Applications  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Demonstrating LED and Fiber Optic Demonstrating LED and Fiber Optic Lighting in Commissary Applications Joseph Konrade Energy Technology Program Specialist Federal Energy Management Program 2 GOAL OF THE PROJECT * Promote New Lighting Technology * Document Energy Savings * Duplicate the technology * Expand Alternative Financing Opportunities * Include Lighting Technology in Government Projects within Utility Service Territory 3 History * FEMP sponsored E4 audits * Audit designed to review Utility Cost, Operations and Maintenance, New Technology Application * 3 Defense Commissary Agency (DeCA) received services under the agreement with DOE * Fort George G Meade pays a high electricity rate Electricity cost $0.171/kWh (PWC sub-metered rate) * Commissary was previously unmetered - Meter installed during installation of lighting project. New meter showing higher

242

Lighting Group: Sources and Ballasts  

NLE Websites -- All DOE Office Websites (Extended Search)

incorporating LEDs into tomorrows task lights, to reducing light entrapment within the LED, to fundamental research into how Organic Lighting Emitting Diodes operate. LED and...

243

Ultra-thin ohmic contacts for p-type nitride light emitting devices  

DOE Patents (OSTI)

A semiconductor based Light Emitting Device (LED) can include a p-type nitride layer and a metal ohmic contact, on the p-type nitride layer. The metal ohmic contact can have an average thickness of less than about 25 .ANG. and a specific contact resistivity less than about 10.sup.-3 ohm-cm.sup.2.

Raffetto, Mark (Raleigh, NC); Bharathan, Jayesh (Cary, NC); Haberern, Kevin (Cary, NC); Bergmann, Michael (Chapel Hill, NC); Emerson, David (Chapel Hill, NC); Ibbetson, James (Santa Barbara, CA); Li, Ting (Ventura, CA)

2012-01-03T23:59:59.000Z

244

Using LED Lighting for Ubiquitous Indoor Wireless Networking  

E-Print Network (OSTI)

Abstract—Wireless networking is currently dominated by radio frequency (RF) techniques. However, the soon-to-be ubiquity of LED-based lighting motivated by significant energy savings provides an opportunistic deployment of widespread free-space optical (FSO) communications. LEDbased network transceivers have a variety of competitive advantages over RF including high bandwidth density, security, energy consumption, and aesthetics. They also use a highly reusable unregulated part of the spectrum (visible light). In this paper we describe results from a pilot project to demonstrate the viability of an optical free-space visible light transceiver as a basis for indoor wireless networking. Inexpensive, commercial, off-the shelf LEDs and photodiodes we used to construct two prototypes; a simplex channel as expected as a component of an asymmetric/hybrid RF-FSO system, and a full-duplex channel demonstrating the ability to isolate multiple channels. On— off keying (OOK) was applied without observable flicker in the target modulation ranges. Results indicate the viability of creating inexpensive FSO transceivers that might be embedded in commercial lighting products to support ceiling-to-floor distances of approximately 3m. Index Terms—Wireless networking, indoor communications, free-space optical communications, visible light LED, modulation, OOK, FSO. 1 I.

T. D. C. Little; P. Dib; K. Shah; N. Barraford; B. Gallagher

2008-01-01T23:59:59.000Z

245

Solid-State Lighting: Text-Alternative Version: LED Site Lighting in the  

NLE Websites -- All DOE Office Websites (Extended Search)

Site Lighting in the Commercial Building Sector: Opportunities, Challenges, Site Lighting in the Commercial Building Sector: Opportunities, Challenges, and the CBEA Performance Specification to someone by E-mail Share Solid-State Lighting: Text-Alternative Version: LED Site Lighting in the Commercial Building Sector: Opportunities, Challenges, and the CBEA Performance Specification on Facebook Tweet about Solid-State Lighting: Text-Alternative Version: LED Site Lighting in the Commercial Building Sector: Opportunities, Challenges, and the CBEA Performance Specification on Twitter Bookmark Solid-State Lighting: Text-Alternative Version: LED Site Lighting in the Commercial Building Sector: Opportunities, Challenges, and the CBEA Performance Specification on Google Bookmark Solid-State Lighting: Text-Alternative Version: LED Site

246

New Family of Tiny Crystals Glow Bright in LED Lights | Advanced Photon  

NLE Websites -- All DOE Office Websites (Extended Search)

How Serotonin Receptors Can Shape Drug Effects, from LSD to Migraine How Serotonin Receptors Can Shape Drug Effects, from LSD to Migraine Medication X-rays Paint a Picture of Picasso's Pigments Antibody Evolution Could Guide HIV Vaccine Development Blue Ruthenium Dimer Catalysis for Hydrogen Generation A High-Pressure Nano-imaging Breakthrough Science Highlights Archives: 2013 | 2012 | 2011 | 2010 2009 | 2008 | 2007 | 2006 2005 | 2004 | 2003 | 2002 2001 | 2000 | 1998 | Subscribe to APS Science Highlights rss feed New Family of Tiny Crystals Glow Bright in LED Lights JUNE 7, 2013 Bookmark and Share Laue microdiffraction pattern acquired from a nanoribbon in experiments at the APS. Minuscule crystals that glow different colors may be the missing ingredient for white light-emitting diode (LED) lighting that illuminates homes and

247

A Practical Primer to LED Technology | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

A Practical Primer to LED Technology A Practical Primer to LED Technology A Practical Primer to LED Technology More Documents & Publications EnergySavingsLightEmittingDiodesNi...

248

LED Holiday Lights: Festive, Safe, and Efficient! | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Holiday Lights: Festive, Safe, and Efficient! Holiday Lights: Festive, Safe, and Efficient! LED Holiday Lights: Festive, Safe, and Efficient! November 23, 2010 - 6:30am Addthis Allison Casey Senior Communicator, NREL This week brings a day that many people look forward to all year-and I'm not talking about Thanksgiving, or Black Friday. I'm talking about that magical day when it's finally okay to drag the dusty boxes from the basement or attic, to lovingly sort and display your decorations, to untangle your light strings and set up the stepladder, all in anticipation of one glorious moment: Dad's annual trip to the emergency room. I kid (and sincerely hope that's not your yearly ritual), but in addition to safety when hanging your lights this year, I hope you'll think about something else: efficiency.

249

Visible light surface emitting semiconductor laser  

DOE Patents (OSTI)

A vertical-cavity surface-emitting laser is disclosed comprising a laser cavity sandwiched between two distributed Bragg reflectors. The laser cavity comprises a pair of spacer layers surrounding one or more active, optically emitting quantum-well layers having a bandgap in the visible which serve as the active optically emitting material of the device. The thickness of the laser cavity is m .lambda./2n.sub.eff where m is an integer, .lambda. is the free-space wavelength of the laser radiation and n.sub.eff is the effective index of refraction of the cavity. Electrical pumping of the laser is achieved by heavily doping the bottom mirror and substrate to one conductivity-type and heavily doping regions of the upper mirror with the opposite conductivity type to form a diode structure and applying a suitable voltage to the diode structure. Specific embodiments of the invention for generating red, green, and blue radiation are described.

Olbright, Gregory R. (Boulder, CO); Jewell, Jack L. (Bridgewater, NJ)

1993-01-01T23:59:59.000Z

250

ZnO-graphene Hybrid Quantum Dots Light Emitting Diode  

Science Conference Proceedings (OSTI)

Presentation Title, ZnO-graphene Hybrid Quantum Dots Light Emitting Diode. Author(s), Won Kook Choi, Dong-Ick Son, Soon-Nam Kwon. On-Site Speaker ...

251

Highly efficient blue polyfluorene-based polymer light-emitting...  

NLE Websites -- All DOE Office Websites (Extended Search)

of Physics Volume 42 Pagination 5 Abstract A highly efficient blue polymer light-emitting diode based on poly(9,9-di(2-(2-(2-methoxy-ethoxy)ethoxy)ethyl)fluorenyl-2,7-diyl)...

252

Commercialization of Quantum Dot White Light Emitting Diode technology  

E-Print Network (OSTI)

It is well known that the use of high-brightness LEDs for illumination has the potential to substitute conventional lighting and revolutionize the lighting industry over the next 10 to 20 years. However, successful penetration ...

Zhao, Xinyue, M. Eng. Massachusetts Institute of Technology

2006-01-01T23:59:59.000Z

253

A light emitting object and its environment  

E-Print Network (OSTI)

The object that is intentionally produced with the inherent spirit of "Fine Art," will always be placed with a reverence for its setting. "LIGHT GRID" is a light sculpture with flexibility to utilize the environment where ...

Jeibmann, Jon Karl

1983-01-01T23:59:59.000Z

254

APPLICATION NOTE 4393 Selecting HB LED Drivers for Automotive Lighting Applications  

E-Print Network (OSTI)

Abstract: This application note provides an overview of HB LED driver selection criteria for automotive lighting applications. It reviews HB LED driver topologies and recommends configurations for various automotive lighting applications, including interior lighting, exterior lighting, and display backlighting.

Brian Hedayati

2009-01-01T23:59:59.000Z

255

Demonstration Assessment of Light-Emitting Diode Parking Structure Lighting at U.S. Department of Labor Headquarters  

SciTech Connect

This report documents a solid-state lighting (SSL) technology demonstration at the parking structure of the U.S. Department of Labor (DOL) Headquarters in Washington, DC, in which light-emitting diode (LED) luminaires were substituted for the incumbent high-pressure sodium (HPS) luminaires and evaluated for relative light quantity and performance. The demonstration results show energy savings of 52% from the initial conversion of HPS to the LED product. These savings were increased to 88% by using occupancy sensor controls that were ultimately set to reduce power to 10% of high state operation after a time delay of 2.5 minutes. Because of the relatively high cost of the LED luminaires at their time of purchase for this project (2010), the simple payback periods were 6.5 years and 4.9 years for retrofit and new construction scenarios, respectively. Staff at DOL Headquarters reported high satisfaction with the operation of the LED product.

Kinzey, Bruce R.; Myer, Michael

2013-03-01T23:59:59.000Z

256

Battery cell configuration for organic light emitting diode display in modern smartphones and tablet-PCs  

E-Print Network (OSTI)

Battery cell configuration for organic light emitting diode display in modern smartphones- spite of power efficiency of organic light emitting diode (OLED) display nature, the integrated display

Pedram, Massoud

257

High power light emitting diode based setup for photobleaching fluorescent impurities  

E-Print Network (OSTI)

High power light emitting diode based setup for photobleaching fluorescent impurities Tobias K be photobleached before final sample preparation. The instrument consists of high power light emitting diodes

Kaufman, Laura

258

Solid-State Lighting: Text-Alternative Version: Evaluating LED Street  

NLE Websites -- All DOE Office Websites (Extended Search)

Evaluating LED Street Lighting Solutions to someone by E-mail Evaluating LED Street Lighting Solutions to someone by E-mail Share Solid-State Lighting: Text-Alternative Version: Evaluating LED Street Lighting Solutions on Facebook Tweet about Solid-State Lighting: Text-Alternative Version: Evaluating LED Street Lighting Solutions on Twitter Bookmark Solid-State Lighting: Text-Alternative Version: Evaluating LED Street Lighting Solutions on Google Bookmark Solid-State Lighting: Text-Alternative Version: Evaluating LED Street Lighting Solutions on Delicious Rank Solid-State Lighting: Text-Alternative Version: Evaluating LED Street Lighting Solutions on Digg Find More places to share Solid-State Lighting: Text-Alternative Version: Evaluating LED Street Lighting Solutions on AddThis.com... Conferences & Meetings Presentations

259

Growth condition dependence of spin-polarized electroluminescence in Fe/MgO/light-emitting diodes  

SciTech Connect

We compared the electroluminescence (EL) polarization of two Fe/MgO/light-emitting-diode (LED) structures grown at different substrate temperatures for MgO growth: room temperature and 400 deg. C. Two spin-LED wafers were prepared on molecular beam epitaxy grown LEDs by e-beam evaporation: one was LED/MgO (RT)/Fe (RT)/Au cap (RT), and the other was LED/MgO (400 deg. C)/Fe (150 deg. C)/Au cap (90 deg. C). Spin-polarized EL was clearly observed in the latter sample, while the EL polarization was hardly observed in the former sample. The reasons for the near absence of EL polarization in the former sample are considered to be the degradation of the tunneling junction resulting from the crystallinity and the As-rich surface of the LED.

Manago, Takashi; Sinsarp, Asawin; Akinaga, Hiro [Department of Electronics and Computer Science, Tokyo University of Science, Yamaguchi, 1-1-1 Daigaku-Dori, Sanyo-Onoda, Yamaguchi 756-0884 (Japan); Nanotechnology Research Institute (NRI), National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568 (Japan)

2007-10-15T23:59:59.000Z

260

LED ProspectsLED Prospects photometric units  

E-Print Network (OSTI)

for Standardization. #12;1602 8 "kW" means kilowatt. "kWh" means kilowatt-hour. "Light emitting diode (LED)" means a p, material used, and exciting current of the device. The output of a light-emitting diode may be in: (1

Pulfrey, David L.

Note: This page contains sample records for the topic "led light emitting" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Revolutionary Method for Increasing the Efficiency of White Light Quantum Dot LEDs  

SciTech Connect

Covering a light-emitting diode (LED) with quantum dots (QDs) can produce a broad spectrum of white light. However, current techniques for applying QDs to LEDs suffer from a high density of defects and a non-uniform distribution of QDs, which respec-tively diminish the efficiency and quality of emitted light. Oak Ridge National Laboratory (ORNL) has the unique capability to thermally anneal QD structures at extremely high power densities for very short durations. This process, called pulse thermal proc-essing (PTP), reduces the number of point defects while main-taining the size and shape of the original QD nanostructure. Therefore, the efficiency of the QD wavelength conversion layer is improved without altering the emission spectrum defined by the size distribution of the quantum dot nanoparticles. The cur-rent research uses a thermal model to predict annealing tempera-tures during PTP and demonstrates up to a 300% increase in pho-toluminescence for QDs on passive substrates

Duty, Chad E [ORNL; Bennett, Charlee J C [ORNL; Sabau, Adrian S [ORNL; Jellison Jr, Gerald Earle [ORNL; Boudreaux, Philip R [ORNL; Walker, Steven C [ORNL; Ott, Ronald D [ORNL

2011-01-01T23:59:59.000Z

262

Optical switching in midinfrared light-emitting diodes  

Science Conference Proceedings (OSTI)

We report on the optical quenching of electroluminescence in midinfrared light-emitting diodes operating at 3.0 ?m. The source is based on a symmetrical double heterostructure with large band offsets and is effectively switched off using coherent visible light.

A. Krier; V. V. Sherstnev; H. H. Gao; A. M. Monahov; G. Hill

2002-01-01T23:59:59.000Z

263

Oxycarbonitride phosphors and light emitting devices using the same  

DOE Patents (OSTI)

Disclosed herein is a novel family of oxycarbidonitride phosphor compositions and light emitting devices incorporating the same. Within the sextant system of M--Al--Si--O--N--C--Ln and quintuplet system of M--Si--O--N--C--Ln (M=alkaline earth element, Ln=rare earth element), the phosphors are composed of either one single crystalline phase or two crystalline phases with high chemical and thermal stability. In certain embodiments, the disclosed phosphor of silicon oxycarbidonitrides emits green light at wavelength between 530-550 nm. In further embodiments, the disclosed phosphor compositions emit blue-green to yellow light in a wavelength range of 450-650 nm under near-UV and blue light excitation.

Li, Yuanqiang; Romanelli, Michael Dennis; Tian, Yongchi

2013-10-08T23:59:59.000Z

264

Power control architectures for cold cathode fluorescent lamp and light emitting diode based light sources.  

E-Print Network (OSTI)

?? In this dissertation, two different energy efficient power supply topologies are introduced for controlling cold cathode fluorescent lamp (CCFL) and high-brightness light emitting diode… (more)

Doshi, Montu V.

2010-01-01T23:59:59.000Z

265

Series Input Modular Architecture for Driving Multiple LEDs  

E-Print Network (OSTI)

, where each cell drives four 700 mA LEDs. Keywords ­ solid-state lighting, light emitting diodes, LED have been achieved over the past decade in solid state light emitting diodes (LEDs), leading to high, L. Zhou, G. Harbers, and M. Craford, "Status and future of high-power light-emitting diodes

266

The Josephson light-emitting diode  

E-Print Network (OSTI)

We consider an optical quantum dot where an electron level and a hole level are coupled to respective superconducting leads. We find that electrons and holes recombine producing photons at discrete energies as well as a continuous tail. Further, the spectral lines directly probe the induced superconducting correlations on the dot. At energies close to the applied bias voltage eV, a parameter range exists, where radiation proceeds in pairwise emission of polarization correlated photons. At energies close to 2eV, emitted photons are associated with Cooper pair transfer and are reminiscent of Josephson radiation. We discuss how to probe the coherence of these photons in a SQUID geometry via single photon interference.

Patrik Recher; Yuli V. Nazarov; Leo P. Kouwenhoven

2009-02-25T23:59:59.000Z

267

Lighting Controls | Department of Energy  

NLE Websites -- All DOE Office Websites (Extended Search)

fluorescent lighting fixtures rather than replace them. Dimmers and LEDs Some light-emitting diode (LED) lightbulbs can be used with dimmers. LED bulbs and fixtures must be...

268

Low level light therapy by Red---Green---Blue LEDs improves healing in an excision model of Sprague---Dawley rats  

Science Conference Proceedings (OSTI)

There are many methods of healing wounds. Among these, light therapy is reported to be beneficial, as beams assist the human body in treating, sterilizing, and regenerating cells. Both Laser and LED irradiation with specific wavelengths induce proliferation ... Keywords: Epithelialization, Light emitting diode, Light therapy, Photobiomodulation, Photostimulation

Min Woo Cheon, Tae Gon Kim, Yang Sun Lee, Seong Hwan Kim

2013-10-01T23:59:59.000Z

269

Close-packed array of light emitting devices  

SciTech Connect

A close-packed array of light emitting diodes includes a nonconductive substrate having a plurality of elongate channels extending therethrough from a first side to a second side, where each of the elongate channels in at least a portion of the substrate includes a conductive rod therein. The conductive rods have a density over the substrate of at least about 1,000 rods per square centimeter and include first conductive rods and second conductive rods. The close-packed array further includes a plurality of light emitting diodes on the first side of the substrate, where each light emitting diode is in physical contact with at least one first conductive rod and in electrical contact with at least one second conductive rod.

Ivanov, Ilia N.; Simpson, John T.

2013-04-09T23:59:59.000Z

270

Thermal And Mechanical Analysis of High-power Light-emitting Diodes with Ceramic Packages  

E-Print Network (OSTI)

In this paper we present the thermal and mechanical analysis of high-power light-emitting diodes (LEDs) with ceramic packages. Transient thermal measurements and thermo-mechanical simulation were performed to study the thermal and mechanical characteristics of ceramic packages. Thermal resistance from the junction to the ambient was decreased from 76.1 oC/W to 45.3 oC/W by replacing plastic mould to ceramic mould for LED packages. Higher level of thermo-mechanical stresses in the chip were found for LEDs with ceramic packages despite of less mismatching coefficients of thermal expansion comparing with plastic packages. The results suggest that the thermal performance of LEDs can be improved by using ceramic packages, but the mounting process of the high power LEDs with ceramic packages is critically important and should be in charge of delaminating interface layers in the packages.

J. Hu; L. Yang; M. -W. Shin

2008-01-07T23:59:59.000Z

271

Sliding Mode Pulsed Averaging IC Drivers for High Brightness Light Emitting Diodes  

SciTech Connect

This project developed new Light Emitting Diode (LED) driver ICs associated with specific (uniquely operated) switching power supplies that optimize performance for High Brightness LEDs (HB-LEDs). The drivers utilize a digital control core with a newly developed nonlinear, hysteretic/sliding mode controller with mixed-signal processing. The drivers are flexible enough to allow both traditional microprocessor interface as well as other options such as “on the fly” adjustment of color and brightness. Some other unique features of the newly developed drivers include • AC Power Factor Correction; • High power efficiency; • Substantially fewer external components should be required, leading to substantial reduction of Bill of Materials (BOM). Thus, the LED drivers developed in this research : optimize LED performance by increasing power efficiency and power factor. Perhaps more remarkably, the LED drivers provide this improved performance at substantially reduced costs compared to the present LED power electronic driver circuits. Since one of the barriers to market penetration for HB-LEDs (in particular “white” light LEDs) is cost/lumen, this research makes important contributions in helping the advancement of SSL consumer acceptance and usage.

Dr. Anatoly Shteynberg, PhD

2006-08-17T23:59:59.000Z

272

LED Update  

SciTech Connect

This article, which will appear in RESIDENTIAL LIGHTING MAGAZINE, interviews PNNL's Kelly Gordon and presents the interview in question and answer format. The topic is a light emitting diode (LED) lighting also known as solid state lighting. Solid state lighting will be a new category in an energy efficient lighting fixture design competition called Lighting for Tomorrow sponsored by the US Department of Energy Emerging Technologies Office, the American Institute for Lighting, and the Consortium for Energy Efficiency. LED technology has been around since the ’60s, but it has been used mostly for indicator lights on electronics equipment. The big breakthrough was the development in the 1990s of blue LEDs which can be combined with the red and green LEDs that already existed to make white light. LEDs produce 25 to 40 lumens of light per watt of energy used, almost as much as a CFL (50 lumens per watt) and much more efficient than incandescent sources, which are around 15 lumens per watt. They are much longer lived and practical in harsh environments unsuitable for incandescent lighting. They are ready for niche applications now, like under-counter lighting and may be practical for additional applications as technological challenges are worked out and the technology is advancing in leaps and bounds.

Johnson, Mark L.; Gordon, Kelly L.

2006-09-01T23:59:59.000Z

273

Amber LEDs for Solid-State Lighting: White light with unprecendented efficiencies  

NLE Websites -- All DOE Office Websites (Extended Search)

Amber LEDs for Solid-State Lighting: Amber LEDs for Solid-State Lighting: White light with unprecedented efficiencies Commercialization Webinar December 10, 2013 2 Agenda for Today's Webinar * Welcome/Logistics * Technology Overview * Commercialization Opportunity * Q&A 3 Presenters Yoriko Morita, PhD MBA licensing manager Kirstin Alberi, PhD inventor 4 Technology Overview * Background/Context * Limitations NREL's Technology Addresses o Substrate material o Efficiency o Manufacturing * Performance Testing Results * Summary of Benefits/Advantages NREL is a national laboratory of the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, operated by the Alliance for Sustainable Energy, LLC. Amber LEDs for Solid-State Lighting: White light with unprecedented efficiencies

274

Light output enhancement of InGaN/GaN light-emitting diodes with contrasting indium tin-oxide nanopatterned structures  

Science Conference Proceedings (OSTI)

Various nanopatterns on the transparent conducting indium tin oxide (ITO) layer are investigated to enhance the light extraction efficiency of the InGaN/GaN light-emitting diodes (LEDs). Triangular, square, and circular nanohole patterns with the square ...

Sang Hyun Jung, Keun Man Song, Young Su Choi, Hyeong-Ho Park, Hyun-Beom Shin, Ho Kwan Kang, Jaejin Lee

2013-01-01T23:59:59.000Z

275

A RUGGED LED-BASED SENSOR FOR AIRCRAFT FIRE ...  

Science Conference Proceedings (OSTI)

... a novel. low-weight, Light Emitting Diode (LED)-based optical absorption spectroscopy technique for fire detection. This ...

2011-12-14T23:59:59.000Z

276

Keeping Pace with LED Lighting Trends | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

and DOE's national laboratories. Topics include: Cost-effectiveness analyses and price projections Advances in LED chips, product designs, and optics LED adoption trends...

277

LED Surgical Task Lighting Scoping Study: A Hospital Energy Alliance Project  

SciTech Connect

Tungsten-halogen (halogen) lamps have traditionally been used to light surgical tasks in hospitals, even though they are in many respects ill-suited to the application due to the large percentage of radiant energy outside the visible spectrum and issues with color rendering/quality. Light-emitting diode (LED) technology offers potential for adjustable color and improved color rendition/quality, while simultaneously reducing side-effects from non-visible radiant energy. It also has the potential for significant energy savings, although this is a fairly narrow application in the larger commercial building energy use sector. Based on analysis of available products and Hospital Energy Alliance member interest, it is recommended that a product specification and field measurement procedure be developed for implementation in demonstration projects.

Tuenge, Jason R.

2011-01-17T23:59:59.000Z

278

Design of an efficient light-emitting diode with 10 GHz modulation bandwidth  

Science Conference Proceedings (OSTI)

We present a high-speed light-emitting-diode (LED) design for efficient modulation at speeds higher than 10 GHz. It relies on a tensile-strain GaAsPquantum well coupled with surface plasmon polaritons on a silversurface. We present optical pumping experiments showing a tenfold reduction in carrier lifetime when the quantum well is located 40 nm above the silversurface. We believe this represents the first step toward an efficient LED compatible with 10 GHz modulation speed for use in short distance optical communication systems.

D. Fattal; M. Fiorentino; M. Tan; D. Houng; S. Y. Wang; Raymond G. Beausoleil

2008-01-01T23:59:59.000Z

279

Thermoelectrically Pumped Light-Emitting Diodes Operating above Unity Efficiency  

E-Print Network (OSTI)

A heated semiconductor light-emitting diode at low forward bias voltage V

Santhanam, Parthiban

280

Interplay between multiple scattering, emission, and absorption of light in the phosphor of a white light-emitting diode  

E-Print Network (OSTI)

We study light transport in phosphor plates of white light-emitting diodes (LEDs). We measure the broadband diffuse transmission through phosphor plates of varying YAG:Ce$^{3+}$ density. We distinguish the spectral ranges where absorption, scattering, and re-emission dominate. Using diffusion theory, we derive the transport and absorption mean free paths from first principles. We find that both transport and absorption mean free paths are on the order of the plate thickness. This means that phosphors in commercial LEDs operate well within an intriguing albedo range around 0.7. We discuss how salient parameters that can be derived from first principles control the optical properties of a white LED.

Leung, V Y F; Tukker, T W; Mosk, A P; IJzerman, W L; Vos, W L

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "led light emitting" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Assessing the Performance of 5mm White LED Light Sources for Developing-Country Applications  

E-Print Network (OSTI)

Stewart Craine collected the LED samples in Shenzen, China4. Variation in efficacy of LEDs tested. Figure 5. Figure 6.Performance of 5mm White LED Light Sources for Developing-

Mills, Evan

2007-01-01T23:59:59.000Z

282

Green Light-Emitting Diode Makes Highly Efficient White Light; The Spectrum of Clean Energy Innovation (Fact Sheet)  

SciTech Connect

Fact sheet describing NREL's green light emitting diode that can lead to higher efficiency white light used in indoor lighting applications.

2010-06-01T23:59:59.000Z

283

LED for vei- og gatebelysning; LED for Street and Road Lighting.  

E-Print Network (OSTI)

?? Denne masteroppgaven har som formĺl ĺ finne ut av om LED er egnet til vei- og gatebelysning. Analysen baserer seg pĺ ulike mĺlinger gjort… (more)

Heide, Jřrgen Anker-Rasch

2011-01-01T23:59:59.000Z

284

What is the appropriate way to show LED lighting in COMcheck...  

NLE Websites -- All DOE Office Websites (Extended Search)

Policies Glossary Related Links ACE Learning Series What is the appropriate way to show LED lighting in COMcheck? The following steps should be used to account for LED lighting in...

285

Energy Savings Estimates of Light Emitting Diodes in Niche Lighting...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

in Niche Lighting Applications Prepared for: Building Technologies Program Office of Energy Efficiency and Renewable Energy U.S. Department of Energy Prepared by: Navigant...

286

Nanocrystalline Silicon Quantum Dot Light Emitting Diodes Using Metal Oxide Charge Transport Layers.  

E-Print Network (OSTI)

??Silicon-based lighting show promise for display and solid state lighting use. Here we demonstrate a novel thin film light emitting diode device using nanocrystalline silicon… (more)

Zhu, Jiayuan

2013-01-01T23:59:59.000Z

287

Semiconductor Nanocrystals-Based White Light Emitting Diodes  

Science Conference Proceedings (OSTI)

In response to the demands for energy and the concerns of global warming and climate change, energy efficient and environmentally friendly solid state lighting, such as white light emitting diodes (WLEDs), is considered to be the most promising and suitable light source. Because of their small size, high efficiency, and long lifetime, WLEDs based on colloidal semiconductor nanocrystals (or quantum dots) are emerging as a completely new technology platform for the development of flat-panel displays and solid state lighting, exhibiting the potential to replace the conventionally used incandescent and fluorescent lamps. This replacement could cut the ever-increasing energy consumption, solve the problem of rapidly depleting fossil fuel reserves, and improve the quality of the global environment. In this review, we highlight the recent progress in semiconductor nanocrystals-based WLEDs, compare different approaches for generating white light, and discuss the benefits and challenges of the solid state lighting technology.

Dai, Quanqin [ORNL; Hu, Michael Z. [ORNL; Duty, Chad E [ORNL

2010-01-01T23:59:59.000Z

288

Arnold Schwarzenegger LIGHTING RESEARCH PROGRAM  

E-Print Network (OSTI)

Project Summaries ELEMENT 2: ADVANCE LIGHTING TECHNOLOGIES PROJECT 2.1 LIGHT EMITTING DIODE (LED light emitting diodes (LED) technology for general lighting applications by developing a task lamp

289

Caratteristiche, qualitŕ e cromaticitŕ della luce a LED. Features, quality and chromaticity of the LED light.  

E-Print Network (OSTI)

??Un LED č un diodo che emette luce monocromatica per l’occhio, la quale, in base alla sensibilitŕ dell’occhio umano, presenta una qualitŕ e una cromaticitŕ… (more)

Rizzato, Vanessa

2013-01-01T23:59:59.000Z

290

LightBox -Exploring Interaction Modalities with Colored Light  

E-Print Network (OSTI)

-bright multi- colored light-emitting diodes (LEDs) of our system can generate any visible lighting color

291

High power light emitting diode based setup for photobleaching fluorescent impurities  

E-Print Network (OSTI)

High power light emitting diode based setup for photobleaching fluorescent impurities Tobias K be photobleached before final sample preparation. The instrument consists of high power light emitting diodes for simple photobleaching pur- poses, we designed a simple but efficient lighting system using light emitting

Kaufman, Laura

292

Point defect engineered Si sub-bandgap light-emitting diode  

E-Print Network (OSTI)

Point defect engineered Si sub-bandgap light-emitting diode Jiming Bao1 , Malek Tabbal1,2 , Taegon light emission in Si and demonstrate a sub-bandgap light emitting diode based on the introduction.3670) Light-emitting diodes; (160.6000) Semiconductors; (130-0250) Optoelectronics. References and links 1. S

293

Solid-State Lighting: Text-Alternative Version: LEDs for Interior Office  

NLE Websites -- All DOE Office Websites (Extended Search)

LEDs LEDs for Interior Office Applications to someone by E-mail Share Solid-State Lighting: Text-Alternative Version: LEDs for Interior Office Applications on Facebook Tweet about Solid-State Lighting: Text-Alternative Version: LEDs for Interior Office Applications on Twitter Bookmark Solid-State Lighting: Text-Alternative Version: LEDs for Interior Office Applications on Google Bookmark Solid-State Lighting: Text-Alternative Version: LEDs for Interior Office Applications on Delicious Rank Solid-State Lighting: Text-Alternative Version: LEDs for Interior Office Applications on Digg Find More places to share Solid-State Lighting: Text-Alternative Version: LEDs for Interior Office Applications on AddThis.com... Conferences & Meetings Presentations Publications

294

Solid-State Lighting: LED Replacement Lamps: Current Performance and the  

NLE Websites -- All DOE Office Websites (Extended Search)

LED Replacement Lamps: Current LED Replacement Lamps: Current Performance and the Latest on ENERGY STAR® to someone by E-mail Share Solid-State Lighting: LED Replacement Lamps: Current Performance and the Latest on ENERGY STAR® on Facebook Tweet about Solid-State Lighting: LED Replacement Lamps: Current Performance and the Latest on ENERGY STAR® on Twitter Bookmark Solid-State Lighting: LED Replacement Lamps: Current Performance and the Latest on ENERGY STAR® on Google Bookmark Solid-State Lighting: LED Replacement Lamps: Current Performance and the Latest on ENERGY STAR® on Delicious Rank Solid-State Lighting: LED Replacement Lamps: Current Performance and the Latest on ENERGY STAR® on Digg Find More places to share Solid-State Lighting: LED Replacement Lamps: Current Performance and the Latest on ENERGY STAR® on

295

Organic light-emitting diodes from homoleptic square planar complexes  

SciTech Connect

Homoleptic square planar complexes [M(N.LAMBDA.N).sub.2], wherein two identical N.LAMBDA.N bidentate anionic ligands are coordinated to the M(II) metal center, including bidentate square planar complexes of triazolates, possess optical and electrical properties that make them useful for a wide variety of optical and electrical devices and applications. In particular, the complexes are useful for obtaining white or monochromatic organic light-emitting diodes ("OLEDs"). Improved white organic light emitting diode ("WOLED") designs have improved efficacy and/or color stability at high brightness in single- or two-emitter white or monochrome OLEDs that utilize homoleptic square planar complexes, including bis[3,5-bis(2-pyridyl)-1,2,4-triazolato]platinum(II) ("Pt(ptp).sub.2").

Omary, Mohammad A

2013-11-12T23:59:59.000Z

296

Growths of staggered InGaN quantum wells light-emitting diodes emitting at 520525 nm employing graded growth-temperature profile  

E-Print Network (OSTI)

Growths of staggered InGaN quantum wells light-emitting diodes emitting at 520­525 nm employing current spreading and light extraction in GaN-based light emitting diodes Appl. Phys. Lett. 100, 061107 (2012) Electrically driven nanopyramid green light emitting diode Appl. Phys. Lett. 100, 061106 (2012

Gilchrist, James F.

297

Organic light emitting device having multiple separate emissive layers  

DOE Patents (OSTI)

An organic light emitting device having multiple separate emissive layers is provided. Each emissive layer may define an exciton formation region, allowing exciton formation to occur across the entire emissive region. By aligning the energy levels of each emissive layer with the adjacent emissive layers, exciton formation in each layer may be improved. Devices incorporating multiple emissive layers with multiple exciton formation regions may exhibit improved performance, including internal quantum efficiencies of up to 100%.

Forrest, Stephen R. (Ann Arbor, MI)

2012-03-27T23:59:59.000Z

298

Measured Off-Grid LED Lighting System Performance  

E-Print Network (OSTI)

The Specter of Fuel-Based Lighting," Science 308:1263-1264.Mills. 2008. "Solid-State Lighting on a Shoestring Budget:The Economics of Off-Grid Lighting for Small Businesses in

Granderson, Jessica

2009-01-01T23:59:59.000Z

299

Note: A portable, light-emitting diode-based ruby fluorescence spectrometer for high-pressure calibration  

SciTech Connect

Ruby (Al{sub 2}O{sub 3}, with {approx}0.5 wt. % Cr doping) is one of the most widely used manometers at the giga-Pascal scale. Traditionally, its fluorescence is excited with intense laser sources. Here, I present a simple, robust, and portable design that employs light-emitting diodes (LEDs) instead. This LED-based system is safer in comparison with laser-based ones.

Feng Yejun [Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439 (United States)

2011-04-15T23:59:59.000Z

300

Standards Set for Energy-Conserving LED Lighting  

Science Conference Proceedings (OSTI)

... standard LM-79, which describes the methods for testing solid-state lighting products for their light output (lumens), energy efficiency (lumens per ...

2011-05-03T23:59:59.000Z

Note: This page contains sample records for the topic "led light emitting" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Electroluminescence property of organic light emitting diode (OLED)  

Science Conference Proceedings (OSTI)

Transport properties of electrons and holes were investigated not only in a anthracene-containing poly(p-phenylene-ethynylene)- alt - poly(p-phenylene-vinylene) (PPE-PPV) polymer (AnE-PVstat) light emitting diodes (OLED) but also in an ITO/Ag/polymer/Ag electron and ITO/PEDOT:PSS/polymer/Au hole only devices. Mobility of injected carriers followed the Poole-Frenkel type conduction mechanism and distinguished in the frequency range due to the difference of transit times in admittance measurement. Beginning of light output took place at the turn-on voltage (or flat band voltage)

2013-01-01T23:59:59.000Z

302

Metameric Modulation for Diffuse Visible Light Communications with Constant Ambient Lighting  

E-Print Network (OSTI)

untapped for wireless communications. Advancements in light emitting diode (LED) technology are making

Little, Thomas

303

Development of ZnO Based Light Emitting Diodes and Laser Diodes.  

E-Print Network (OSTI)

??ZnO based homojunction light emitting diode, double heterojunction light emitting diode, embedded heterojunction random laser diode and Fabry-Perot nanowire laser devices were fabricated and characterized.… (more)

Kong, Jieying

2012-01-01T23:59:59.000Z

304

White organic light-emitting diodes: Status and perspective  

E-Print Network (OSTI)

White organic light-emitting diodes (OLEDs) are ultra-thin, large-area light sources made from organic semiconductor materials. Over the last decades, much research has been spent on finding the suitable materials to realize highly efficient monochrome and white OLEDs. With their high efficiency, color-tunability, and color-quality, white OLEDs are emerging to become one of the next generation light sources. In this review, we discuss the physics of a variety of device concepts that are introduced to realize white OLEDs based on both polymer and small molecule organic materi als. Owing to the fact that about 80 % of the internally generated photons are trapped within the thin-film layer structure, we put a second focus on reviewing promising concepts for improved light outcoupling.

Reineke, Sebastian; Lüssem, Björn; Leo, Karl

2013-01-01T23:59:59.000Z

305

Intramolecular excimer emission as a blue light source in fluorescent organic light emitting diodes: a promising molecular design  

E-Print Network (OSTI)

Intramolecular excimer emission as a blue light source in fluorescent organic light emitting diodes Light Emitting Diode (OLED), intermolecular p­p interactions should be usually suppressed to avoid any Emitting Diodes (SMOLEDs) is almost absent from the literature. In this work, three aryl-substituted Di

306

Using light emitting diode arrays as touchsensitive input and output devices  

E-Print Network (OSTI)

Light Emitting Diodes (LEDs) offer long life, low cost, efficiency, brightness, and a full range of colors. Because of these properties, they are widely used for simple displays in electronic devices. A previously characterized, but little known property of LEDs allows them to be used as photo sensors. In this paper, we show how this capability can be used to turn unmodified, off the shelf, LED arrays into touch sensitive input devices (while still remaining capable of producing output). The technique is simple and requires little or no extra hardware – in some cases operating with the same micro-controller based circuitry normally used to produce output, requiring only software changes. We will describe a simple hybrid input/output device prototype implemented with this technique, and discuss the design opportunities that this type of device opens up. Categories and Subject Descriptors:

Scott E. Hudson

2004-01-01T23:59:59.000Z

307

Illuminating Solar Decathlon Homes: Exploring Next Generation Lighting Technology - Light Emitting Diodes  

DOE Green Energy (OSTI)

This report was prepared by PNNL for the US Department of Energy Building Technologies Program, Solid-State Lighting Program. The report will be provided to teams of university students who are building houses for the 2009 Solar Decathlon, a home design competition sponsored in part by DOE, to encourage teams to build totally solar powered homes. One aspect of the competition is lighting. This report provides the teams with information about LED lighting that can help them determine how they incorporate LED lighting into their homes. The report provides an overview of LED technology, a status of where LED technology is today, questions and answers about lighting quality, efficiency, lifetime etc.; numerous examples of LED products; and several weblinks for further research.

Gordon, Kelly L.; Gilbride, Theresa L.

2008-05-22T23:59:59.000Z

308

Demonstration Assessment of Light-Emitting Diode Roadway Lighting on the FDR Drive in New York, New York  

SciTech Connect

This a report about a field study of light-emitting diodes street lights by four different manufacturers installed on the FDR Drive in New York City, NY.

Myer, Michael; Hazra, Oindrila; Kinzey, Bruce R.

2011-12-01T23:59:59.000Z

309

High Bandgap Phosphide Approaches for LED Applications ...  

Light emitting diodes (LEDs) ... The U.S. Department of Energy expects to phase out tungsten bulbs by 2014, and compact fluorescents by 2020, ...

310

Investigation on Operating Characteristics of RGB LEDs.  

E-Print Network (OSTI)

??This thesis seeks to gain a better understanding on operating characteristics of the three primary color light emitting diode (LED). By applying direct, pulse and… (more)

Liao, Chi-nan

2007-01-01T23:59:59.000Z

311

Improvement of output coupling efficiency of organic light-emitting diodes by backside substrate modification  

E-Print Network (OSTI)

Improvement of output coupling efficiency of organic light-emitting diodes by backside substrate in determining the power efficiency of organic light emitting diodes OLEDs is the coupling effi- ciency ( cp 1999; accepted for publication 1 February 2000 The emission intensity of an organic light-emitting

312

Solvent-enhanced dye diffusion in polymer thin films for polymer light-emitting diode application  

E-Print Network (OSTI)

Solvent-enhanced dye diffusion in polymer thin films for polymer light-emitting diode application-color (red, green, and blue) polymer light-emitting diode displays was investigated in detail. After local.1063/1.1806548] I. INTRODUCTION Polymer light-emitting diodes (PLEDs) have emerged as a very promising candidate

313

Local tuning of organic light-emitting diode color by dye droplet application  

E-Print Network (OSTI)

Local tuning of organic light-emitting diode color by dye droplet application T. R. Hebner and J. C and the spectra of organic light-emitting diodes made from these films can be successfully tuned by this method. S0003-6951 98 01339-4 A main goal of the field of organic light-emitting diodes OLEDs

314

Room temperature 1.6 m electroluminescence from Ge light emitting diode on Si substrate  

E-Print Network (OSTI)

Room temperature 1.6 µm electroluminescence from Ge light emitting diode on Si substrate Szu n+/p light emitting diode on a Si substrate. Unlike normal electrically pumped devices, this device.4670) Optical materials; (230.3670) Light-emitting diodes. References and links 1. L. C. Kimerling, "Silicon

Vuckovic, Jelena

315

High efficiency light emitting diode with anisotropically etched GaN-sapphire interface  

E-Print Network (OSTI)

High efficiency light emitting diode with anisotropically etched GaN- sapphire interface M. H. Lo and optimization of a light-emitting diode projection micro-stereolithography three-dimensional manufacturingGaN micro-light emitting diodes Appl. Phys. Lett. 101, 231110 (2012) A bright cadmium-free, hybrid organic

316

Far-field radiation of photonic crystal organic light-emitting diode  

E-Print Network (OSTI)

Far-field radiation of photonic crystal organic light-emitting diode Yong-Jae Lee, Se-Heon Kim, Guk-field profile of a photonic crystal organic light emitting diode is studied to understand the viewing angle.3670) Light- emitting diodes References and links 1. M. R. Krames, H. Amano, J. J. Brown, P. L. Heremans

Lee, Yong-Hee

317

Enhancement of Barrier Properties Using Ultrathin Hybrid Passivation Layer for Organic Light Emitting Diodes  

E-Print Network (OSTI)

acrylate layer and MS-31 (MgO : SiO2 ÂĽ 3 : 1 wt %) layer was adopted in organic light emitting diode (OLED the penetrations of oxygen and moisture. [DOI: 10.1143/JJAP.45.5970] KEYWORDS: organic light emitting diode (OLED. Introduction As a next generation display, the organic light emitting diode (OLED) has to great performances

Hwang, Sung Woo

318

Correlation between the Indium Tin Oxide morphology and the performances of polymer light-emitting diodes  

E-Print Network (OSTI)

: This paper reports on performance enhancement of polymer light-emitting diodes (PLEDs) based on poly(2,5-bis. Keywords : Polymer light emitting diode; Indium tin oxide; Atomic force microscopy; Rutherford backscattering spectroscopy 1. Introduction Polymer light-emitting diodes (PLEDs) have received worldwide

Paris-Sud XI, Université de

319

Poly(p-phenylene vinylene)/tris(8-hydroxy) quinoline aluminum heterostructure light emitting diode  

E-Print Network (OSTI)

Poly(p-phenylene vinylene)/tris(8-hydroxy) quinoline aluminum heterostructure light emitting diode are presented from polymer/molecular organic heterostructure light emitting diodes composed of a layer,2 organic light emitting diodes OLEDs utilizing fluorescent molecules have attracted considerable interest

320

Solid-State Lighting: The City of Los Angeles LED Streetlight...  

NLE Websites -- All DOE Office Websites (Extended Search)

The City of Los Angeles LED Streetlight Program to someone by E-mail Share Solid-State Lighting: The City of Los Angeles LED Streetlight Program on Facebook Tweet about Solid-State...

Note: This page contains sample records for the topic "led light emitting" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

A Novel Hole-Confining Concept for Efficient Green Organic Light Emitting Diodes.  

E-Print Network (OSTI)

??Organic light emitting diode (OLED) technology has initiated a lot of interest in the display and solid state lighting market during the last decade. The… (more)

Harikrishna Mohan, Siddharth

2008-01-01T23:59:59.000Z

322

Assessing the Performance of LED-Based Flashlights Available in the Kenyan Off-Grid Lighting Market  

E-Print Network (OSTI)

of emerging off-grid White-LED illumination systems, Light &Assessing the Performance of LED-Based Flashlights Availableflashlights that use LED technology are increasingly

Tracy, Jennifer

2010-01-01T23:59:59.000Z

323

Department of Electrical Engineering Spring 2012 Boeing LED Strobe Light System  

E-Print Network (OSTI)

strobe light system used by Boeing. The current Xenon bulb system is bulky, inefficient, and unreliable other light bulbs, this improves the longevity of the device Excellent frequency response of the LEDsPENNSTATE Department of Electrical Engineering Spring 2012 Boeing LED Strobe Light System Overview

Demirel, Melik C.

324

Diode (LED) Fixture Design and Installation Criteria for Interior and Exterior Lighting Applications  

E-Print Network (OSTI)

1. Purpose. This ETL provides technical guidance and criteria for specifying, designing, and installing LED luminaires for interior and exterior lighting applications at Air Force installations. This ETL does not apply to LED airfield lighting systems, including, but not limited to, taxiway, obstruction, runway edge, threshold, or approach lighting systems

unknown authors

2010-01-01T23:59:59.000Z

325

Slideshow: Flipping the Switch on LED Lighting for the National Mall |  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Slideshow: Flipping the Switch on LED Lighting for the National Slideshow: Flipping the Switch on LED Lighting for the National Mall Slideshow: Flipping the Switch on LED Lighting for the National Mall January 31, 2012 - 3:05pm Addthis 1 of 8 Facing East toward the Capitol Building, LED retrofitted lights line the interior paths of the mall while preserving the architectural integrity of the original fixtures. Image: Energy Department Image | Photo by Quentin Kruger (Contractor) | Public Domain Date taken: 2012-01-30 06:00 2 of 8 Energy Secretary Steven Chu discusses the 65% savings on electric bills and lowered maintenance costs the National Parks Service is experiencing by switching to energy efficient LED lights. "Using energy-efficient LED light bulbs is an important way Americans can save money by saving energy," said

326

Solid-State Lighting: Text-Alternative Version: Successful Selection of LED  

NLE Websites -- All DOE Office Websites (Extended Search)

Text-Alternative Version: Text-Alternative Version: Successful Selection of LED Streetlight Luminaires Webcast to someone by E-mail Share Solid-State Lighting: Text-Alternative Version: Successful Selection of LED Streetlight Luminaires Webcast on Facebook Tweet about Solid-State Lighting: Text-Alternative Version: Successful Selection of LED Streetlight Luminaires Webcast on Twitter Bookmark Solid-State Lighting: Text-Alternative Version: Successful Selection of LED Streetlight Luminaires Webcast on Google Bookmark Solid-State Lighting: Text-Alternative Version: Successful Selection of LED Streetlight Luminaires Webcast on Delicious Rank Solid-State Lighting: Text-Alternative Version: Successful Selection of LED Streetlight Luminaires Webcast on Digg Find More places to share Solid-State Lighting: Text-Alternative

327

Slideshow: Flipping the Switch on LED Lighting for the National Mall |  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Slideshow: Flipping the Switch on LED Lighting for the National Slideshow: Flipping the Switch on LED Lighting for the National Mall Slideshow: Flipping the Switch on LED Lighting for the National Mall January 31, 2012 - 3:05pm Addthis 1 of 8 Facing East toward the Capitol Building, LED retrofitted lights line the interior paths of the mall while preserving the architectural integrity of the original fixtures. Image: Energy Department Image | Photo by Quentin Kruger (Contractor) | Public Domain Date taken: 2012-01-30 06:00 2 of 8 Energy Secretary Steven Chu discusses the 65% savings on electric bills and lowered maintenance costs the National Parks Service is experiencing by switching to energy efficient LED lights. "Using energy-efficient LED light bulbs is an important way Americans can save money by saving energy," said

328

Solid-State Lighting: Text-Alternative Version: Model Specification for LED  

NLE Websites -- All DOE Office Websites (Extended Search)

Information Information Resources Printable Version Share this resource Send a link to Solid-State Lighting: Text-Alternative Version: Model Specification for LED Roadway Luminaires Webcast to someone by E-mail Share Solid-State Lighting: Text-Alternative Version: Model Specification for LED Roadway Luminaires Webcast on Facebook Tweet about Solid-State Lighting: Text-Alternative Version: Model Specification for LED Roadway Luminaires Webcast on Twitter Bookmark Solid-State Lighting: Text-Alternative Version: Model Specification for LED Roadway Luminaires Webcast on Google Bookmark Solid-State Lighting: Text-Alternative Version: Model Specification for LED Roadway Luminaires Webcast on Delicious Rank Solid-State Lighting: Text-Alternative Version: Model Specification for LED Roadway Luminaires Webcast on Digg

329

Edmund G. Brown Jr. LIGHTING CALIFORNIA'S FUTURE  

E-Print Network (OSTI)

. Keywords: Solidstate lighting, LED, light emitting diode, indirect downlight, energy efficiency #12;viii, advanced light emitting diode downlighting system. Performance objectives included compliance with ENERGY an advanced light emitting diode downlight system, retooling the traditional downlight and optimizing

330

Lighting offices with LEDs: A study on retrofitting solutions.  

E-Print Network (OSTI)

??Global energy consumption is rising and the relative contribution of lighting in buildings to that total is also increasing. In offices, the dominant form of… (more)

Stravoravdis, Spyridon

2013-01-01T23:59:59.000Z

331

What Do You Think of Your LED Holiday Lights? | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

What Do You Think of Your LED Holiday Lights? What Do You Think of Your LED Holiday Lights? What Do You Think of Your LED Holiday Lights? December 23, 2010 - 6:30am Addthis This year, we've been encouraging people to switch to LED light strings for their holiday decorations. With the many options for shapes, colors, and sizes, people are discovering that they like or dislike various aspects of the lights. One of the biggest things to like, of course, is the major energy savings, but some folks have also discovered that the lights have a slightly different color or reflect off of ornaments in a different way. Change can be difficult, especially when we've been seeing the same types of decorations for so many years, but we hope that you've made the switch and are enjoying the savings and festivity that LED lights can add to your

332

What Do You Think of Your LED Holiday Lights? | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Think of Your LED Holiday Lights? Think of Your LED Holiday Lights? What Do You Think of Your LED Holiday Lights? December 23, 2010 - 6:30am Addthis This year, we've been encouraging people to switch to LED light strings for their holiday decorations. With the many options for shapes, colors, and sizes, people are discovering that they like or dislike various aspects of the lights. One of the biggest things to like, of course, is the major energy savings, but some folks have also discovered that the lights have a slightly different color or reflect off of ornaments in a different way. Change can be difficult, especially when we've been seeing the same types of decorations for so many years, but we hope that you've made the switch and are enjoying the savings and festivity that LED lights can add to your

333

New family of tiny crystals glow bright in LED lights | ornl...  

NLE Websites -- All DOE Office Websites (Extended Search)

| ORNL | News | Features SHARE News Feature New family of tiny crystals glow bright in LED lights ORNL scientist probes atomic structure to improve materials' luminescence...

334

Development of an LED reference light source for calibration of radiographic imaging detectors  

E-Print Network (OSTI)

A stable reference light source based on an LED (Light Emission Diode) is presented for stabilizing the conversion gain of the opto-electronic system of a gamma- and fast-neutron radiographic and tomographic imaging device. A constant fraction of the LED light is transported to the image plane of the camera and provides a stable reference exposure. This is used to normalize the images during off-line image processing. We have investigated parameters influencing the stability of LEDs and developed procedures and criteria to prepare and select LEDs suitable for delivering stable light outputs for several 100 h of operation.

Weierganz, M; Bromberger, B; Dangendorf, V; Feldman, G; Goldberg, M B; Lindemann, M; Mor, I; Tittelmeier, K; Vartsky, D

2010-01-01T23:59:59.000Z

335

Development of an LED reference light source for calibration of radiographic imaging detectors  

E-Print Network (OSTI)

A stable reference light source based on an LED (Light Emission Diode) is presented for stabilizing the conversion gain of the opto-electronic system of a gamma- and fast-neutron radiographic and tomographic imaging device. A constant fraction of the LED light is transported to the image plane of the camera and provides a stable reference exposure. This is used to normalize the images during off-line image processing. We have investigated parameters influencing the stability of LEDs and developed procedures and criteria to prepare and select LEDs suitable for delivering stable light outputs for several 100 h of operation.

M. Weierganz; D. Bar; B. Bromberger; V. Dangendorf; G. Feldman; M. B. Goldberg; M. Lindemann; I. Mor; K. Tittelmeier; D. Vartsky

2010-02-08T23:59:59.000Z

336

THE FABRICATION AND ANALYSIS OF QUANTUM-DOT THIN FILM LIGHT EMITTING DIODES FOR USE IN DISPLAYS TECHNOLOGIES.  

E-Print Network (OSTI)

??The quantum dot has many applications, one of which is the light emitting diode. Quantum dot light emitting diodes were fabricated for their use in… (more)

Pickering, Shawn

2011-01-01T23:59:59.000Z

337

Demonstration Assessment of LED Roadway Lighting: Philadelphia, PA  

Science Conference Proceedings (OSTI)

For this demonstration assessment, 10 different groups of LED luminaires were installed at three sites in Philadelphia, PA. Each of the three sites represented a different set of conditions, most importantly with regard to the incumbent HPS luminaires, which were nominally 100 W, 150 W, and 250 W. The performance of each product was evaluated based on manufacturer data, illuminance calculations, field measurements of illuminance, and the subjective impressions of both regular and expert observers.

Royer, Michael P.; Tuenge, Jason R.; Poplawski, Michael E.

2012-09-01T23:59:59.000Z

338

Fabrication and Characterization of New Hybrid Organic Light Emitting Diode (OLED): Europium-picrate-triethylene oxide Complex  

SciTech Connect

Thin-film light emitting devices based on organic materials have attracted vast interest in applications such as light emitting diode (LED) and flat-panel display. The organic material can be attached with inorganic material to enhance the performance of the light emitting device. A hybrid OLED based on a new complex of europium picrate (Eu-pic) with triethylene oxide (EO3) ligand is fabricated. The OLED is fabricated by using spin coating technique with acetone as the solvent and aluminum as the top electrode. The optical, photoluminescence (PL) and electrical properties of the sample are carried out by UV-Vis spectroscopy (Jasco V-750), luminescence spectroscopy (Perkin Elmer LS-500) and source measure unit (SMU)(Keithly), respectively.

Sarjidan, M. A. Mohd; Abu Zakaria, N. Z. A.; Abd. Majid, W. H. [Solid State Research Laboratory, Department of Physics, University of Malaya, 50603, Kuala Lumpur (Malaysia); Kusrini, Eny; Saleh, M. I. [School of Chemical Sciences, Universiti Sains Malaysia, 11800 Penang (Malaysia)

2009-07-07T23:59:59.000Z

339

Solar LED Light Pilot Project Illuminates the Way in Alabama | Department  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Solar LED Light Pilot Project Illuminates the Way in Alabama Solar LED Light Pilot Project Illuminates the Way in Alabama Solar LED Light Pilot Project Illuminates the Way in Alabama September 12, 2012 - 2:15pm Addthis Boaz, Alabama Mayor Tim Walker, along with state representatives and community leaders, cut the ribbon for the state's solar LED light pilot project. | Photo courtesy of Lionel Green, Sand Mountain Reporter. Boaz, Alabama Mayor Tim Walker, along with state representatives and community leaders, cut the ribbon for the state's solar LED light pilot project. | Photo courtesy of Lionel Green, Sand Mountain Reporter. Tertia Speiser Project Officer, Golden Field Office "I want to invite everyone to come to Boaz and see the future of responsible highway lighting and power generation." -Boaz Mayor Tim Walker

340

Salazar, Chu to Flip Switch on Energy-Efficient LED Lights on National Mall  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

to Flip Switch on Energy-Efficient LED Lights on to Flip Switch on Energy-Efficient LED Lights on National Mall Salazar, Chu to Flip Switch on Energy-Efficient LED Lights on National Mall January 30, 2012 - 11:02am Addthis WASHINGTON, D.C.-Today, Secretary of the Interior Ken Salazar and Secretary of Energy Steven Chu will participate in a lighting ceremony featuring the newly-installed LED lights on the National Mall. Illuminating the Mall from 3rd to 15th Streets, the LED technology is expected to reduce lighting energy by up to 65 percent and provide a well-lit atmosphere to welcome the National Mall's 25 million annual visitors. "Achieving an economy built on American energy will require an all-of-the-above approach, one that includes safely and responsibly developing our domestic energy resources - and making the most of what we

Note: This page contains sample records for the topic "led light emitting" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

Solar LED Light Pilot Project Illuminates the Way in Alabama | Department  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

LED Light Pilot Project Illuminates the Way in Alabama LED Light Pilot Project Illuminates the Way in Alabama Solar LED Light Pilot Project Illuminates the Way in Alabama September 12, 2012 - 2:15pm Addthis Boaz, Alabama Mayor Tim Walker, along with state representatives and community leaders, cut the ribbon for the state's solar LED light pilot project. | Photo courtesy of Lionel Green, Sand Mountain Reporter. Boaz, Alabama Mayor Tim Walker, along with state representatives and community leaders, cut the ribbon for the state's solar LED light pilot project. | Photo courtesy of Lionel Green, Sand Mountain Reporter. Tertia Speiser Project Officer, Golden Field Office "I want to invite everyone to come to Boaz and see the future of responsible highway lighting and power generation." -Boaz Mayor Tim Walker

342

Life-Cycle Assessment of Energy and Environmental Impacts of LED Lighting Products Part 2: LED Manufacturing and Performance  

Science Conference Proceedings (OSTI)

Part 2 of the project (this report) uses the conclusions from Part 1 as a point of departure to focus on two objectives: producing a more detailed and conservative assessment of the manufacturing process and providing a comparative LCA with other lighting products based on the improved manufacturing analysis and taking into consideration a wider range of environmental impacts. In this study, we first analyzed the manufacturing process for a white-light LED (based on a sapphire-substrate, blue-light, gallium-nitride LED pumping a yellow phosphor), to understand the impacts of the manufacturing process. We then conducted a comparative LCA, looking at the impacts associated with the Philips Master LEDbulb and comparing those to a CFL and an incandescent lamp. The comparison took into account the Philips Master LEDbulb as it is now in 2012 and then projected forward what it might be in 2017, accounting for some of the anticipated improvements in LED manufacturing, performance and driver electronics.

Scholand, Michael; Dillon, Heather E.

2012-05-01T23:59:59.000Z

343

Amorphous silicon as electron transport layer for colloidal semiconductor nanocrystals light emitting diode  

Science Conference Proceedings (OSTI)

We demonstrate the fabrication of light-emitting diodes (LEDs) made from all-inorganic colloidal semiconducting nanocrystals (NCs). The diode utilizes a sandwich structure formed by placing CdSe/CdS NCs between two layers of Si and Ag{sub x}O, which act as electron- and hole-transporting materials, respectively. The photoluminescence properties of NCs are rendered less dependent upon surface chemistry and chemical environment by growing a thick CdS shell. It also enhances stability of the NCs during the process of magnetron sputtering for silicon deposition. The resulting LED device exhibits a low turn-on voltage of 2.5 V and the maximum external quantum efficiency of nearly 0.08%.

Song Tao; Shen Xiaojuan; Sun Baoquan [Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Functional Nano and Soft Materials Laboratory (FUNSOM), Soochow University, 199 Ren'ai Road, Suzhou 215123 (China); Zhang Fute [Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Functional Nano and Soft Materials Laboratory (FUNSOM), Soochow University, 199 Ren'ai Road, Suzhou 215123 (China); Key Laboratory of Organic Synthesis of Jiangsu Province, School of Chemistry and Chemical Engineering, Soochow University, Suzhou 215123 (China); Zhang Xiaohong [Nano-Organic Photoelectronic Laboratory and Laboratory of Organic Optoelectronic Functional Materials and Molecular Engineering, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190 (China); Zhu Xiulin [Key Laboratory of Organic Synthesis of Jiangsu Province, School of Chemistry and Chemical Engineering, Soochow University, Suzhou 215123 (China)

2009-12-07T23:59:59.000Z

344

Package of Homojunction of Fully Conjugated Heterocyclic Aromatic Rigid-rod Polymer Light Emitting Diodes.  

E-Print Network (OSTI)

??The focus of this study is mono-layer polymer light emitting diode (PLED). The emitting layer is poly-p-phenylenebenzobisoxazole (PBO). PBO is a fully conjugated heterocyclic aromatic… (more)

Liao, Hung-chi

2004-01-01T23:59:59.000Z

345

Chip-Scale Power Conversion for LED Lighting: Integrated Power Chip Converter for Solid-State Lighting  

Science Conference Proceedings (OSTI)

ADEPT Project: Teledyne is developing cost-effective power drivers for energy-efficient LED lights that fit on a compact chip. These power drivers are important because they transmit power throughout the LED device. Traditional LED driver components waste energy and don't last as long as the LED itself. They are also large and bulky, so they must be assembled onto a circuit board separately which increases the overall manufacturing cost of the LED light. Teledyne is shrinking the size and improving the efficiency of its LED driver components by using thin layers of an iron magnetic alloy and new gallium nitride on silicon devices. Smaller, more efficient components will enable the drivers to be integrated on a single chip, reducing costs. The new semiconductors in Teledyne's drivers can also handle higher levels of power and last longer without sacrificing efficiency. Initial applications for Teledyne's LED power drivers include refrigerated grocery display cases and retail lighting.

None

2010-10-01T23:59:59.000Z

346

TESLA-FEL 2007-03 Application of low cost GaAs LED as neutron  

E-Print Network (OSTI)

neutrons in unbiased Gallium Arsenide (GaAs) Light Emitting Diodes (LED) resulted in a reduction Keywords: COTS components, Displacement damage, Electron Linear Accelerator, GaAs Light emitting diode (LED) Gallium Arsenide (GaAs) light emitting diode (LED) for the assessment of integrated neutron fluence

347

Improving light output power of InGaN-based light emitting diodes with pattern-nanoporous p-type GaN:Mg surfaces  

SciTech Connect

InGaN-based light emitting diodes (LEDs) with a top pattern-nanoporous p-type GaN:Mg surface were fabricated by using a photoelectrochemical (PEC) process. The peak wavelengths of electroluminescence (EL) and operating voltages were measured as 461.2 nm (3.1 V), 459.6 nm (9.2 V), and 460.1 nm (3.3 V) for conventional, nanoporous, and pattern-nanoporous LEDs using 20 mA operation current. The EL spectrum of the nanoporous LED had a larger blueshift phenomenon as a result of a partial compression strain release in the InGaN active layer through the formation of a top nanoporous surface. The light output power had 12.1% and 26.4% enhancements for the nanoporous and the pattern-nanoporous LEDs compared with conventional LEDs. The larger operating voltage of the nanoporous LED was due to the non-ohmic contact on the PEC treated p-type GaN:Mg surface. By using a pattern-nanoporous p-type GaN:Mg structure, the operating voltage of the pattern-nanoporous LED was reduced to 3.3 V. A lower compression strain in the InGaN active layer and a higher light extraction efficiency at the top nanoporous surface were observed in pattern-nanoporous LEDs for higher efficiency nitride-based LED applications.

Yang, C.C.; Lin, C.F.; Lin, C.M.; Chang, C.C.; Chen, K.T.; Chien, J.F.; Chang, C.Y. [Department of Materials Engineering, National Chung Hsing University, Taichung 402, Taiwan (China)

2008-11-17T23:59:59.000Z

348

Fundamental Studies and Development of III-N Visible LEDs for High-Power Solid-State Lighting Applications  

SciTech Connect

The goal of this program is to understand in a fundamental way the impact of strain, defects, polarization, and Stokes loss in relation to unique device structures upon the internal quantum efficiency (IQE) and efficiency droop (ED) of III-nitride (III-N) light-emitting diodes (LEDs) and to employ this understanding in the design and growth of high-efficiency LEDs capable of highly-reliable, high-current, high-power operation. This knowledge will be the basis for our advanced device epitaxial designs that lead to improved device performance. The primary approach we will employ is to exploit new scientific and engineering knowledge generated through the application of a set of unique advanced growth and characterization tools to develop new concepts in strain-, polarization-, and carrier dynamics-engineered and low-defect materials and device designs having reduced dislocations and improved carrier collection followed by efficient photon generation. We studied the effects of crystalline defect, polarizations, hole transport, electron-spillover, electron blocking layer, underlying layer below the multiplequantum- well active region, and developed high-efficiency and efficiency-droop-mitigated blue LEDs with a new LED epitaxial structures. We believe new LEDs developed in this program will make a breakthrough in the development of high-efficiency high-power visible III-N LEDs from violet to green spectral region.

Dupuis, Russell

2012-02-29T23:59:59.000Z

349

DUAL USE OF LEDS: SIGNALING AND COMMUNICATIONS IN ITS Grantham Pang, Chi-ho Chan, Hugh Liu, Thomas Kwan  

E-Print Network (OSTI)

of light-emitting diodes (LEDs) over incandescent lights is well-supported. This is due to their high construction of LEDs panel and the illuminance of LEDs. CONCLUSIONS In the near future, light-emitting diodes, U.S. Patent Office. 2. "Light emitting diode dot matrix display system with audio output", G. Pang

Pang, Grantham

350

Lighting Overview Page 6-1 2008 Residential Compliance Manual August 2009  

E-Print Network (OSTI)

intensity discharge lamps (like metal halide lamps) light emitting diode (LED) luminaires (dedicated LED Manual August 2009 §119(m); Table 150(c) LED Certification Requirements. Light emitting diode (LED Lighting Source Systems. For a light emitting diode (LED) lighting source system to qualify as high

351

Solid-State Lighting: Text-Alternative Version: The L Prize-Winning LED A19  

NLE Websites -- All DOE Office Websites (Extended Search)

The L The L Prize-Winning LED A19 Replacement-What Commercial Building Owners/Operators Can Expect in 2012 to someone by E-mail Share Solid-State Lighting: Text-Alternative Version: The L Prize-Winning LED A19 Replacement-What Commercial Building Owners/Operators Can Expect in 2012 on Facebook Tweet about Solid-State Lighting: Text-Alternative Version: The L Prize-Winning LED A19 Replacement-What Commercial Building Owners/Operators Can Expect in 2012 on Twitter Bookmark Solid-State Lighting: Text-Alternative Version: The L Prize-Winning LED A19 Replacement-What Commercial Building Owners/Operators Can Expect in 2012 on Google Bookmark Solid-State Lighting: Text-Alternative Version: The L Prize-Winning LED A19 Replacement-What Commercial Building Owners/Operators Can Expect in 2012 on Delicious

352

An Efficient LED System-in-Module for General Lighting Applications  

SciTech Connect

The objective of the project was to realize an LED-based lighting technology platform for general illumination, starting with LED chips, and integrating the necessary technologies to make compact, user-friendly, high-efficiency, energy-saving sources of controlled white (or variable-colored) light. The project is to build the system around the LEDs, and not to work on the LEDs themselves, in order that working products can be introduced soon after the LEDs reach suitable efficiency for mass-production of high-power light sources for general illumination. Because the light sources are intended for general illumination, color must be accurately maintained, requiring feedback control in the electronics. The project objective has been realized and screw base demonstrators, based on the technology developed in the project, have been built.

2008-09-14T23:59:59.000Z

353

Method to generate high efficient devices which emit high quality light for illumination  

DOE Patents (OSTI)

An electroluminescent apparatus includes an OLED device emitting light in the blue and green spectrums, and at least one down conversion layer. The down conversion layer absorbs at least part of the green spectrum light and emits light in at least one of the orange spectra and red spectra.

Krummacher, Benjamin C. (Sunnyvale, CA); Mathai, Mathew (Santa Clara, CA); Choong, Vi-En (San Jose, CA); Choulis, Stelios A. (San Jose, CA)

2009-06-30T23:59:59.000Z

354

Wide-Area Thermal Processing of Light-Emitting Materials  

Science Conference Proceedings (OSTI)

Silicon carbide based materials and devices have been successfully exploited for diverse electronic applications. However, they have not achieved the same success as Si technologies due to higher material cost and higher processing temperatures required for device development. Traditionally, SiC is not considered for optoelectronic applications because it has an indirect bandgap. However, AppliCote Associates, LLC has developed a laser-based doping process which enables light emission in SiC through the creation of embedded p-n junctions. AppliCote laser irradiation of silicon carbide allows two different interaction mechanisms: (1) Laser conversion or induced phase transformation which creates carbon rich regions that have conductive properties. These conductive regions are required for interconnection to the light emitting semiconducting region. (2) Laser doping which injects external dopant atoms into the substrate that introduces deep level transition states that emit light when electrically excited. The current collaboration with AppliCote has focused on the evaluation of ORNL's unique Pulse Thermal Processing (PTP) technique as a replacement for laser processing. Compared to laser processing, Pulse Thermal Processing can deliver similar energy intensities (20-50 kW/cm2) over a much larger area (up to 1,000 cm2) at a lower cost and much higher throughput. The main findings of our investigation; which are significant for the realization of SiC based optoelectronic devices, are as follows: (1) The PTP technique is effective in low thermal budget activation of dopants in SiC similar to the laser technique. The surface electrical conductivity of the SiC samples improved by about three orders of magnitude as a result of PTP processing which is significant for charge injection in the devices; (2) The surface composition of the SiC film can be modified by the PTP technique to create a carbon-rich surface (increased local C:Si ratio from 1:1 to 2.9:1). This is significant as higher thermal and electrical conductivities of the surface layer are critical for a successful development of integrated optoelectronic devices; and (3) PTP provides low thermal budget dopant activation with a controlled depth profile, which can be exploited for high performance device development with selective patterning of the substrate. This project has successfully demonstrated that a low thermal budget annealing technique, such as PTP, is critical to defining the path for low cost electronic devices integrated on glass or polymeric substrates. This project is complimentary to the goals of the Solid State Lighting Program within DOE. It involves new manufacturing techniques for light emitting materials that are potentially much lower cost and energy efficient than existing products. Significant opportunity exists for further exploration of AppliCote's material and device technology in combination with ORNL's PTP technique, modeling, and characterization capabilities.

Duty, C.; Quick, N. (AppliCote Associates, LLC)

2011-09-30T23:59:59.000Z

355

Low Voltage, Low Power Organic Light Emitting Transistors for AMOLED Displays  

SciTech Connect

Low voltage, low power dissipation, high aperture ratio organic light emitting transistors are demonstrated. The high level of performance is enabled by a carbon nanotube source electrode that permits integration of the drive transistor and the organic light emitting diode into an efficient single stacked device. Given the demonstrated performance, this technology could break the technical logjam holding back widespread deployment of active matrix organic light emitting displays at flat panel screen sizes.

McCarthy, M. A. [University of Florida, Gainesville; Liu, B. [University of Florida, Gainesville; Donoghue, E. P. [University of Florida, Gainesville; Kravchenko, Ivan I [ORNL; Kim, D. Y. [University of Florida, Gainesville; Reynolds, J. R. [University of Florida, Gainesville; So, Franky [University of Florida, Gainesville; Rinzler, A. G. [University of Florida, Gainesville

2011-01-01T23:59:59.000Z

356

Investigation of an Electromagnetic Interference (EMI) Problem Involving Light-Emitting Diode Streetlights and an Amateur Radio Tran sceiver  

Science Conference Proceedings (OSTI)

Any type of electronic device is susceptible to energy from the electromagnetic environment. This technical update describes an investigation of electromagnetic interference (EMI) problems associated with amateur radio, distribution hardware, and streetlights at a customer's home in Camden, Tennessee. Because light-emitting diode (LED) streetlights were deemed the direct cause of the EMI problem, an investigational plan involving a two-level effort was customized to fit the situation. First, field observ...

2011-10-06T23:59:59.000Z

357

Light-extraction enhancement in GaN-based light-emitting diodes using grade-refractive-index amorphous titanium oxide films with porous structures  

SciTech Connect

Amorphous titanium oxide (a-TiO{sub x}:OH) films prepared by plasma-enhanced chemical-vapor deposition at 200 and 25 deg. C are in turn deposited onto the GaN-based light-emitting diode (LED) to enhance the associated light extraction efficiency. The refractive index, porosity, and photocatalytic effect of the deposited films are correlated strongly with the deposition temperatures. The efficiency is enhanced by a factor of {approx}1.31 over that of the uncoated LEDs and exhibited an excellent photocatalytic property after an external UV light irradiation. The increase in the light extraction is related to the reduction in the Fresnel transmission loss and the enhancement of the light scattering into the escape cone by using the graded-refractive-index a-TiO{sub x}:OH film with porous structures.

Liu, D.-S.; Lin, T.-W.; Huang, B.-W.; Juang, F.-S.; Lei, P.-H. [Institute of Electro-Optical and Materials Science, National Formosa University, Huwei 63201, Taiwan (China); Hu, C.-Z. [Chilin Technology Co. Ltd., Tainan County 71758, Taiwan (China)

2009-04-06T23:59:59.000Z

358

GREEN LIVING Replace incandencent and halogen light bulbs with LED and CLFs  

E-Print Network (OSTI)

GREEN LIVING GUIDE ENERGY TRAVEL FOOD sustain yosef WATER Replace incandencent and halogen light bulbs with LED and CLFs TURN YOUR COMPUTER OFF! Any time you will be gone for an hour or more for your laundry RESIST THAT SWITCH! Use natural light during the day, and no lights when you are gone USE

Thaxton, Christopher S.

359

Effective hole-injection layer for non-doped inverted top-emitting organic light-emitting devices  

Science Conference Proceedings (OSTI)

Non-doped inverted top-emitting organic light-emitting diode with high efficiency is demonstrated through employing an effective hole-injection layer composed of MoO"x. One reason for high efficiency lies on the energy-level matching between MoO"x and ... Keywords: 78.60.Fi, 82.45.Mp, 85.60.Jb, Hole-injection, ITEOLEDs, MoOx

Yanlong Meng; Wenfa Xie; Ning Zhang; Shufen Chen; Jiang Li; Wei Hu; Yi Zhao; Jingying Hou; Shiyong Liu

2008-05-01T23:59:59.000Z

360

Surface Mounted Under Counter Dimmable LED Strip-STR8  

Science Conference Proceedings (OSTI)

The product under assessment is an advanced lighting technologya controllable, surface mounted under-counter light emitting diode (LED) strip lighting system that is designed to provide various levels of direct and indirect white light.

2008-06-12T23:59:59.000Z

Note: This page contains sample records for the topic "led light emitting" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Designing Interactive Lighting Dzmitry Aliakseyeu, Bernt Meerbeek, Jon  

E-Print Network (OSTI)

The Light Emitting Diode (LED) has caused a profound change within the lighting industry. This is due

362

An LED-only BRDF Measurement Device Moshe Ben-Ezra, Jiaping Wang and Bennett Wilburn  

E-Print Network (OSTI)

.edu l-ma03@mails.tsinghua.edu.cn Abstract Light Emitting Diodes (LEDs) can be used as light detec- tors to a light emitting diode (LED) was by Henry J. Round in 1907[15]. He touched a metal wire to a silicon] F. Mims III. Sun photometer with light-emitting diodes as spectrally selective detectors. Applied

Ben-Ezra, Moshe

363

The effect of anisotropy on light extraction of organic light-emitting diodes with photonic crystal structure  

Science Conference Proceedings (OSTI)

The light extraction efficiency of organic light-emitting diodes (OLED) is greatly limited due to the difference in refractive indexes betweenmaterials ofOLED.We fabricatedOLED with photonic crystal microstructures in the interface between the glass ...

Wei Xu, Yang Li

2013-01-01T23:59:59.000Z

364

Understanding Drooping Light Emitting Diodes CEEM | U.S. DOE...  

Office of Science (SC) Website

Impact Understanding "droop" may result in cheaper, more efficient LEDs; LEDs are more energy efficient, smaller, and longer-lived than incandescent lamps or fluorescent...

365

Solid-State Lighting: Webinar: The L Prize-Winning LED A19Replacement...  

NLE Websites -- All DOE Office Websites (Extended Search)

Webinar: The L Prize-Winning LED A19 Replacement-What Commercial Building OwnersOperators Can Expect in 2012 to someone by E-mail Share Solid-State Lighting: Webinar: The L...

366

Replacement of Lighting Fixtures with LED Energy Efficient Lights at the Parking Facility, Milwaukee, Wisconsin  

Science Conference Proceedings (OSTI)

The Forest County Potawatomi Community (FCPC or Tribe) owns a six-story parking facility adjacent to its Potawatomi Bingo Casino (the Casino) in Milwaukee, Wisconsin, as well as a valet parking facility under the Casino (collectively, the Parking Facility). The Parking Facility contained 205-watt metal halide-type lights that, for security reasons, operated 24 hours per day, 7 days per week. Starting on August 30, 2010, the Tribe replaced these fixtures with 1,760 state-of-the-art, energy efficient 55-Watt LED lights. This project resulted in an immediate average reduction in monthly peak demand of 238 kW over the fourth quarter of 2010. The average reduction in monthly peak demand from October 1 through December 31, 2010 translates into a forecast annual electrical energy reduction of approximately 1,995,000 kWh or 47.3% of the pre-project demand. This project was technically effective, economically feasible, and beneficial to the public not only in terms of long term energy efficiency and associated emissions reductions, but also in the short-term jobs provided for the S.E. Wisconsin region. The project was implemented, from approval by U.S. Department of Energy (DOE) to completion, in less than 6 months. The project utilized off-the-shelf proven technologies that were fabricated locally and installed by local trade contractors.

David Brien

2012-06-21T23:59:59.000Z

367

Ensure Long Lifetimes from Electrolytic Capacitors: a Case Study in LED Light Bulbs  

E-Print Network (OSTI)

Abstract: Electrolytic capacitors are notorious for short lifetimes in high-temperature applications such as LED light bulbs. The careful selection of these devices with proper interpretation of their specifications is essential to ensure that they do not compromise the life of the end product. This application note discusses this problem with electrolytic capacitors in LED light bulbs and provides an analysis that shows how it is possible to use electrolytics in such products. A similar version of this article appeared on EDN, April 6, 2013. Hot LEDs and Short-Lived Electrolytic Capacitors Several years ago, I worked on a few designs for LED light bulbs. Very early on, it became clear that the temperatures of components in such light bulbs can get quite high. I personally measured component temperatures as high as +130°C in light bulbs purchased at local retail stores. Now admittedly, these were early LED bulb designs. Manufacturers now understand that, even though these LED bulbs consume substantially lower power than those they would replace, they still must have good thermal engineering. This is the only way to get the lifetime of the electronics to match the lifetime of the LEDs themselves. I found it disturbing that many of these hot designs contained electrolytic capacitors, which are notorious

Mark Fortunato; Senior Principal; Member Technical Staff

2013-01-01T23:59:59.000Z

368

Development of InAsSb-based light emitting diodes for chemical sensing systems  

SciTech Connect

Mid-infrared (3--6 {micro}m) LED`s are being developed for use in chemical sensor systems. As rich, InAsSb heterostructures are particularly suited for optical emitters in the mid-infrared region. The authors are investigating both InAsSb-InAs multiple quantum well (MQW) and InAsSb-InAsP strained layer superlattice (SLS) structures for use as the active region for light emitting diodes (LED`s). The addition of phosphorus to the InAs barriers increases the light and heavy hole splitting and hence reduces non-radiative Auger recombination and provides for better electron and hole confinement in the InAsSb quantum well. Low temperature (< 20 K) photoluminescence (PL) emission from MQW structures is observed between 3.2 to 6.0 {micro}m for InAsSb wells between 70 to 100 {angstrom} and antimony mole fractions between 0.04 to 0.18. Room temperature PL has been observed to 6.4 {micro}m in MQW structures. The additional confinement by InAsP barriers results in low temperature PL being observed over a narrower range (3.2 to 5.0 {micro}m) for the similar well thicknesses with antimony mole fractions between 0.10 to 0.24. Room temperature photoluminescence was observed to 5.8 {micro}m in SLS structures. The addition of a p-AlAsSb layer between the n-type active region (MQW or SLS) and a p-GaAsSb contact layer improves electron confinement of the active region and increases output power by a factor of 4. Simple LED emitters have been fabricated which exhibit an average power at room temperature of > 100 {micro}W at 4.0 {micro}m for SLS active regions. These LED`s have been used to detect CO{sub 2} concentrations down to 24 ppm in a first generation, non-cryogenic sensor system. They will report on the development of novel LED device designs that are expected to lead to further improvements in output power.

Allerman, A.A.; Kurtz, S.R.; Biefeld, R.M.; Baucom, K.C.; Burkhatt, J.H.

1998-02-01T23:59:59.000Z

369

Stability studies of nanosecond light sources based on blue ultra bright LEDs  

E-Print Network (OSTI)

We present the results of stability studies of nanosecond light sources based on single quantum well (SQW) InGaN/GaN ultra bright blue LEDs. It is shown that the light yield of such light sources and their timing characteristics don't deteriorate even after 10^10 total pulses. The longterm stability of the sources light yield is better than 1%.

B. K. Lubsandorzhiev; Y. E. Vyatchin

2004-03-01T23:59:59.000Z

370

Stability studies of nanosecond light sources based on blue ultra bright LEDs  

E-Print Network (OSTI)

We present the results of stability studies of nanosecond light sources based on single quantum well (SQW) InGaN/GaN ultra bright blue LEDs. It is shown that the light yield of such light sources and their timing characteristics don't deteriorate even after 10^10 total pulses. The longterm stability of the sources light yield is better than 1%.

Lubsandorzhiev, B K

2004-01-01T23:59:59.000Z

371

Lighting: Past, Present and Future 2010 IEEE Lester Eastman Conference  

E-Print Network (OSTI)

. Unlike incandescent bulbs, LEDs do not emit light in a full 360° radiation pattern. Instead, they emit that is quintessential to the research and development of LEDs. As LEDs move to dominance in the lighting market

Salama, Khaled

372

Seeing the Light: LED Under-Cabinet and Recessed Downlights | Department of  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Seeing the Light: LED Under-Cabinet and Recessed Downlights Seeing the Light: LED Under-Cabinet and Recessed Downlights Seeing the Light: LED Under-Cabinet and Recessed Downlights August 2, 2010 - 10:42am Addthis Chris Stewart Senior Communicator at DOE's National Renewable Energy Laboratory I moved into my apartment about four years ago. Little by little, I've continued to make improvements that help me save money on my energy bills. I've: Applied weatherstripping to seal air leaks around windows Insulated my crawl space Installed storm windows to reduce air movement into and out of existing windows (I live in a historic district and can't replace my windows) Installed window shades to help with insulation Replaced my incandescent lighting fixtures with compact fluorescent lamps (CFLs) (I even purchased outdoor solar lights for my dad for Fathers Day.)

373

Optical Simulation of Top-emitting Organic Light Emitting Diodes H. J. Peng, C.F. Qiu, Z. L. Xie, H. Y. Chen, M. Wong and H. S. Kwok  

E-Print Network (OSTI)

8.3.3-89 Optical Simulation of Top-emitting Organic Light Emitting Diodes H. J. Peng, C.F. Qiu, Z the optical effects for the top-emitting organic light emitting diodes. The optical performance of the devices with experiments Keywords: Top-emitting organic light emitting diode, optical modeling, microcavity INTRODUCTION

Kwok, Hoi S.

374

Nanocluster-based white-light-emitting material employing surface tuning  

DOE Patents (OSTI)

A method for making a nanocrystal-based material capable of emitting light over a sufficiently broad spectral range to appear white. Surface-modifying ligands are used to shift and broaden the emission of semiconductor nanocrystals to produce nanoparticle-based materials that emit white light.

Wilcoxon, Jess P. (Albuquerque, NM); Abrams, Billie L. (Albuquerque, NM); Thoma, Steven G. (Albuquerque, NM)

2007-06-26T23:59:59.000Z

375

Development of Efficient UV-LED Phosphor Coatings for Energy Saving Solid State Lighting  

SciTech Connect

The University of Georgia, in collaboration with GE Global Research, has investigated the relevant quenching mechanism of phosphor coatings used in white light devices based on UV LEDs. The final goal of the project was the design and fabrication of a high-efficacy white light UV-LED device through improved geometry and optimized phosphor coatings. At the end of the research period, which was extended to seamlessly carry over the research to a follow-up program, we have demonstrated a two-fold improvement in the conversion efficiency of a white light LED device, where the increase efficacy is due to both improved phosphor quantum efficiency and lamp geometry. Working prototypes have been displayed at DOE sponsored meetings and during the final presentation at the DOE Headquarters in Washington, DC. During the first phase of the project, a fundamental understanding of quenching processes in UV-LEDs was obtained, and the relationships that describe the performance of the phosphor as a function of photon flux, temperature, and phosphor composition were established. In the second phase of the project, these findings were then implemented to design the improved UV-LED lamp. In addition, our research provides a road map for the design of efficient white light LEDs, which will be an important asset during a follow-up project led by GE.

Uwe Happek

2006-05-15T23:59:59.000Z

376

LED- ja loisteputkivalon vaikutus maitotaloustuotteiden ja perunan laatuun.  

E-Print Network (OSTI)

??Tutkielman kirjallisuuskatsauksessa tarkasteltiin valoa, erilaisia valonlähteitä ja niiden ominaisuuksia. Erityisesti keskityttiin LED (Light Emitting Diode) valoon ja sen ominaisuuksiin, koska sen käyttö myös yleisessä valaistuksessa… (more)

Solala, Kari

2009-01-01T23:59:59.000Z

377

Driver Circuit for White LED Lamps with TRIAC Dimming Control.  

E-Print Network (OSTI)

??An efficient Light Emitting Diode (LED) lamp driver circuit is proposed for retrofitting the conventionally used incandescent lamps with existing TRIAC dimmer. The dimming feature… (more)

Weng, Szu-Jung

2012-01-01T23:59:59.000Z

378

A Demonstration of LED Lighting for Saving Energy in the Poultry Sector  

DOE Green Energy (OSTI)

The Lumina Project and Lighting Africa conducted a full-scale field test involving a switch from kerosene to solar-LED lighting for commercial broiler chicken production at an off-grid farm in Kenya. The test achieved lower operating costs, produced substantially more light, improved the working environment, and had no adverse effect on yields. A strategy using conventional solar-fluorescent lighting also achieved comparable yields, but entailed a six-fold higher capital cost and significantly higher recurring battery replacement costs. Thanks to higher energy and optical efficiencies, the LED system provided approximately twice the illumination to the chicken-production area and yet drew less than half the power.At the study farm, 3000 chickens were grown in each of three identical houses under kerosene, fluorescent, and LED lighting configurations. Under baseline conditions, a yearly expenditure of 1,200 USD is required to illuminate the three houses with kerosene. The LED system eliminates this fuel use and expense with a corresponding simple payback time of 1.5 years, while the solar-fluorescent system has a payback time of 9.3 years. The corresponding reduction in fuel expenditure in both cases represents a 15percent increase in after-tax net income (revenues minus expenses) across the entire business operation. The differential cost-effectiveness between the LED and fluorescent systems would be substantially greater if the fluorescent system were upsized to provide the same light as the LED system. Providing light with the fluorescent or LED systems is also far more economical than connecting to the grid in this case. The estimated grid-connection cost at this facility is 1.7 million Kenya Schillings (approximately 21,250 USD), which is nearly six-times the cost of the fluorescent system and 35-times the cost of the LED system.The LED system also confers various non-energy benefits. The relative uniformity of LED lighting, compared to the fluorescent or kerosene lighting, reduced crowding which in turn created a less stressful environment for the chickens. The far higher levels of illumination also created a better environment for the workers, while eliminating the time required for obtaining fuel and maintaining kerosene lanterns. An additional advantage of the LED system relative to the solar fluorescent system was that the former does not require a skilled technician to carry out the installation. The portable LED system lighting layout is also more easily adjusted than that of the hardwired fluorescent systems. Furthermore, switching to the LED system avoids over one metric ton of carbon dioxide emissions per house on an annual basis compared to kerosene. There is high potential for replication of this particular LED lighting strategy in the developing world. In order to estimate the scale of kerosene use and the potential for savings, more information is needed on the numbers of chickens produced off-grid, as well as lighting uses for other categories of poultry production (egg layers, indigenous broilers ). Our discovery that weight gain did not slow in the solar-fluorescent house after it experienced extended lighting outages beginning on day 14 of the 35-day study suggests that conventional farming practices in Kenyan broiler operations may call for more hours of lighting than is needed to achieve least-cost production.

Tracy, Jennifer; Mills, Evan

2010-11-06T23:59:59.000Z

379

New radiochromic film densitometry system using commercially available digital camera and LEDs.  

E-Print Network (OSTI)

??This project involved designing and building a radiochromic film (RCF) densitometer using a still digital camera as the light detector and light emitting diode, LED,… (more)

Tran, T

2008-01-01T23:59:59.000Z

380

Lighting Enhancement of GaN LEDs by Applying p-Type Ni(P):SnO2 ...  

Science Conference Proceedings (OSTI)

About this Abstract. Meeting, Materials Science & Technology 2013. Symposium, Multifunctional Oxides. Presentation Title, Lighting Enhancement of GaN LEDs ...

Note: This page contains sample records for the topic "led light emitting" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Layering Mismatched Lattices Creates Long-Sought-After Green Light-Emitting Diode (Fact Sheet), NREL Highlights, Science, NREL (National Renewable Energy Laboratory)  

NLE Websites -- All DOE Office Websites (Extended Search)

Scientists at the National Renewable Energy Laboratory (NREL) Scientists at the National Renewable Energy Laboratory (NREL) invent a deep green LED that can lead to higher-efficiency white light, lower electric bills. The white light light-emitting diode (LED) that promises to revolutionize indoor lighting while dramatically lowering electricity costs had been confounded by the so-called "green gap:" the inability to develop light in the green spectrum that can be combined with red and blue to produce white light. NREL researchers conceptualized a green emission by taking a different look at how the laboratory's solar cell researchers had set a world efficiency record and by changing a key process that had created a red LED. A good green color of light is between 530 and 570 nanometers (nm) on the Color

382

Metal-assisted electroless fabrication of nanoporous p-GaN for increasing the light extraction efficiency of light emitting diodes  

SciTech Connect

We report metal-assisted electroless fabrication of nanoporous p-GaN to improve the light extraction efficiency of GaN-based light emitting diodes (LEDs). Although it has long been believed that p-GaN cannot be etched at room temperature, in this study we find that Ag nanocrystals (NCs) on the p-GaN surface enable effective etching of p-GaN in a mixture of HF and K{sub 2}S{sub 2}O{sub 8} under ultraviolet (UV) irradiation. It is further shown that the roughened GaN/air interface enables strong scattering of photons emitted from the multiple quantum wells (MQWs). The light output power measurements indicate that the nanoporous LEDs obtained after 10 min etching show a 32.7% enhancement in light-output relative to the conventional LEDs at an injection current of 20 mA without significant increase of the operating voltage. In contrast, the samples etched for 20 min show performance degradation when compared with those etched for 10 min, this is attributed to the current crowding effect and increased surface recombination rate.

Wang Ruijun; Liu Duo; Zuo Zhiyuan; Yu Qian; Feng Zhaobin; Xu Xiangang [State Key Laboratory of Crystal Materials, Shandong University, 27 South Shanda Road, Jinan, Shandong 250100 (China)

2012-03-15T23:59:59.000Z

383

Wavelength-resolved low-frequency noise of GaInN/GaN green light emitting diodes  

E-Print Network (OSTI)

Wavelength-resolved low-frequency noise of GaInN/GaN green light emitting diodes S. L. Rumyantseva well light emitting diodes. The light intensity noise was measured as a function of wavelength within the light emitting diode spectral emission line. The spectral noise density is found to increase

Wetzel, Christian M.

384

Fabrication of InGaP LEDs on a graded buffer substrate  

E-Print Network (OSTI)

Introduction: Computer display panels create a vast color palette by combining color from three light emitting diodes (LEDs), each producing red, green, or blue light. The light from these three LEDs is chosen so that the ...

Martínez, Josué F

2007-01-01T23:59:59.000Z

385

LED Light Fixture Project FC1 Director's Conference Room: Life Cycle Cost and Break-even Analysis  

E-Print Network (OSTI)

LED Light Fixture Project ­ FC1 Director's Conference Room: Life Cycle Cost and Break-even Analysis. #12;LED Light Fixture Project ­ FC1 Director's Conference Room: Life Cycle Cost and Break,812 Maintenance Cost $620 $0 $97 $0 Life Cycle Cost $1,787 $1,693 $2,980 $2,980 #12;LED Light Fixture Project ­ FC

Hofmann, Hans A.

386

Lumen Maintenance and Light Loss Factors: Consequences of Current Design Practices for LED's  

SciTech Connect

Synopsis: Light loss factors are used to help lighting systems meet quantitative design criteria throughout the life of the installation, but they also influence energy use. As the light sources currently being specified continue to evolve, it is necessary to reevaluate the methods used in calculating light loss factors, as well as carefully consider the consequences of different product performance attributes. Because of the unique operating characteristics of LEDs and lack of a comprehensive lifetime rating—as well as the problematic relationship between lifetime and lumen maintenance—determining an appropriate lamp lumen depreciation (LLD) factor for LED products is difficult. As a result, a unique solution has been advocated: when quantity of light is an important design consideration, the IES recommends using an LLD of not greater than 0.70. This method deviates from the typical practice for conventional sources of using the ratio of mean to initial lumen output, and can misrepresent actual performance, increase energy use, and inhibit comparisons between products. This paper discusses the complications related to LLD and LEDs, compares the performance of conventional and LED products, and examines alternatives to a maximum LLD of 0.70 for LEDs.

Royer, Michael P.

2013-09-17T23:59:59.000Z

387

The Hybridization of CdSe/ZnS Quantum Dot on InGaN Light-Emitting Diodes for Color Conversion  

Science Conference Proceedings (OSTI)

We have demonstrated the fabrication and characterization of hybrid CdSe/ZnS quantum dot (QD)-InGaN blue LEDs. The chemically synthesized red light (lambda = 623 nm) QD solutions with different concentrations were dropped onto the blue InGaN LEDs with ... Keywords: CdSe/ZnS quantum dots, CdSe/ZnS quantum dots (QDs), InGaN quantum well and hybrid LEDs, InGaN quantum well and hybrid light-emitting diodes

Ying-Chih Chen; Chun-Yuan Huang; Yan-Kuin Su; Wen-Liang Li; Chia-Hsien Yeh; Yu-Cheng Lin

2008-07-01T23:59:59.000Z

388

How might the use of LEDs be expanded in  

E-Print Network (OSTI)

, the replacement of incandescent bulbs with inorganic-based LEDs could potentially revolutionize indoor lightingScientists at the National Renewable Energy Laboratory (NREL) invent a deep green LED that can lead to higher-efficiency white light, lower electric bills. The white light light-emitting diode (LED

Sherrill, David

389

Lighting Choices to Save You Money | Department of Energy  

NLE Websites -- All DOE Office Websites (Extended Search)

EPA's website for more information. LEDs -- about 75%-80% energy savings The light emitting diode (LED) are a type of solid-state lighting -- semiconductors that convert...

390

Development of UV-LED Phosphor Coatings for High Efficiency Solid State Lighting  

SciTech Connect

The University of Georgia, in collaboration with GE Global Research, is investigating the relevant quenching mechanism of phosphor coatings used in white light devices based on UV LEDs in a focused eighteen month program. The final goal is the design of high-efficacy white UV-LEDs through improved and optimized phosphor coatings. At the end of the first year, we have reached a fundamental understanding of quenching processes in UV-LED phosphors and have observed severe quenching in standard devices under extreme operating conditions. Relationships are being established that describe the performance of the phosphor as a function of photon flux, temperature, and phosphor composition. These relationships will provide a road map for the design of efficient white light LEDs during the final six months of the project.

U. Happek

2005-01-01T23:59:59.000Z

391

Organic Light-Emitting Devices (OLEDS) and Their Optically Detected Magnetic Resonance (ODMR)  

DOE Green Energy (OSTI)

Organic Light-Emitting Devices (OLEDs), both small molecular and polymeric have been studied extensively since the first efficient small molecule OLED was reported by Tang and VanSlyke in 1987. Burroughes' report on conjugated polymer-based OLEDs led to another track in OLED development. These developments have resulted in full color, highly efficient (up to {approx} 20% external efficiency 60 lm/W power efficiency for green emitters), and highly bright (> 140,000 Cd/m{sup 2} DC, {approx}2,000,000 Cd/m{sup 2} AC), stable (>40,000 hr at 5 mA/cm{sup 2}) devices. OLEDs are Lambertian emitters, which intrinsically eliminates the view angle problem of liquid crystal displays (LCDs). Thus OLEDs are beginning to compete with the current dominant LCDs in information display. Numerous companies are now active in this field, including large companies such as Pioneer, Toyota, Estman Kodak, Philipps, DuPont, Samsung, Sony, Toshiba, and Osram, and small companies like Cambridge Display Technology (CDT), Universal Display Corporation (UDC), and eMagin. The first small molecular display for vehicular stereos was introduced in 1998, and polymer OLED displays have begun to appear in commercial products. Although displays are the major application for OLEDs at present, they are also candidates for nest generation solid-state lighting. In this case the light source needs to be white in most cases. Organic transistors, organic solar cells, etc. are also being developed vigorously.

Gang Li

2003-12-12T23:59:59.000Z

392

Why Did the LED Light Bulb Cross the Road? | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Why Did the LED Light Bulb Cross the Road? Why Did the LED Light Bulb Cross the Road? Why Did the LED Light Bulb Cross the Road? January 24, 2012 - 1:31pm Addthis Big Bill and Little Bill are here to talk with you about energy efficiency on behalf of Energy Impact Illinois. Roland Risser Roland Risser Program Director, Building Technologies Office How can I participate? You can view all of Big Bill and Little Bill's videos on the Energy Bill's YouTube channel. Everyone knows that laughter is good for you. Studies suggest it can buffer stress and increase your resistance to disease. Also, it just feels great to laugh. Advertisers have long used the allure of laughter to sell their products, and many Americans tune in to the Super Bowl just to chuckle at the funny commercials. However, when it comes to selling people on smart

393

Why Did the LED Light Bulb Cross the Road? | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Why Did the LED Light Bulb Cross the Road? Why Did the LED Light Bulb Cross the Road? Why Did the LED Light Bulb Cross the Road? January 24, 2012 - 1:31pm Addthis Big Bill and Little Bill are here to talk with you about energy efficiency on behalf of Energy Impact Illinois. Roland Risser Roland Risser Program Director, Building Technologies Office How can I participate? You can view all of Big Bill and Little Bill's videos on the Energy Bill's YouTube channel. Everyone knows that laughter is good for you. Studies suggest it can buffer stress and increase your resistance to disease. Also, it just feels great to laugh. Advertisers have long used the allure of laughter to sell their products, and many Americans tune in to the Super Bowl just to chuckle at the funny commercials. However, when it comes to selling people on smart

394

Engineering for Environmental Sustainability http://engineering.tufts.edu/ Energy-efficient Visible Light Communication  

E-Print Network (OSTI)

Light Communication What is the problem? The white light-emitting diode (LED) stands at the threshold

Tufts University

395

Photonic bands in two-dimensionally patterned multimode GaN waveguides for light extraction  

E-Print Network (OSTI)

have emerged as a reference blue-green solid-state light source. As for any light emitting diode LED

Recanati, Catherine

396

Three-color organic light-emitting diodes patterned by masked dye Florian Pschenitzka and J. C. Sturma)  

E-Print Network (OSTI)

Three-color organic light-emitting diodes patterned by masked dye diffusion Florian Pschenitzka of Physics. S0003-6951 99 02913-7 Organic light-emitting diodes OLEDs have demon- strated a remarkable

397

Effect of mechanical vibrations on light emitting diode luminaires.  

E-Print Network (OSTI)

??In this work, a LED and two types of Compact fluorescent lamps were investigated for the intensity variation due to mechanical vibrations in the range… (more)

Paladugu, Jayalakshmi

2009-01-01T23:59:59.000Z

398

Understanding Drooping Light Emitting Diodes CEEM | U.S. DOE...  

Office of Science (SC) Website

A RSS Feeds FeedbackShare Page Scientific Achievement New calculations demonstrate that LED "droop" is dominated by multi-particle interactions. Droop occurs when increasing...

399

Differential spectral responsivity measurement of photovoltaic detectors with a light-emitting-diode-based integrating sphere source  

SciTech Connect

We present an experimental realization of differential spectral responsivity measurement by using a light-emitting diode (LED)-based integrating sphere source. The spectral irradiance responsivity is measured by a Lambertian-like radiation field with a diameter of 40mm at the peak wavelengths of the 35 selectable LEDs covering a range from 280 to 1550nm. The systematic errors and uncertainties due to lock-in detection, spatial irradiance distribution, and reflection from the test detector are experimentally corrected or considered. In addition, we implemented a numerical procedure to correct the error due to the broad spectral bandwidth of the LEDs. The overall uncertainty of the DSR measurement is evaluated to be 2.2% (k=2) for Si detectors. To demonstrate its application, we present the measurement results of two Si photovoltaic detectors at different bias irradiance levels up to 120mW/cm{sup 2}.

Zaid, Ghufron; Park, Seung-Nam; Park, Seongchong; Lee, Dong-Hoon

2010-12-10T23:59:59.000Z

400

Communications and sensing of illumination contributions in a power led lighting system  

E-Print Network (OSTI)

Abstract — In recent years, LED technology emerged as a prime candidate for the future illumination light source, due to high energy efficiency and long life time. In addition, LEDs offer a superior flexibility in terms of colors and shapes, which leads to a potentially infinite variety of available light patterns. In order to create these patterns via easy user interaction, we need to sense the local light contribution of each LED. This measurement could be enabled through tagging of the light of each LED with unique embedded IDs. To this end, we propose a new modulation and multiple access scheme, named as codetime division multiple access- pulse position modulation (CTDMA-PPM): a form of PPM which is keyed according to a spreading sequence, and in which the duty cycle is subject to pulse width modulation (PWM) according to the required lighting setting. Our scheme considers illumination constraints in addition to the communication requirements and, to our best knowledge, it has not been addressed by other optical modulation methods. Based on the proposed modulation method and multiple access schemes, we develop a system structure, which includes illumination sources, a sensor receiver and a control system. Illumination sources illuminate the environment and transmit information, simultaneously. According to our theoretical analysis, this system structure could support a number of luminaries equal to the size of the CDMA codebook times the dimming range. I.

Jean-paul M. G. Linnartz; Lorenzo Feri; Hongming Yang; Sel B. Colak; Tim C. W. Schenk

2008-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "led light emitting" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

Sixth International Conference on Solid State Lighting, edited by Ian T. Ferguson, Nadarajah Narendran, Tsunemasa Taguchi, Ian E. Ashdown,  

E-Print Network (OSTI)

commercial white light emitting diodes (LEDs) rely on complicated fabrication methods to produce white light: Cadmium Selenide, Nanocrystal, Photoluminescence, Phosphor, White Light, Light Emitting Diode, LED 1. INTRODUCTION 1.1 Solid state lighting Solid state lighting, in the form of white light emitting diodes (LEDs

Weiss, Sharon

402

Background Overview of Solid-State Lighting  

NLE Websites -- All DOE Office Websites (Extended Search)

light sources Dramatic changes are unfolding in lighting technology. Semiconductor light-emitting diodes (LEDs), until recently used mainly as simple indicator lamps in...

403

Layering Mismatched Lattices Creates Long-Sought-After Green Light-Emitting Diode (Fact Sheet)  

SciTech Connect

Scientists at the National Renewable Energy Laboratory (NREL) invent a deep green LED that can lead to higher-efficiency white light, lower electric bills.

Not Available

2011-02-01T23:59:59.000Z

404

Interface electronic structures of organic light-emitting diodes with WO3 interlayer: A study by photoelectron spectroscopy  

E-Print Network (OSTI)

Interface electronic structures of organic light-emitting diodes with WO3 interlayer: A study injec- tion and transport layers in an organic light-emitting diode (OLED) structure has been studied B.V. All rights reserved. 1. Introduction OLEDs (organic light-emitting diodes) are display de

Kim, Sehun

405

The fabrication of small molecule organic light-emitting diode pixels by laser-induced forward transfer  

E-Print Network (OSTI)

The fabrication of small molecule organic light-emitting diode pixels by laser-induced forward online 23 January 2013) Laser-induced forward transfer (LIFT) is a versatile organic light-emitting diode, a modified LIFT process has been used to fabricate small molecule Alq3 organic light-emitting diodes (SMOLEDs

406

Sequential Printing by Laser-Induced Forward Transfer To Fabricate a Polymer Light-Emitting Diode Pixel  

E-Print Network (OSTI)

Sequential Printing by Laser-Induced Forward Transfer To Fabricate a Polymer Light-Emitting Diode-1015, Lausanne, Switzerland ABSTRACT: Patterned deposition of polymer light-emitting diode (PLED Organic light-emitting diodes (OLEDs) have been investigated in detail for nearly a quarter of a century,1

407

Red-green-blue polymer light-emitting diode pixels printed by optimized laser-induced forward transfer  

E-Print Network (OSTI)

Red-green-blue polymer light-emitting diode pixels printed by optimized laser-induced forward tri-color organic light-emitting diode (OLED) pixels. At reduced pressures, and with a defined donor already been used to fabricate basic small-molecule organic light-emitting diodes (OLEDs)2,3 and polymeric

408

4.2: Design of an Improved Pixel for a Polysilicon Active Matrix Organic Light Emitting Diode Display  

E-Print Network (OSTI)

4.2: Design of an Improved Pixel for a Polysilicon Active Matrix Organic Light Emitting Diode active matrix organic light emitting diode (AMOLED) pixel with high pixel to pixel luminance uniformity such as organic light emitting diodes (OLEDs) are presently of great interest due to their potential application

409

Polarization engineering via staggered InGaN quantum wells for radiative efficiency enhancement of light emitting diodes  

E-Print Network (OSTI)

of light emitting diodes Ronald A. Arif, Yik-Khoon Ee, and Nelson Tansu Citation: Appl. Phys. Lett. 91 extraction in GaN-based light emitting diodes Appl. Phys. Lett. 100, 061107 (2012) Electrically driven nanopyramid green light emitting diode Appl. Phys. Lett. 100, 061106 (2012) Ultraviolet electroluminescence

Gilchrist, James F.

410

Vacuum-free lamination of low work function cathode for efficient solution-processed organic light-emitting diodes  

E-Print Network (OSTI)

-coated organic light-emitting diode is transferred from a soft polydimethylsiloxane (PDMS) mold by lamination, or blade coating [1,2] for organic light emitting diode (OLED) as well as solar cell. The top electrodeVacuum-free lamination of low work function cathode for efficient solution-processed organic light-emitting

Meng, Hsin-Fei

411

High-density organic light emitting diodes by nanoimprint technology Krutarth Trivedi, Caleb Nelson, Li Tao, Mathew Goeckner, Walter Hua)  

E-Print Network (OSTI)

High-density organic light emitting diodes by nanoimprint technology Krutarth Trivedi, Caleb Nelson sources. Despite the considerable development of inorganic semiconductor based light emitting diodes of miniaturization to nanoscale. Organic light emitting diode (OLED) technology is immune to quantum confinement

Hu, Wenchuang "Walter"

412

Aspects of charge recombination and charge transport in organic solar cells and light-emitting devices  

E-Print Network (OSTI)

In this thesis, aspects of charge reconbination and charge transport in organic solar cells and light-emitting devices are presented. These devices show promise relative to traditional inorganic semiconductors. We show ...

Difley, Seth

2010-01-01T23:59:59.000Z

413

Storage of charge carriers on emitter molecules in organic light-emitting diodes  

E-Print Network (OSTI)

Organic light-emitting diodes (OLEDs) using the red phosphorescent emitter iridium(III)bis(2-methyldibenzo[f,h]quinoxaline) (acetylacetonate) [Ir(MDQ)[subscript 2](acac)] are studied by time-resolved electroluminescence ...

Reineke, Sebastian

414

Development of monolithic CMOS-compatible visible light emitting diode arrays on silicon  

E-Print Network (OSTI)

The synergies associated with integrating Si-based CMOS ICs and III-V-material-based light-emitting devices are very exciting and such integration has been an active area of research and development for quite some time ...

Chilukuri, Kamesh

2006-01-01T23:59:59.000Z

415

Method and apparatus for improving the performance of light emitting diodes  

DOE Patents (OSTI)

A method for increasing the resistance of a light emitting diode and other semiconductor devices to extremes of temperature is disclosed. During the manufacture of the light emitting diode, a liquid coating is applied to the light emitting die after the die has been placed in its lead frame. After the liquid coating has been placed on the die and its lead frames, a thermosetting encapsulant material is placed over the coating. The operation that cures the thermosetting material leaves the coating liquid intact. As the die and the encapsulant expand and contract at different rates with respect to changes in temperature, and as in known light emitting diodes the encapsulating material adheres to the die and lead frames, this liquid coating reduces the stresses that these different rates of expansion and contraction normally cause by eliminating the adherence of the encapsulating material to the die and frame.

Lowery, Christopher H. (Fremont, CA); McElfresh, David K. (Union City, CA); Burchet, Steve (Cedar Crest, NM); Adolf, Douglas B. (Albuquerque, NM); Martin, James (Tijeras, NM)

1996-01-01T23:59:59.000Z

416

Components, production processes, and recommendations for future research in organic light emitting diodes  

E-Print Network (OSTI)

Organic Light Emitting Diodes (OLEDs) are small, optoelectronic devices that can be used in the production of energy-efficient, high definition displays in cell phones, computers, and televisions. These devices have great ...

Hunting, Lindsay (Lindsay E.)

2009-01-01T23:59:59.000Z

417

Biomedical devices from ultraviolet LEDs  

NLE Websites -- All DOE Office Websites (Extended Search)

Biomedical devices from ultraviolet LEDs Biomedical devices from ultraviolet LEDs Light-emitting nanocrystal diodes go ultraviolet Biomedical devices with active components could be made from nanostructured systems. February 24, 2012 Researcher working with nanocrystals A researcher at LANL works with nanocrystals. Get Expertise Researcher Sergio Brovelli Physical Chem & Applied Spectroscopy Email Research Team Leader Alberto Paleari University of Milano-Bicocca in Italy Such devices could, for example, selectively activate light-sensitive drugs for better medical treatment or probe for the presence of fluorescent markers in medical diagnostics. LEDs produce light in the ultraviolet range A process for creating glass-based, inorganic light-emitting diodes (LEDs) that produce light in the ultraviolet range has been developed by a

418

Zinc Oxide and Nitride Nanowire Based Light Emitting Diodes  

E-Print Network (OSTI)

light sources have wasted emission and energy as can be seenor in other words, wasted electrical energy). Extraction

Lai, Elaine Michelle

2009-01-01T23:59:59.000Z

419

Technical Feasibility Assessment of LED Roadway Lighting on the Golden Gate Bridge  

Science Conference Proceedings (OSTI)

Subsequent to preliminary investigations by the Golden Gate Bridge Highway & Transportation District (GGB), in coordination with Pacific Gas & Electric (PG&E), the GATEWAY Demonstration program was asked to evaluate the technical feasibility of replacing existing roadway lighting on the bridge with products utilizing LED technology. GGB and PG&E also indicated interest in induction (i.e., electrodeless fluorescent) technology, since both light source types feature rated lifetimes significantly exceeding those of the existing high-pressure sodium (HPS) and low-pressure sodium (LPS) products. The goal of the study was to identify any solutions which would reduce energy use and maintenance without compromising the quantity or quality of existing illumination. Products used for roadway lighting on the historic bridge must be installed within the existing amber-lensed shoebox-style luminaire housings. It was determined that induction technology does not appear to represent a viable alternative for the roadway luminaires in this application; any energy savings would be attributable to a reduction in light levels. Although no suitable LED retrofit kits were identified for installation within existing luminaire housings, several complete LED luminaires were found to offer energy savings of 6-18%, suggesting custom LED retrofit kits could be developed to match or exceed the performance of the existing shoeboxes. Luminaires utilizing ceramic metal halide (CMH) were also evaluated, and some were found to offer 28% energy savings, but these products might actually increase maintenance due to the shorter rated lamp life. Plasma technology was evaluated, as well, but no suitable products were identified. Analysis provided in this report was completed in May 2012. Although LED technologies are expected to become increasingly viable over time, and product mock-ups may reveal near-term solutions, some options not currently considered by GGB may ultimately merit evaluation. For example, it would be preferable in terms of performance to simply replace existing luminaires (some of which may already be nearing end of life) with fully-integrated LED or CMH luminaires rather than replacing internal components. Among other benefits, this would allow reputable manufacturers to offer standard warranties for their products. Similarly, the amber lenses might be reformulated such that they do not render white light sources in a greenish cast, thereby allowing the use of off-the-shelf LED or CMH products. Last, it should be noted that the existing amber-lensed shoeboxes bear no daytime resemblance to the LPS luminaires originally used to light the roadway.

Tuenge, Jason R.

2012-09-01T23:59:59.000Z

420

Diode (LED) Fixture Design and Installation Criteria for Interior and Exterior Lighting Applications  

E-Print Network (OSTI)

1. Purpose. This ETL provides technical guidance and criteria for specifying, designing, and installing LED luminaires for interior and exterior lighting applications at Air Force installations. It supersedes ETL 10-18 of the same title, dated 13 December 2010. It updates guidance in ETL 10-18 regarding: (1) required calculations for LED investment decisions; (2) retrofit design requirements; (3) applicable prohibitions; and (4) environmental considerations. Requirements in this ETL are mandatory. Deviations require approval from the Air Force Electrical SME, HQ AFCESA/CEOA. Requests for deviations must be coordinated through the MAJCOM before submitting to HQ AFCESA/CEOA. Note: LED applications not specifically addressed in this ETL or Unified Facilities Criteria (UFC) 3-530-01, Interior and Exterior Lighting and Controls, require HQ AFCESA/CEOA approval. Note: Use of the name or mark of any specific manufacturer, commercial product, commodity, or service in this ETL does not imply endorsement by the Air Force. Summary of Revisions: Corrected references to applicable ETLs. 2. Application. This ETL does not apply to LED airfield lighting systems, including, but

unknown authors

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "led light emitting" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

An Engineering-Economic Analysis of White Light-Emitting Diodes for General  

NLE Websites -- All DOE Office Websites (Extended Search)

An Engineering-Economic Analysis of White Light-Emitting Diodes for General An Engineering-Economic Analysis of White Light-Emitting Diodes for General Illumination for the U.S. Residential and Commercial Sectors Speaker(s): InĂŞs Magarida Lima de Azevedo Date: February 15, 2008 - 12:00pm Location: 90-3122 Because lighting constitutes more than 20% of total US electricity consumption, and many current lighting technologies are highly inefficient, improved technologies for lighting hold great potential for energy savings and for reducing associated greenhouse gas emissions. Solid-state lighting is a technology that shows great promise as a source of efficient, affordable, color-balanced white light in the near future. Indeed, under a pure engineering-economic analysis, solid-state lighting already performs better than incandescent bulbs and is expected to surpass the most

422

Diode (LED) Fixture Design and Installation Criteria for Interior and Exterior Lighting Applications  

E-Print Network (OSTI)

1. Purpose. This ETL provides technical guidance and criteria for specifying, designing, and installing LED luminaires for interior and exterior lighting applications at Air Force installations. It supersedes ETL 12-4 of the same title, dated 17 February 2012. Requirements in this ETL are mandatory. Deviations require approval from the Air Force Electrical SME, AFCEC/COS. Requests for deviations must be coordinated through the MAJCOM before submitting to AFCEC/CO. Note: LED applications not specifically addressed in this ETL or Unified Facilities Criteria (UFC) 3-530-01, Interior and Exterior Lighting and Controls, require AFCESA/CEOA approval. Note: Use of the name or mark of any specific manufacturer, commercial product, commodity, or service in this ETL does not imply endorsement by the Air Force. 2. Summary of Revisions: Updates reference (paragraph 4.3). 3. Application. This ETL does not apply to LED airfield lighting systems, including, but not limited to, taxiway, obstruction, runway edge, threshold, or approach lighting

Tyndall Air; Force Base Florida

2007-01-01T23:59:59.000Z

423

Tunnel junction multiple wavelength light-emitting diodes  

DOE Patents (OSTI)

A multiple wavelength LED having a monolithic cascade cell structure comprising at least two p-n junctions, wherein each of said at least two p-n junctions have substantially different band gaps, and electrical connector means by which said at least two p-n junctions may be collectively energized; and wherein said diode comprises a tunnel junction or interconnect. 5 figs.

Olson, J.M.; Kurtz, S.R.

1992-11-24T23:59:59.000Z

424

Tunnel junction multiple wavelength light-emitting diodes  

DOE Patents (OSTI)

A multiple wavelength LED having a monolithic cascade cell structure comprising at least two p-n junctions, wherein each of said at least two p-n junctions have substantially different band gaps, and electrical connector means by which said at least two p-n junctions may be collectively energized; and wherein said diode comprises a tunnel junction or interconnect.

Olson, Jerry M. (Lakewood, CO); Kurtz, Sarah R. (Golden, CO)

1992-01-01T23:59:59.000Z

425

Self-reported Impacts of LED Lighting Technology Compared to Fuel-based Lighting on Night Market Business Prosperity in Kenya  

E-Print Network (OSTI)

Time period Pre 07/2008 Lighting Technology (Nightly Cost,2 Self-reported Impacts of LED Lighting Technology Comparedto Fuel-based Lighting on Night Market Business Prosperity

Johnstone, Peter

2009-01-01T23:59:59.000Z

426

All inorganic colloidal quantum dot LEDs  

E-Print Network (OSTI)

This thesis presents the first colloidal quantum dot light emitting devices (QD-LEDs) with metal oxide charge transport layers. Colloidally synthesized quantum dots (QDs) have shown promise as the active material in ...

Wood, Vanessa Claire

2007-01-01T23:59:59.000Z

427

LED Exit Signs Tech Sheet Final Version  

NLE Websites -- All DOE Office Websites (Extended Search)

SAVE ENERGY, MONEY AND PREVENT POLLUTION WITH LIGHT-EMITTING DIODE (LED) EXIT SIGNS Illuminated exit signs are an important and legally required safety feature in your facility. In...

428

Semiconductor-Nanocrystals-Based White Light-Emitting Diodes  

Science Conference Proceedings (OSTI)

In response to the demands for energy and the concerns of global warming and climate change, energy efficient and environmentally friendly solid-state lighting, such as white lightemitting diodes (WLEDs), is considered to be the most promising and suitable light source. Because of their small size, high efficiency, and long lifetime, WLEDs based on colloidal semiconductor nanocrystals (or quantum dots) are emerging as a completely new technology platform for the development of flat-panel displays and solid-state lighting, exhibiting the potential to replace the conventionally used incandescent and fluorescent lamps. This replacement can cut the ever-increasing level of energy consumption, solve the problem of rapidly depleting fossil fuel reserves, and improve the quality of the global environment. In this review, the recent progress in semiconductor-nanocrystals-based WLEDs is highlighted, the different approaches for generating white light are compared, and the benefits and challenges of the solid-state lighting technology are discussed.

Dai, Quanqin [ORNL; Duty, Chad E [ORNL; Hu, Michael Z. [ORNL

2010-01-01T23:59:59.000Z

429

Development of Advanced Manufacturing Methods for Warm White LEDs for General Lighting  

Science Conference Proceedings (OSTI)

GE Lighting Solutions will develop precise and efficient manufacturing techniques for the “remote phosphor” platform of warm-white LED products. In volume, this will be demonstrated to drive significant materials, labor and capital productivity to achieve a maximum possible 53% reduction in overall cost. In addition, the typical total color variation for these white LEDs in production will be well within the ANSI bins and as low as a 4-step MacAdam ellipse centered on the black body curve. Achievement of both of these objectives will be demonstrated while meeting a performance target of > 75 lm/W for a warm-white LED and a reliability target of <30% lumen drop / <2-step MacAdam ellipse shift, estimated over 50,000 hrs.

Deshpande, Anirudha; Kolodin, Boris; Jacob, Cherian; Chowdhury, Ashfaqul; Kuenzler, Glenn; Sater, Karen; Aesram, Danny; Glaettli, Steven; Gallagher, Brian; Langer, Paul; Setlur, Anant; Beers, Bill

2012-03-31T23:59:59.000Z

430

Future Challenges and Directions for Nitride Materials and Light Emitters  

E-Print Network (OSTI)

. Keywords--High-temperature techniques, light emitting diodes, materials science and technology@meijo-u.ac.jp). Publisher Item Identifier S 0018-9219(97)08491-0. blue light emitting diode (LED) devices emitted

Wetzel, Christian M.

431

Soft holographic interference lithography microlens for enhanced organic light emitting diode light extraction  

SciTech Connect

Very uniform 2 {micro}m-pitch square microlens arrays ({micro}LAs), embossed on the blank glass side of an indium-tin-oxide (ITO)-coated 1.1 mm-thick glass, are used to enhance light extraction from organic light-emitting diodes (OLEDs) by {approx}100%, significantly higher than enhancements reported previously. The array design and size relative to the OLED pixel size appear to be responsible for this enhancement. The arrays are fabricated by very economical soft lithography imprinting of a polydimethylsiloxane (PDMS) mold (itself obtained from a Ni master stamp that is generated from holographic interference lithography of a photoresist) on a UV-curable polyurethane drop placed on the glass. Green and blue OLEDs are then fabricated on the ITO to complete the device. When the {mu}LA is {approx}15 x 15 mm{sup 2}, i.e., much larger than the {approx}3 x 3 mm{sup 2} OLED pixel, the electroluminescence (EL) in the forward direction is enhanced by {approx}100%. Similarly, a 19 x 25 mm{sup 2} {mu}LA enhances the EL extracted from a 3 x 3 array of 2 x 2 mm{sup 2} OLED pixels by 96%. Simulations that include the effects of absorption in the organic and ITO layers are in accordance with the experimental results and indicate that a thinner 0.7 mm thick glass would yield a {approx}140% enhancement.

Park, Joong-Mok; Gan, Zhengqing; Leung, Wai Y.; Liu, Rui; Ye, Zhuo; Constant, Kristen; Shinar, Joseph; Shinar, Ruth; Ho, Kai-Ming

2011-06-06T23:59:59.000Z

432

Improved property in organic light-emitting diode utilizing two Al/Alq3 layers  

Science Conference Proceedings (OSTI)

We reported on the fabrication of organic light-emitting devices (OLEDs) utilizing the two Al/Alq"3 layers and two electrodes. This novel green device with structure of Al(110nm)/tris(8-hydroxyquinoline) aluminum (Alq"3)(65nm)/Al(110nm)/Alq"3(50nm)/N,N'-dipheny1-N, ... Keywords: Emitting layer, OLEDS, Transporting layer

Chunlin Zhang; Su Liu; Fangcong Wang; Yong Zhang

2008-12-01T23:59:59.000Z

433

Green emitting phosphors and blends thereof  

DOE Patents (OSTI)

Phosphor compositions, blends thereof and light emitting devices including white light emitting LED based devices, and backlights, based on such phosphor compositions. The devices include a light source and a phosphor material as described. Also disclosed are phosphor blends including such a phosphor and devices made therefrom.

Setlur, Anant Achyut (Niskayuna, NY); Siclovan, Oltea Puica (Rexford, NY); Nammalwar, Prasanth Kumar (Bangalore, IN); Sathyanarayan, Ramesh Rao (Bangalore, IN); Porob, Digamber G. (Goa, IN); Chandran, Ramachandran Gopi (Bangalore, IN); Heward, William Jordan (Saratoga Springs, NY); Radkov, Emil Vergilov (Euclid, OH); Briel, Linda Jane Valyou (Niskayuna, NY)

2010-12-28T23:59:59.000Z

434

Seventh International Conference on Solid State Lighting, Edited by Ian T. Ferguson, Nadarajah Narendran, Tsunemasa Taguchi, Ian E. Ashdown,  

E-Print Network (OSTI)

Selenide, Nanocrystal, Photoluminescence, Phosphor, White Light, Light Emitting Diode, LED 1. INTRODUCTION 1.1 Solid state lighting and white-light LEDs The use of white light emitting diodes (LEDs emitting diodes[11] , though they are a less mature technology as compared to inorganic semiconductor

Weiss, Sharon

435

SciTech Connect: "light emitting diode"  

Office of Scientific and Technical Information (OSTI)

"light emitting diode" Find "light emitting diode" Find How should I search Scitech Connect ... Basic or Advanced? Basic Search Advanced Ă— Advanced Search Options Full Text: Bibliographic Data: Creator / Author: Name Name ORCID Title: Subject: Identifier Numbers: Research Org.: Sponsoring Org.: Site: All Alaska Power Administration, Juneau, Alaska (United States) Albany Research Center (ARC), Albany, OR (United States) Albuquerque Complex - NNSA Albuquerque Operations Office, Albuquerque, NM (United States) Amarillo National Resource Center for Plutonium, Amarillo, TX (United States) Ames Laboratory (AMES), Ames, IA (United States) Argonne National Laboratory (ANL), Argonne, IL (United States) Argonne National Laboratory-Advanced Photon Source (United States) Atlanta Regional Office,

436

Is LED use in traffic signals viable in the Texas Department of Transportation, Houston District?.  

E-Print Network (OSTI)

??Light Emitting Diode (LED) is used in traffic signals and highway illumination in the Texas Department of Transportation, Houston District (TxDOT). The thesis focuses on… (more)

Ughanze, Ugonna Uzodinma

2012-01-01T23:59:59.000Z

437

Types of Lighting | Department of Energy  

NLE Websites -- All DOE Office Websites (Extended Search)

selection. Types of lighting include: Fluorescent Incandescent Outdoor solar Light-emitting diode (LED) Also learn how energy-efficient lightbulbs compare to traditional...

438

Ruofan Wu, Hieu Pham Trung Nguyen and Zetian Mi INTRODUCTION TO LEDs  

E-Print Network (OSTI)

-in-a-Wire Light Emitting Diodes and Prevention Method Nano-electronic Devices and Materials, Electrical Computer., Efficiency droop in nitride-based light-emitting diodes. Physica Status Solidi a-Applications and Materials history. Nature Photonics 2007, 1 (4), 189-192. [4] Holonyak, N., Is the light emitting diode (LED

Barthelat, Francois

439

Coupled optical and electronic simulations of electrically pumped photonic-crystal-based LEDs  

E-Print Network (OSTI)

to investigate design tradeoffs in electrically pumped photonic crystal light emitting diodes. A finite. Keywords: Photonic crystal light emitting diode, electrically pumped device 1. INTRODUCTION Recently optoelectronic devices, such as light emitting diodes (LEDs) and lasers. It has been suggested that a thin slab

Dutton, Robert W.

440

Digital Architecture for Driving Large LED Arrays with Dynamic Bus Voltage Regulation and Phase Shifted PWM  

E-Print Network (OSTI)

. Y. Tsao, "Light Emitting Diodes (LEDs) fi OIDA Technology Roadmap Update 2002 Development/Graphics/00038951_0.pdf ~d system efficiency at [16] E. F. Schubert, Light-Emitting Diodes, 2nd Edition, Cambridge, "Development of High Power Green digital control driving Light Emitting Diode Chips", MRS Internet Journal

Note: This page contains sample records for the topic "led light emitting" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

Two-color photoionization of calcium using SHG and LED light  

E-Print Network (OSTI)

We present a photoionization method to load single 40Ca ions in a linear Paul trap from an atomic beam. Neutral Ca I atoms are resonantly excited from the ground state to the intermediate 4s4p 1P_1-level using coherent 423nm radiation produced by single-pass second harmonic generation in a periodically poled KTiOPO_4 crystal pumped with an 120mW extended cavity diode laser. Ionization is then attained with a high-power light emitting diode imaged to the trap center, using an appropriately designed optical system composed of standard achromatic doublet lenses. The setup simplifies previous implementations at similar efficiency, and it hardly requires any maintenance at all.

C. Schuck; F. Rohde; M. Almendros; M. Hennrich; J. Eschner

2009-11-19T23:59:59.000Z

442

DC sputtered indium-tin oxide transparent cathode for organic light-emitting diodes  

E-Print Network (OSTI)

Abstract—The performance of top-emitting organic light-emitting diodes depends not just on the choice of the transparent cathodes but also on their techniques of formation. Compared to the damage induced by radio frequency sputtering of indium-tin oxide cathode, that induced by dc sputtering was verified to be less severe and relatively independent of the sputtering power. Consequently, a high dc sputtering power of 120 W could be employed to achieve a high deposition rate of 0.1 nm/s. Adequate emission efficiency was maintained, even with a relatively thin 7-nm copper (II) phthalocyanine buffer layer. Index Terms—Indium-tin oxide, organic light-emitting diodes, sputtering, top-emission, transparent cathode. I.

Haiying Chen; Chengfeng Qiu; Man Wong; Hoi Sing Kwok

2003-01-01T23:59:59.000Z

443

Lighting the Way with Compact Fluorescent Lighting | Department...  

NLE Websites -- All DOE Office Websites (Extended Search)

and compact fluorescent lights. And I've already purchased a few of the new light emitting diode (LED) solid-state lighting lights-but that's the topic of a future blog. Stay...

444

Solid-State Lighting: Standards Development for Solid-State Lighting  

NLE Websites -- All DOE Office Websites (Extended Search)

IES G-2, Guideline for the Application of General Illumination ("White") Light-Emitting Diode (LED) Technologies Provides lighting and design professionals with a general...

445

National Initiatives and Programs in Solid-State Lighting  

NLE Websites -- All DOE Office Websites (Extended Search)

these results is called "The Promise of Solid-State Lighting for General Illumination: Light Emitting Diodes and Organic Light Emitting Diodes" (pdf - 329kb). The full SSL-LED...

446

Measurements of the Cerenkov light emitted by a TeO2 crystal  

E-Print Network (OSTI)

Bolometers have proven to be good instruments to search for rare processes because of their excellent energy resolution and their extremely low intrinsic background. In this kind of detectors, the capability of discriminating alpha particles from electrons represents an important aspect for the background reduction. One possibility for obtaining such a discrimination is provided by the detection of the Cerenkov light which, at the low energies of the natural radioactivity, is only emitted by electrons. In this paper, the results of the analysis of the light emitted by a TeO2 crystal at room temperature when transversed by a cosmic ray are reported. Light is promptly emitted after the particle crossing and a clear evidence of its directionality is also found. These results represent a strong indication that Cerenkov light is the main, if not even the only, component of the light signal in a TeO2 crystal. They open the possibility to make large improvements in the performance of experiments based on this kind of materials

F. Bellini; N. Casali; I. Dafinei; M. Marafini; S. Morganti; F. Orio; D. Pinci; M. Vignati; C. Voena

2012-09-27T23:59:59.000Z

447

Current injection efficiency induced efficiency-droop in InGaN quantum well light-emitting diodes  

E-Print Network (OSTI)

Current injection efficiency induced efficiency-droop in InGaN quantum well light-emitting diodes]. The detail of the model for current injection model for quantum well heterostructure is described in Ref. [18 Keywords: III-Nitride InGaN QWs Light-emitting diodes Efficiency-droop a b s t r a c t Current injection

Gilchrist, James F.

449

Advanced Lighting Technologies:Energy Efficiency and Power Quality of Lighting Sources  

Science Conference Proceedings (OSTI)

his EPRI technical update is the third in a series of technical assessments of advanced lighting technologies. A total of seven lighting products were assessed in 2013: low cost screw based light-emitting diode (LED) lamps, retrofit LED ceiling fixtures, suspended LED fixtures, LED-based 2x4 troffers, LED high bay fixtures, innovative LED screw based lamps, and LED hospitality lighting. Prior to beginning an in-depth assessment, the EPRI Lighting Group evaluated each of the tested technologies to ...

2013-12-12T23:59:59.000Z

450

Solid-State Lighting: 2012 Solid-State Lighting Manufacturing...  

NLE Websites -- All DOE Office Websites (Extended Search)

Frank Cerio, Veeco Instruments Advanced Epi Tools for Gallium Nitride Light Emitting Diode Devices Vivek Agrawal, Applied Materials Driving Down HB-LED Costs:...

451

SciTech Connect: "light emitting diodes"  

Office of Scientific and Technical Information (OSTI)

light emitting diodes" Find light emitting diodes" Find How should I search Scitech Connect ... Basic or Advanced? Basic Search Advanced Ă— Advanced Search Options Full Text: Bibliographic Data: Creator / Author: Name Name ORCID Title: Subject: Identifier Numbers: Research Org.: Sponsoring Org.: Site: All Alaska Power Administration, Juneau, Alaska (United States) Albany Research Center (ARC), Albany, OR (United States) Albuquerque Complex - NNSA Albuquerque Operations Office, Albuquerque, NM (United States) Amarillo National Resource Center for Plutonium, Amarillo, TX (United States) Ames Laboratory (AMES), Ames, IA (United States) Argonne National Laboratory (ANL), Argonne, IL (United States) Argonne National Laboratory-Advanced Photon Source (United States) Atlanta Regional Office, Atlanta, GA (United States) Atmospheric Radiation Measurement (ARM)

452

Over the past decade, lighting became more efficient across ...  

U.S. Energy Information Administration (EIA)

"Other" includes light-emitting diode (LED) lamps as well as other lamps such as fiber optic lights, induction lamps, and lamps of unknown ...

453

The Impact of the Transient Response of 0rg;anic Light Emitting Diodes on the Design of Active Matrix OLED Displays  

E-Print Network (OSTI)

The Impact of the Transient Response of 0rg;anic Light Emitting Diodes on the Design of Active, Princeton, NJ, U.S.A. Abstract Much of the organic light emitting diode (OLED) characterization published

454

The History of the Light Bulb | Department of Energy  

NLE Websites -- All DOE Office Websites (Extended Search)

Future is Here One of the fastest developing lighting technologies today is the light-emitting diode (or LED). A type of solid-state lighting, LEDs use a semiconductor to convert...

455

Solid-State Lighting: Guided Bus Tour-LEDs in Action  

NLE Websites -- All DOE Office Websites (Extended Search)

building and the nature it encloses. Learn how Phipps uses LEDs to support a net zero, Living Building architectural approach See unique uses of LEDs in a botanical garden and...

456

Pulsed Single-Photon Resonant Cavity Quantum Dot LED  

Science Conference Proceedings (OSTI)

Previously, the authors demonstrated single-photon emission of cw-operated InP QDs up to at least 80 K in a simple light emitting diode (LED) configuration [2].

457

Space charge spectroscopy of integrated quantum well infrared photodetectorlight emitting diode  

E-Print Network (OSTI)

Space charge spectroscopy of integrated quantum well infrared photodetector±light emitting diode M ± light emitting diode (QWIP-LED). Quasistatic capacitance±voltage (C±V ) characteristics under reverse.V. All rights reserved. Keywords: Quantum-well infrared photodetector; Light-emitting diode; Space charge

Matsik, Steven G.

458

InP-Based Oxide-Confined 16 p.m Microcavity Light Emitting Diodes Weidong Zhou, Omar Qasaimeh, and Pallab Bhattacharya  

E-Print Network (OSTI)

InP-Based Oxide-Confined 16 p.m Microcavity Light Emitting Diodes Weidong Zhou, Omar Qasaimeh light emitting diodes (MCLEDs) have been designed, fabricated and characterized. Oxide- confined MCLEDs region emission peak and cavity resonance peak. Key words: Microcavity light emitting diode (MCLED), wet

Zhou, Weidong

459

Solid-State Lighting Home Page for Semiconductor light emitting diodes  

NLE Websites -- All DOE Office Websites (Extended Search)

Since 04/21/2002 Since 04/21/2002 Solid-State Lighting Archival Website As of September 1, 2006, this website is not being actively maintained. We hope that the collected news items, tracking reports, literature summaries, and links to various industry resources will be of archival value to the SSL community. Please visit Sandia's current and active Solid-State Lighting Energy Frontier Research Center website at http://ssls.sandia.gov/. Solid-State Lighting Science Energy Frontier Research Center The Mission of this site was to provide a comprehensive portal to the emerging knowledge that will enable the promise of solid-state lighting The site was active between December 2001 and September 2006, and the goal was: " Â… to gather together information relevant to solid-state lighting, and

460

Surface plasmon enhanced InGaN light emitter Koichi Okamoto*a  

E-Print Network (OSTI)

is a very promising method for developing the super bright light emitting diodes (LEDs). Moreover, we foundGaN/GaN, light emitting diode, quantum well, internal quantum efficiency, solid-state light source 1. INTRODUCTION Since 1993, InGaN quantum wells (QW)-based light emitting diodes (LEDs) have been continuously

Okamoto, Koichi

Note: This page contains sample records for the topic "led light emitting" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

The synthesis of inorganic semiconductor nanocrystalline materials for the purpose of creating hybrid organic/inorganic light-emitting devices  

E-Print Network (OSTI)

Colloidal semiconductor nanocrystals (NCs) or quantum dots (QDs) can be synthesized to efficiently emit light from the ultraviolet, across the entire visible spectrum, and into the near infrared. This is now possible due ...

Steckel, Jonathan S. (Jonathan Stephen)

2006-01-01T23:59:59.000Z

462

Illuminating the Pecking Order in Off-Grid Lighting: A Demonstration of LED Lighting for Saving Energy in the Poultry Sector  

Science Conference Proceedings (OSTI)

The Lumina Project and Lighting Africa conducted a full-scale field test involving a switch from kerosene to solar-LED lighting for commercial broiler chicken production at an off-grid farm in Kenya. The test achieved lower operating costs, produced substantially more light, improved the working environment, and had no adverse effect on yields. A strategy using conventional solar-fluorescent lighting also achieved comparable yields, but entailed a six-fold higher capital cost and significantly higher recurring battery replacement costs. Thanks to higher energy and optical efficiencies, the LED system provided approximately twice the illumination to the chicken-production area and yet drew less than half the power.At the study farm, 3000 chickens were grown in each of three identical houses under kerosene, fluorescent, and LED lighting configurations. Under baseline conditions, a yearly expenditure of 1,200 USD is required to illuminate the three houses with kerosene. The LED system eliminates this fuel use and expense with a corresponding simple payback time of 1.5 years, while the solar-fluorescent system has a payback time of 9.3 years. The corresponding reduction in fuel expenditure in both cases represents a 15percent increase in after-tax net income (revenues minus expenses) across the entire business operation. The differential cost-effectiveness between the LED and fluorescent systems would be substantially greater if the fluorescent system were upsized to provide the same light as the LED system. Providing light with the fluorescent or LED systems is also far more economical than connecting to the grid in this case. The estimated grid-connection cost at this facility is 1.7 million Kenya Schillings (approximately 21,250 USD), which is nearly six-times the cost of the fluorescent system and 35-times the cost of the LED system.The LED system also confers various non-energy benefits. The relative uniformity of LED lighting, compared to the fluorescent or kerosene lighting, reduced crowding which in turn created a less stressful environment for the chickens. The far higher levels of illumination also created a better environment for the workers, while eliminating the time required for obtaining fuel and maintaining kerosene lanterns. An additional advantage of the LED system relative to the solar fluorescent system was that the former does not require a skilled technician to carry out the installation. The portable LED system lighting layout is also more easily adjusted than that of the hardwired fluorescent systems. Furthermore, switching to the LED system avoids over one metric ton of carbon dioxide emissions per house on an annual basis compared to kerosene. There is high potential for replication of this particular LED lighting strategy in the developing world. In order to estimate the scale of kerosene use and the potential for savings, more information is needed on the numbers of chickens produced off-grid, as well as lighting uses for other categories of poultry production (egg layers, indigenous broilers ). Our discovery that weight gain did not slow in the solar-fluorescent house after it experienced extended lighting outages beginning on day 14 of the 35-day study suggests that conventional farming practices in Kenyan broiler operations may call for more hours of lighting than is needed to achieve least-cost production.

Tracy, Jennifer; Mills, Evan

2010-11-06T23:59:59.000Z

463

ZnO PN Junctions for Highly-Efficient, Low-Cost Light Emitting Diodes  

SciTech Connect

By 2015, the US Department of Energy has set as a goal the development of advanced solid state lighting technologies that are more energy efficient, longer lasting, and more cost-effective than current technology. One approach that is most attractive is to utilize light-emitting diode technologies. Although III-V compound semiconductors have been the primary focus in pursuing this objective, ZnO-based materials present some distinct advantages that could yield success in meeting this objective. As with the nitrides, ZnO is a direct bandgap semiconductor whose gap energy (3.2 eV) can be tuned from 3.0 to 4 eV with substitution of Mg for higher bandgap, Cd for lower bandgap. ZnO has an exciton binding energy of 60 meV, which is larger than that for the nitrides, indicating that it should be a superior light emitting semiconductor. Furthermore, ZnO thin films can be deposited at temperatures on the order of 400-600 C, which is significantly lower than that for the nitrides and should lead to lower manufacturing costs. It has also been demonstrated that functional ZnO electronic devices can be fabricated on inexpensive substrates, such as glass. Therefore, for the large-area photonic application of solid state lighting, ZnO holds unique potential. A significant impediment to exploiting ZnO in light-emitting applications has been the absence of effective p-type carrier doping. However, the recent realization of acceptor-doped ZnO material overcomes this impediment, opening the door to ZnO light emitting diode development In this project, the synthesis and properties of ZnO-based pn junctions for light emitting diodes was investigated. The focus was on three issues most pertinent to realizing a ZnO-based solid state lighting technology, namely (1) achieving high p-type carrier concentrations in epitaxial and polycrystalline films, (2) realizing band edge emission from pn homojunctions, and (3) investigating pn heterojunction constructs that should yield efficient light emission. The project engaged established expertise at the University of Florida in ZnO film growth (D. Norton), device fabrication (F. Ren) and wide bandgap photonics (S. Pearton). It addressed p-type doping and junction formation in (Zn,Mg)O alloy thin films. The project employed pulsed laser deposition for film growth. The p-type dopant of interest was primarily phosphorus, given the recent results in our laboratory and elsewhere that this anions can yield p-type ZnO-based materials. The role of Zn interstitials, oxygen vacancies, and/or hydrogen complexes in forming compensating shallow donor levels imposes the need to simultaneously consider the role of in situ and post-growth processing conditions. Temperature-dependent Hall, Seebeck, C-V, and resistivity measurements was used to determine conduction mechanisms, carrier type, and doping. Temperature-dependent photoluminescence was used to determine the location of the acceptor level, injection efficiency, and optical properties of the structures. X-ray diffraction will used to characterize film crystallinity. Using these materials, the fabrication and characterization of (Zn,Mg)O pn homojunction and heterojunction devices was pursued. Electrical characterization of the junction capacitance and I-V behavior was used to extract junction profile and minority carrier lifetime. Electroluminescence from biased junctions was the primary property of interest.

David P. Norton; Stephen Pearton; Fan Ren

2007-09-30T23:59:59.000Z

464

THE ASSESSMENT OF HIGH DYNAMIC RANGE LUMINANCE MEASUREMENTS WITH LED LIGHTING.  

E-Print Network (OSTI)

??This research investigates whether a High Dynamic Range Imaging (HDRI) technique can accurately capture luminance values of a single LED chip. Previous studies show that… (more)

Tyukhova, Yulia I.

2012-01-01T23:59:59.000Z

465

Demonstration Assessment of LED Roadway Lighting: NE Cully Boulevard Portland, OR  

Science Conference Proceedings (OSTI)

A new roadway lighting demonstration project was initiated in late 2010, which was planned in conjunction with other upgrades to NE Cully Boulevard, a residential collector road in the northeast area of Portland, OR. With the NE Cully Boulevard project, the Portland Bureau of Transportation hoped to demonstrate different light source technologies and different luminaires side-by-side. This report documents the initial performance of six different newly installed luminaires, including three LED products, one induction product, one ceramic metal halide product, and one high-pressure sodium (HPS) product that represented the baseline solution. It includes reported, calculated, and measured performance; evaluates the economic feasibility of each of the alternative luminaires; and documents user feedback collected from a group of local Illuminating Engineering Society (IES) members that toured the site. This report does not contain any long-term performance evaluations or laboratory measurements of luminaire performance. Although not all of the installed products performed equally, the alternative luminaires generally offered higher efficacy, more appropriate luminous intensity distributions, and favorable color quality when compared to the baseline HPS luminaire. However, some products did not provide sufficient illumination to all areas—vehicular drive lanes, bicycle lanes, and sidewalks—or would likely fail to meet design criteria over the life of the installation due to expected depreciation in lumen output. While the overall performance of the alternative luminaires was generally better than the baseline HPS luminaire, cost remains a significant barrier to widespread adoption. Based on the cost of the small quantity of luminaires purchased for this demonstration, the shortest calculated payback period for one of the alternative luminaire types was 17.3 years. The luminaire prices were notably higher than typical prices for currently available luminaires purchased in larger quantities. At prices that are more typical, the payback would be less than 10 years. In addition to the demonstration luminaires, a networked control system was installed for additional evaluation and demonstration purposes. The capability of control system to measure luminaire input power was explored in this study. A more exhaustive demonstration and evaluation of the control system will be the subject of future GATEWAY report(s).

Royer, Michael P.; Poplawski, Michael E.; Tuenge, Jason R.

2012-06-29T23:59:59.000Z

466

AlGaInN-based light emitting diodes with a transparent p-contact based on thin ITO films  

SciTech Connect

A method for obtaining transparent conductive ITO (indium-tin oxide) films aimed for use in light emitting diodes of the blue spectral range is developed. The peak external quantum efficiency of light-emitting diodes with a p-contact based on the obtained films reaches 25%, while for similar light-emitting diodes with a standard semitransparent metal contact, it is <10%. An observed increase in the direct voltage drop from 3.15 to 3.37 V does not significantly affect the possibility of applying these films in light-emitting diodes since the optical power of light-emitting diodes with a transparent p-contact based on ITO films exceeds that of chips with metal semitransparent p-contacts with a working current of 20 mA by a factor of almost 2.5. Light-emitting diodes with p-contacts based on ITO films successfully withstand a pumping current that exceeds their calculated working current by a factor of 5 without the appearance of any signs of degradation.

Smirnova, I. P., E-mail: irina@quantum.ioffe.ru; Markov, L. K.; Pavlyuchenko, A. S. [Russian Academy of Sciences, Ioffe Physical Technical Institute (Russian Federation); Kukushkin, M. V. [ZAO Innovation Company 'TETIS' (Russian Federation)

2012-03-15T23:59:59.000Z

467

Tunnel-injection GaN quantum dot ultraviolet light-emitting diodes  

SciTech Connect

We demonstrate a GaN quantum dot ultraviolet light-emitting diode that uses tunnel injection of carriers through AlN barriers into the active region. The quantum dot heterostructure is grown by molecular beam epitaxy on AlN templates. The large lattice mismatch between GaN and AlN favors the formation of GaN quantum dots in the Stranski-Krastanov growth mode. Carrier injection by tunneling can mitigate losses incurred in hot-carrier injection in light emitting heterostructures. To achieve tunnel injection, relatively low composition AlGaN is used for n- and p-type layers to simultaneously take advantage of effective band alignment and efficient doping. The small height of the quantum dots results in short-wavelength emission and are simultaneously an effective tool to fight the reduction of oscillator strength from quantum-confined Stark effect due to polarization fields. The strong quantum confinement results in room-temperature electroluminescence peaks at 261 and 340 nm, well above the 365 nm bandgap of bulk GaN. The demonstration opens the doorway to exploit many varied features of quantum dot physics to realize high-efficiency short-wavelength light sources.

Verma, Jai; Kandaswamy, Prem Kumar; Protasenko, Vladimir; Verma, Amit; Grace Xing, Huili; Jena, Debdeep [Department of Electrical Engineering, University of Notre Dame, Indiana 46556 (United States)] [Department of Electrical Engineering, University of Notre Dame, Indiana 46556 (United States)

2013-01-28T23:59:59.000Z

468

Top 8 Things You Didn't Know About LEDs | Department of Energy  

NLE Websites -- All DOE Office Websites (Extended Search)

You Didn't Know About..." Be sure to check back for more entries soon. 8. A light-emitting diode, or LED, is a type of solid-state lighting that uses a semiconductor to convert...

469

Manipulating Lasers A laser is a very special kind of light. For example, light from a laser is emitted in only one  

E-Print Network (OSTI)

Manipulating Lasers A laser is a very special kind of light. For example, light from a laser is emitted in only one direction, in contrast to other sources, such as incandescent bulbs, in which different directions occur. Lasers can contain one or different colors combined, like sun light. It can even

Dantus, Marcos

470

Manganese-doped indium oxide and its application in organic light-emitting diodes  

SciTech Connect

Thin films of manganese-doped indium oxide (IMO) deposited by electron beam evaporation have been investigated as anodes in organic light-emitting diodes (OLEDs). The IMO films have a high work function of 5.35 eV, a desirable surface morphology with an average roughness of 1.1 nm, a high average optical transmittance of 87.2% in the visible region, and a maximum optical transmittance of 92% at 460 nm. It is demonstrated that an IMO anode can effectively improve hole injection at the anode/organic interface, resulting in OLEDs with an increased electroluminescent efficiency.

Liao Yaqin [Key Laboratory of Excited State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033 (China); Graduate School of Chinese Academy of Sciences, Beijing 100080 (China); Lu Qipeng; Fan Yi; Liu Xingyuan [Key Laboratory of Excited State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033 (China)

2011-07-11T23:59:59.000Z

471

Process development for the fabrication of light emitting vacuum field emission triodes  

E-Print Network (OSTI)

In order to be widely accepted by industry, the field of vacuum microelectronics is in need of a highly manufacturable and integrable device. A vacuum diode meeting these requirements has been developed at Texas A&M University by Weichold, et al. Legg has extended the diode structure by designing a vacuum triode. This work deals with development of a process for fabricating the triode structure using current microelectronic processing techniques. Subsequently, triodes are fabricated for testing. Light emitting diodes and triodes are also fabricated to address the feasibility of their application to flat panel displays.

Williams, Roger T.

1994-01-01T23:59:59.000Z

472

Hybrid Infrared and Visible Light Projection for Location Tracking  

E-Print Network (OSTI)

-output light emitting diodes. Figure 5. Inside our projector: A) LED light source B) culminating lens C) DMD for application content. In [4], Nii et al. created an infrared projector prototype using discrete light emitting diodes (LEDs). The projection lens focused directly onto the LED array creating a low resolution infrared

Olsen Jr., Dan R.

473

Organic Light-Emitting Diodes (OLEDs) and Optically-Detected Magnetic Resonance (ODMR) studies on organic materials  

Science Conference Proceedings (OSTI)

Organic semiconductors have evolved rapidly over the last decades and currently are considered as the next-generation technology for many applications, such as organic light-emitting diodes (OLEDs) in flat-panel displays (FPDs) and solid state lighting (SSL), and organic solar cells (OSCs) in clean renewable energy. This dissertation focuses mainly on OLEDs. Although the commercialization of the OLED technology in FPDs is growing and appears to be just around the corner for SSL, there are still several key issues that need to be addressed: (1) the cost of OLEDs is very high, largely due to the costly current manufacturing process; (2) the efficiency of OLEDs needs to be improved. This is vital to the success of OLEDs in the FPD and SSL industries; (3) the lifetime of OLEDs, especially blue OLEDs, is the biggest technical challenge. All these issues raise the demand for new organic materials, new device structures, and continued lower-cost fabrication methods. In an attempt to address these issues, we used solution-processing methods to fabricate highly efficient small molecule OLEDs (SMOLEDs); this approach is costeffective in comparison to the more common thermal vacuum evaporation. We also successfully made efficient indium tin oxide (ITO)-free SMOLEDs to further improve the efficiency of the OLEDs. We employed the spin-dependent optically-detected magnetic resonance (ODMR) technique to study the luminescence quenching processes in OLEDs and organic materials in order to understand the intrinsic degradation mechanisms. We also fabricated polymer LEDs (PLEDs) based on a new electron-accepting blue-emitting polymer and studied the effect of molecular weight on the efficiency of PLEDs. All these studies helped us to better understand the underlying relationship between the organic semiconductor materials and the OLEDs’ performance, and will subsequently assist in further enhancing the efficiency of OLEDs. With strongly improved device performance (in addition to other OLEDs' attributes such as mechanical flexibility and potential low cost), the OLED technology is promising to successfully compete with current technologies, such as LCDs and inorganic LEDs.

Cai, Min

2011-11-30T23:59:59.000Z

474

Detection of Single Molecules Illuminated by a Light-Emitting Diode  

E-Print Network (OSTI)

Optical detection and spectroscopy of single molecules has become an indispensable tool in biological imaging and sensing. Its success is based on fluorescence of organic dye molecules under carefully engineered laser illumination. In this paper we demonstrate optical detection of single molecules on a wide-field microscope with an illumination based on a commercially available, green light-emitting diode. The results are directly compared with laser illumination in the same experimental configuration. The setup and the limiting factors, such as light transfer to the sample, spectral filtering and the resulting signal-to-noise ratio are discussed. A theoretical and an experimental approach to estimate these parameters are presented. The results can be adapted to other single emitter and illumination schemes.

Ilja Gerhardt; Lijian Mai; Antia Lamas-Linares; Christian Kurtsiefer

2011-01-14T23:59:59.000Z

475

PHYSICS 359 THE SPEED OF LIGHT  

E-Print Network (OSTI)

in this experiment using a high speed light emitting diode (LED) modulated at 40 MHz as the source, and a PIN

Landstreet, John D.

476

Light extraction in individual GaN nanowires on Si for LEDs  

E-Print Network (OSTI)

GaN-based nanowires hold great promise for solid state lighting applications because of their waveguiding properties and the ability to grow nonpolar GaN nanowire-based heterostructures, which could lead to increased light ...

Zhou, Xiang

477

Low Power, Red, Green and Blue Carbon Nanotube Enabled Vertical Organic Light Emitting Transistors for Active Matrix OLED Displays  

SciTech Connect

Organic semiconductors are potential alternatives to polycrystalline silicon as the semiconductor used in the backplane of active matrix organic light emitting diode displays. Demonstrated here is a light-emitting transistor with an organic channel, operating with low power dissipation at low voltage, and high aperture ratio, in three colors: red, green and blue. The single-wall carbon nanotube network source electrode is responsible for the high level of performance demonstrated. A major benefit enabled by this architecture is the integration of the drive transistor, storage capacitor and light emitter into a single device. Performance comparable to commercialized polycrystalline-silicon TFT driven OLEDs is demonstrated.

McCarthy, M. A. [University of Florida, Gainesville; Liu, B. [University of Florida, Gainesville; Donoghue, E. P. [University of Florida, Gainesville; Kravchenko, Ivan I [ORNL; Kim, D. Y. [University of Florida, Gainesville; So, Franky [University of Florida, Gainesville; Rinzler, A. G. [University of Florida, Gainesville

2011-01-01T23:59:59.000Z

478

Analysis of the causes of the decrease in the electroluminescence efficiency of AlGaInN light-emitting-diode heterostructures at high pumping density  

SciTech Connect

The study is devoted to theoretical explanation of a decrease in the electroluminescence efficiency as the pump current increases, which is characteristic of light-emitting-diode (LED) heterostructures based on AlInGaN. Numerical simulation shows that the increase in the external quantum efficiency at low current densities J {approx} 1 A/cm{sup 2} is caused by the competition between radiative and nonradiative recombination. The decrease in the quantum efficiency at current densities J > 1 A/cm{sup 2} is caused by a decrease in the efficiency of hole injection into the active region. It is shown that the depth of the acceptor energy level in the AlGaN emitter, as well as low electron and hole mobilities in the p-type region, plays an important role in this effect. A modified LED heterostructure is suggested in which the efficiency decrease with the pump current should not occur.

Rozhansky, I. V., E-mail: igor@quantum.ioffe.ru; Zakheim, D. A. [Russian Academy of Sciences, Ioffe Physicotechnical Institute (Russian Federation)

2006-07-15T23:59:59.000Z

479

High Performance Green LEDs by Homoepitaxial  

SciTech Connect

This work's objective was the development of processes to double or triple the light output power from green and deep green (525 - 555 nm) AlGaInN light emitting diode (LED) dies within 3 years in reference to the Lumileds Luxeon II. The project paid particular effort to all aspects of the internal generation efficiency of light. LEDs in this spectral region show the highest potential for significant performance boosts and enable the realization of phosphor-free white LEDs comprised by red-green-blue LED modules. Such modules will perform at and outperform the efficacy target projections for white-light LED systems in the Department of Energy's accelerated roadmap of the SSL initiative.

Wetzel, Christian; Schubert, E Fred

2009-11-22T23:59:59.000Z

480

Study: Environmental Benefits of LEDs Greater Than CFLs | Department of  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Study: Environmental Benefits of LEDs Greater Than CFLs Study: Environmental Benefits of LEDs Greater Than CFLs Study: Environmental Benefits of LEDs Greater Than CFLs December 9, 2013 - 4:13pm Addthis A three-part Energy Department-funded study indicates LEDs are more environmentally friendly than compact fluorescent and incandescent lights. | Energy Department graphic A three-part Energy Department-funded study indicates LEDs are more environmentally friendly than compact fluorescent and incandescent lights. | Energy Department graphic Jim Brodrick Lighting Program Manager MORE RESOURCES Find out how LED lighting works Get project planning and analysis tools Subscribe to Solid-State Lighting's email distribution list Increasingly, light emitting diode (LED) screw-based lamps are providing consumers a cost-effective and energy efficient alternative to compact

Note: This page contains sample records for the topic "led light emitting" from the National Library of EnergyBeta (NLEBeta).
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they are not comprehensive nor are they the most current set.
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481

Study: Environmental Benefits of LEDs Greater Than CFLs | Department of  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Study: Environmental Benefits of LEDs Greater Than CFLs Study: Environmental Benefits of LEDs Greater Than CFLs Study: Environmental Benefits of LEDs Greater Than CFLs December 9, 2013 - 4:13pm Addthis A three-part Energy Department-funded study indicates LEDs are more environmentally friendly than compact fluorescent and incandescent lights. | Energy Department graphic A three-part Energy Department-funded study indicates LEDs are more environmentally friendly than compact fluorescent and incandescent lights. | Energy Department graphic Jim Brodrick Lighting Program Manager MORE RESOURCES Find out how LED lighting works Get project planning and analysis tools Subscribe to Solid-State Lighting's email distribution list Increasingly, light emitting diode (LED) screw-based lamps are providing consumers a cost-effective and energy efficient alternative to compact

482

Multicolor, High Efficiency, Nanotextured LEDs  

SciTech Connect

We report on research results in this project which synergize advanced material science approaches with fundamental optical physics concepts pertaining to light-matter interaction, with the goal of solving seminal problems for the development of very high performance light emitting diodes (LEDs) in the blue and green for Solid State Lighting applications. Accomplishments in the duration of the contract period include (i) heteroepitaxy of nitrogen-polar LEDs on sapphire, (ii) heteroepitaxy of semipolar (11{bar 2}2) green LEDs on sapphire, (iii) synthesis of quantum-dot loaded nanoporous GaN that emits white light without phosphor conversion, (iv) demonstration of the highest quality semipolar (11{bar 2}2) GaN on sapphire using orientation-controlled epitaxy, (v) synthesis of nanoscale GaN and InGaN medium, and (vi) development of a novel liftoff process for manufacturing GaN thin-film vertical LEDs. The body of results is presented in this report shows how a solid foundation has been laid, with several noticeable accomplishments, for innovative research, consistent with the stated milestones.

Jung Han; Arto Nurmikko

2011-09-30T23:59:59.000Z

483

Green route synthesis of high quality CdSe quantum dots for applications in light emitting devices  

SciTech Connect

Investigation was made on light emitting diodes fabricated using CdSe quantum dots. CdSe quantum dots were synthesized chemically using olive oil as the capping agent, instead of toxic phosphine. Room temperature photoluminescence investigation showed sharp 1st excitonic emission peak at 568 nm. Bi-layer organic/inorganic (P3HT/CdSe) hybrid light emitting devices were fabricated by solution process. The electroluminescence study showed low turn on voltage ({approx}2.2 V) .The EL peak intensity was found to increase by increasing the operating current. - Graphical abstract: Light emitting diode was fabricated using CdSe quantum dots using olive oil as the capping agent, instead of toxic phosphine. Bi-layer organic/inorganic (P3HT/CdSe) hybrid light emitting device shows strong electroluminescence in the range 630-661 nm. Highlights: Black-Right-Pointing-Pointer CdSe Quantum dots were synthesized using olive oil as the capping agent. Black-Right-Pointing-Pointer Light emitting device was fabricated using CdSe QDs/P3HT polymer heterojunction. Black-Right-Pointing-Pointer The I-V characteristics study showed low turn on voltage at {approx}2.2 V. Black-Right-Pointing-Pointer The EL peak intensity increases with increasing the operating current.

Bera, Susnata, E-mail: susnata.bera@gmail.com [Department of Physics and Meteorology, Indian Institute of Technology Kharagpur, Kharagpur 721302 (India); Singh, Shashi B. [Department of Physics and Meteorology, Indian Institute of Technology Kharagpur, Kharagpur 721302 (India); Ray, S.K., E-mail: physkr@phy.iitkgp.ernet.in [Department of Physics and Meteorology, Indian Institute of Technology Kharagpur, Kharagpur 721302 (India)

2012-05-15T23:59:59.000Z

484

AlxIn1-xP Amber LEDs for Solid-State Lighting  

Switching to solid-state lamps is forecast to result in a 46% reduction in lighting energy consumption by 2030. •Cumulative energy savings 2010-2030: ...

485

Smart Lighting ERC Industrial Speaker Series  

E-Print Network (OSTI)

Flexible LEDs bring light to fingertips Oct 19, 2010 Glowing gloves Light-emitting diodes ­ or LEDs ­ have already found their way into traffic lights, TV screens and incredibly efficient light bulbs and colleagues have exploited a new printing technique for forming arrays of incredibly small red LEDs

LĂĽ, James Jian-Qiang

486

IEEE Transactions on Consumer Electronics Visible Light Communication for Audio Systems  

E-Print Network (OSTI)

to be constantly illuminated. Keywords: audio systems, light emitting diodes; audio broadcasting. 1. Introduction. Conclusions An audio system made up of light emitting diode (LED) and LED dot matrix display is described.G. Craford, "High Brightness Light Emitting Diodes", Semiconductors and Semimetals Vol. 48, Academic Press

Pang, Grantham

487

2002 Archived Selected Headlines of Solid-State Lighting Headlines...  

NLE Websites -- All DOE Office Websites (Extended Search)

has applied for WIPO protection for a garnet phosphor for converting UV and blue LED light to white light. A device incorporating a UV LED and the garnet phosphor emits at 490...

488

When to Turn Off Your Lights | Department of Energy  

NLE Websites -- All DOE Office Websites (Extended Search)

are not already factored into the rate. LED Lighting The operating life of a light emitting diode (LED) is unaffected by turning it on and off. While lifetime is reduced for...

489

Highly efficient blue organic light emitting devices with indium-free transparent anode on flexible substrates  

Science Conference Proceedings (OSTI)

Indium-free transparent conducting oxides may provide a lower cost solution for the transparent anode in flexible displays and energy efficient solid state lighting. We report herein a near room temperature sputtering process for generating an indium-free transparent conductive oxide (TCO) coating on a flexible substrate. Specifically, we deposited gallium-doped zinc oxide (GZO) uniformly over a 12” diameter area at room temperature on polyethylene terephthalate (PET). During deposition, the system heats to about 60oC due to the energetic sputtering conditions, without any noticeable damage to the PET substrate. The GZO films exhibit excellent physical, optical and electrical properties: roughness ~7 nm, transmittance >85% and resistivity ~ 10-3 ohm• cm. Phosphorescent blue organic light-emitting devices (OLEDs) were fabricated on these substrates with comparable performance (16% external quantum efficiency and 33 lm/W power efficiency at 1mA/cm2) to that of devices fabricated on GZO (or ITO) deposited on glass substrates, suggesting flexible GZO/PET substrates may be used instead of high-cost and rigid ITO and glass for flexible displays and solid state lighting.

Wang, Liang; Swensen, James S.; Polikarpov, Evgueni; Matson, Dean W.; Bonham, Charles C.; Bennett, Wendy D.; Gaspar, Daniel J.; Padmaperuma, Asanga B.

2010-09-30T23:59:59.000Z