Title: Phosphor-converted white light emitting diodes having narrow-band green phosphors

Abstract

In one aspect, a phosphor converted white light LED comprising a narrow green phosphor rather than a conventional broad green phosphor may simultaneously exhibit high R9, and high Luminance Efficacy of Radiation, optionally without use of a deep red phosphor to maintain desired red color rendering. In another aspect, a phosphor converted white light LED comprising a narrow green phosphor rather than a conventional broad green phosphor may provide an emission spectrum exhibiting a significant dip in the yellow region of the spectrum and thereby provide high red-green contrast without use of a filter. The yellow dip may be shallower than in conventional devices, and the device may therefore be brighter, while maintaining desired CRI and R9.

Inventors:

Melman, Jonathan; Nordsell, Robert; Baroudi, Kristen; Thomas, Evan; Go, Yong Bok

Issue Date:

2018-08-21

Research Org.:

EIE Materials, Inc., Lexington, KY (United States)

Sponsoring Org.:

USDOE

OSTI Identifier:

1470732

Patent Number(s):

10056530

Application Number:

15/679,021

Assignee:

EIE Materials, Inc. (Lexington, KY)

Patent Classifications (CPCs):

H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01L - SEMICONDUCTOR DEVICES

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H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01L - SEMICONDUCTOR DEVICES

H01L2933/0041 - relating to wavelength conversion elements
H01L2224/73265 - Layer and wire connectors
H01L33/502 - {Wavelength conversion materials}
H01L33/50 - Wavelength conversion elements
H01L33/504 - {Elements with two or more wavelength conversion materials}

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DOE Contract Number:  

EE0007622

Resource Type:

Patent

Resource Relation:

Patent File Date: 2017 Aug 16

Country of Publication:

United States

Language:

English

Subject:

36 MATERIALS SCIENCE