Performance of Spherical Quantum Well Down Converters in Solid State Lighting

Rreza, Iva; Yang, Haoran; Hamachi, Leslie; Campos, Michael; Hull, Trevor; Treadway, Joseph; Kurtin, Juanita; Chan, Emory M.; Owen, Jonathan S.

doi:10.1021/acsami.0c15161

Performance of Spherical Quantum Well Down Converters in Solid State Lighting

Journal Article · Sun Mar 07 23:00:00 EST 2021 · ACS Applied Materials and Interfaces

DOI:https://doi.org/10.1021/acsami.0c15161· OSTI ID:1841717

Rreza, Iva ^[1]; ^[2]; ^[3]; ^[1]; Hull, Trevor ^[1]; Treadway, Joseph ^[4]; Kurtin, Juanita ^[4]; ^[2]; ^[1]

Columbia Univ., New York, NY (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Columbia Univ., New York, NY (United States); California Polytechnic State Univ. (CalPoly), San Luis Obispo, CA (United States)
Pacific Light Technologies, Portland, OR (United States)

We report the color conversion performance of amber and red emitting quantum dots (QDs) on InGaN solid-state lighting (SSL) light emitting diode (LED) packages. Spherical quantum well (SQW) architectures (CdS/CdSe_1-xS_x/CdS) were prepared using a library of thio- and selenourea synthesis reagents and high throughput synthesis robotics. CdS/CdSe_1-xS_x QDs with narrow luminescence bands were coated with thick CdS shells (thickness = 1.6-7.5 nm) to achieve photoluminescence quantum yields (PLQY) up to 88% at amber and red emission wavelengths (λ_max = 600-642 nm, FWHM < 45 nm). The photoluminescence from SQWs encapsulated in silicone and deposited on LED packages was monitored under accelerated aging conditions (oven temperature = 85 °C, relative humidity = 5-85%, blue optical power density = 3-45 W/cm²) by monitoring the red photon output over several hundred hours of continuous operation. The growth of a ZnS shell on the SQW surface increases the stability under long-term operation but also reduces the PLQY, especially of SQWs with thick CdS shells. The results illustrate that the outer ZnS shell layer is key to optimizing the PLQY and the long-term stability of QDs during operation on SSL packages.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Energy Efficiency and Renewable Energy (EERE); National Science Foundation (NSF); US Army

Grant/Contract Number:: AC02-05CH11231; EE0007628

OSTI ID:: 1841717

Journal Information:: ACS Applied Materials and Interfaces, Journal Name: ACS Applied Materials and Interfaces Journal Issue: 10 Vol. 13; ISSN 1944-8244

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Performance of Spherical Quantum Well Down Converters in Solid State Lighting

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