Efficiency enhancement in white phosphor-on-cup light-emitting diodes using short wave-pass filters

Sang-Hwan Cho; Jeong Rok Oh; Yong-Hee Lee; Young Rag Do

doi:10.1117/12.843034

11 February 2010 Efficiency enhancement in white phosphor-on-cup light-emitting diodes using short wave-pass filters

Sang-Hwan Cho, Jeong Rok Oh, Yong-Hee Lee, Young Rag Do

Proceedings Volume 7617, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XIV; 76171R (2010) https://doi.org/10.1117/12.843034
Event: SPIE OPTO, 2010, San Francisco, California, United States

Abstract

We proposed and demonstrated a simple approach for designing and developing blue-excitation-light passing and phosphor-yellow-emission-light reflecting dielectric multilayer to enhance the forward efficiency of Y₃Al₅O₁₂:Ce³⁺ (YAG:Ce) yellow phosphor on top of a blue InGaN LED cup. When inserting a modified quarter-wave films of alternate high- and low-refractive index dielectric films (TiO₂/SiO₂) into the interface between a YAG:Ce phosphor layer and a glass substrate, enhancements of the efficiency and luminous efficacy of the forward white emission become 1.64 and 1.95 times that of a conventional phosphor on top of a blue LED cup with a lower correlated color temperature (< 4000K).

Citation Download Citation

Sang-Hwan Cho, Jeong Rok Oh, Yong-Hee Lee, and Young Rag Do "Efficiency enhancement in white phosphor-on-cup light-emitting diodes using short wave-pass filters", Proc. SPIE 7617, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XIV, 76171R (11 February 2010); https://doi.org/10.1117/12.843034

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