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Proceedings Paper

Efficiency enhancement in white phosphor-on-cup light-emitting diodes using short wave-pass filters
Author(s): Sang-Hwan Cho; Jeong Rok Oh; Yong-Hee Lee; Young Rag Do
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Paper 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).

Paper Details

Date Published: 12 February 2010
PDF: 9 pages
Proc. SPIE 7617, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XIV, 76171R (12 February 2010); doi: 10.1117/12.843034
Show Author Affiliations
Sang-Hwan Cho, Korea Advanced Institute of Science and Technology (Korea, Republic of)
Jeong Rok Oh, Kookmin Univ. (Korea, Republic of)
Yong-Hee Lee, Korea Advanced Institute of Science and Technology (Korea, Republic of)
Young Rag Do, Kookmin Univ. (Korea, Republic of)


Published in SPIE Proceedings Vol. 7617:
Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XIV
Klaus P. Streubel; Heonsu Jeon; Li-Wei Tu; Norbert Linder, Editor(s)

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