Abstract

For illumination-grade applications, the spatial homogeneity of the white light emitted is an important issue which is directly associated with the geometry and the composition of the color conversion layer in phosphor-converted LEDs. In order to create a phosphor coating of high quality surrounding the LED chip surface, an improved slurry method with self-exposure technique was applied and investigated. The conformal phosphor layer of self-adaptability to angular intensity distribution of LED emitting light was realized. Plasma treatment was introduced to improve the aging performance of white LEDs with this advanced slurry method. The effect of the self-adaptive coating on the improvement of angular color uniformity of white LEDs was measured and discussed.

© 2013 IEEE

White thin-film flip-chip LEDs with uniform color temperature using laser lift-off and conformal phosphor coating technologies

Huan-Ting Lin, Ching-Ho Tien, Chen-Peng Hsu, and Ray-Hua Horng
Opt. Express 22(26) 31646-31653 (2014)

Cymbal-shaped phosphor structure for phosphor-converted white LEDs

Haibo Rao, Caineng Li, Qi Zhang, Chunyu Zhou, Wei Zhang, Kun Zhang, Da Zhou, Qiaolin Lei, and Xuemei Wang
Opt. Express 23(15) A949-A956 (2015)

Conformal phosphor coating using pulsed spray to reduce color deviation of white LEDs

Hsin-Tao Huang, Chuang-Chuang Tsai, and Yi-Pai Huang
Opt. Express 18(S2) A201-A206 (2010)

Conformal phosphor coating using capillary microchannel for controlling color deviation of phosphor-converted white light-emitting diodes

Huai Zheng, Xiaobing Luo, Run Hu, Bin Cao, Xing Fu, Yiman Wang, and Sheng Liu
Opt. Express 20(5) 5092-5098 (2012)

Color deviation controlling of phosphor conformal coating by advanced spray painting technology for white LEDs

Liang Yang, Simin Wang, Zhicheng Lv, and Sheng Liu
Appl. Opt. 52(10) 2075-2079 (2013)