Conformal phosphor coating using pulsed spray to reduce color deviation of white LEDs.
This work presents a novel "pulsed spray (PS)" process for the coating of yellow YAG:Ce(3+) phosphor on blue InGaN-based light emitting diodes (LEDs). To coat a phosphor layer of high quality on an LED chip surface, the PS approach is used and studied because of the uniform color distribution, providing a wide range of color temperatures. This PS coating approach applies phosphor by exploiting mechanical principles without risk of chemical pollution. Additionally, it can be applied to wire-bonded LEDs and an array of LED chips on a substrate to fabricate a large-area, planar illumination system of high optical quality, which is easy to manufacture.
Huang
Hsin-Tao
HT
Department of Photonics and Institute of Electro-optical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan. stevenhuang.eo96g@nctu.edu.tw
Tsai
Chuang-Chuang
CC
Huang
Yi-Pai
YP