From Event: SPIE Optical Engineering + Applications, 2016
We performed the simulation of white LEDs packaging with different chessboard structures of white light
converting phosphor layer covered on GaN die chip. Three different types of chessboard structures are called type 1,
type 2 and type 3, respectively. The result of investigation according to the phosphor thickness show the increasing
of thickness of phosphor layer are, the decreasing of output blue light power are. Meanwhile, the changes of yellow
light are neglect. Type 3 shows highest packaging efficiency of 74.3 % compares with packaging efficiency of type
2 and type 1 (72.5 % and 71.3 %, respectively). Type 3 also shows the most effect of forward light. Attention that
the type 3 chessboard structure gets packaging efficiency of 74.3 % at color temperature of daylight as well as high
saving of phosphor amount. The color temperatures of three types of chessboard structure are higher than 5000 K, so
they are suitable for lighting purpose. The angular correlate color temperature deviation (ACCTD) of type 1, type 2
and type 3 are 6500K, 11500K and 17000K, respectively.
Quang-Khoi Nguyen, Yu-Yu Chang, Chun-Yan Lu, Tsung-Hsun Yang, Te-Yuan Chung, and Ching-Cherng Sun, "Phosphor chessboard packaging for white LEDs in high efficiency and high color performance," Proc. SPIE 9954, Fifteenth International Conference on Solid State Lighting and LED-based Illumination Systems, 995404 (Presented at SPIE Optical Engineering + Applications: August 31, 2016; Published: 7 September 2016); https://doi.org/10.1117/12.2237255.
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