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Proceedings Paper

Phosphor chessboard packaging for white LEDs in high efficiency and high color performance
Author(s): Quang-Khoi Nguyen; Yu-Yu Chang; Chun-Yan Lu; Tsung-Hsun Yang; Te-Yuan Chung; Ching-Cherng Sun
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Paper Abstract

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.

Paper Details

Date Published: 7 September 2016
PDF: 9 pages
Proc. SPIE 9954, Fifteenth International Conference on Solid State Lighting and LED-based Illumination Systems, 995404 (7 September 2016); doi: 10.1117/12.2237255
Show Author Affiliations
Quang-Khoi Nguyen, National Central Univ. (Taiwan)
Yu-Yu Chang, National Central Univ. (Taiwan)
Chun-Yan Lu, National Central Univ. (Taiwan)
Tsung-Hsun Yang, National Central Univ. (Taiwan)
Te-Yuan Chung, National Central Univ. (Taiwan)
Ching-Cherng Sun, National Central Univ. (Taiwan)

Published in SPIE Proceedings Vol. 9954:
Fifteenth International Conference on Solid State Lighting and LED-based Illumination Systems
Matthew H. Kane; Nikolaus Dietz; Ian T. Ferguson, Editor(s)

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