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Proceedings Paper

High-temperature (350°C) glass phosphor layer for converted white light-emitting diodes
Author(s): Wood-Hi Cheng; Chun-Chin Tsai; Wei-Chih Cheng; Jin-Kai Chang; Ji-Hung Chen; Si-Sheng Hu; Li-Yin Chen; Min-Ching Lin; Ching-Jen Pan
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Paper Abstract

The high-temperature operation up to 350°C of glass phosphor layer for using in converted white light-emitting diodes is demonstrated. The results showed that the phosphor-converted white light-emitting diode (PC-WLEDs) maintained good thermal stability in lumen, chromaticity, and transmittance characteristics at the high temperature up to 350°C. The lumen degradation, chromaticity shift, and transmittance loss in glass based high-power PC-WLEDs under thermal aging at 150, 250, 350, and 450°C are presented and compared with the silicone based high-power PC-WLEDs under thermal aging at 150 and 250°C. The result clearly indicated that the glass based PC-WLEDs exhibited better thermal stability in lumen degradation, chromaticity shift, and transmittance loss than the silicone based PC-WLEDs. The advantages of glass doped encapsulation in high temperature PC-WLEDs could be arisen from the material property of glass transition temperature 567°C higher than silicone of 150°C. These newly developed high-temperature glass based PC-WLEDs are essentially critical to the application of LED modules in the area where the high-power, high-temperature, and absolute reliability are required for use in the next-generation solid-state lighting.

Paper Details

Date Published: 15 October 2012
PDF: 10 pages
Proc. SPIE 8484, Twelfth International Conference on Solid State Lighting and Fourth International Conference on White LEDs and Solid State Lighting, 848409 (15 October 2012); doi: 10.1117/12.928321
Show Author Affiliations
Wood-Hi Cheng, National Sun Yat-Sen Univ. (Taiwan)
Chun-Chin Tsai, Far East Univ. (Taiwan)
Wei-Chih Cheng, National Sun Yat-Sen Univ. (Taiwan)
Jin-Kai Chang, National Sun Yat-Sen Univ. (Taiwan)
Ji-Hung Chen, National Sun Yat-Sen Univ. (Taiwan)
Si-Sheng Hu, National Sun Yat-Sen Univ. (Taiwan)
Li-Yin Chen, National Sun Yat-Sen Univ. (Taiwan)
Min-Ching Lin, Walsin Lihwa (Taiwan)
Ching-Jen Pan, HELIO Optoelectronics Corp. (Taiwan)


Published in SPIE Proceedings Vol. 8484:
Twelfth International Conference on Solid State Lighting and Fourth International Conference on White LEDs and Solid State Lighting
Matthew H. Kane; Christian Wetzel; Jian-Jang Huang; Ian T. Ferguson, Editor(s)

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