High-temperature (350°C) glass phosphor layer for converted white light-emitting diodes

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

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

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.

Original languageEnglish
Title of host publicationTwelfth International Conference on Solid State Lighting and Fourth International Conference on White LEDs and Solid State Lighting
DOIs
StatePublished - 2012
Event12th International Conference on Solid State Lighting and 4th International Conference on White LEDs and Solid State Lighting - San Diego, CA, United States
Duration: 13 Aug 201216 Aug 2012

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8484
ISSN (Print)0277-786X

Conference

Conference12th International Conference on Solid State Lighting and 4th International Conference on White LEDs and Solid State Lighting
Country/TerritoryUnited States
CitySan Diego, CA
Period13/08/1216/08/12

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