High-thermal-stability white light-emitting-diodes employing broadband glass phosphor

Wood Hi Cheng, Li Yin Chen, Wei Chih Cheng

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

3 Scopus citations

Abstract

We report the high-thermal-stability white light-emitting-diodes (WLEDs) employing broadband glass phosphors. The broadband glass phosphors were fabricated by sintering the mixture of multiple phosphors and SiO2-based glass (SiO2-Na2O-Al2O3-CaO) at 680?. Y3Al5O12:Ce3+ (YAG), Lu3Al5O12:Ce3+ (LuAG), and CaAlSiN3: Eu2+ (Nitride) phosphor crystals were chosen as the yellow, green, and red emitters of the glass phosphors, respectively. The results showed that the broadband phosphors exhibited high quantum-yield of 54% and color-rendering index (CRI) of 90. The lumen degradation, chromaticity shift, and transmittance loss in the broadband glass-based WLEDs under thermal aging temperature at 150, 250, 350 and 450? were also presented and compared with those of silicone-based WLEDs under thermal aging temperature at 150 and 250°C. The results demonstrated that the broadband glass-based WLEDs exhibited better thermal stability in lumen degradation, chromaticity shift, and transmittance loss than the silicone-based WLEDs. The excellent thermal stability of the broadband glass-based WLEDs with high CRI is essentially beneficial to the applications for next-generation solid-state indoor lighting, especially in the area where high power and absolute reliability are required.

Original languageEnglish
Title of host publicationThirteenth International Conference on Solid State Lighting
EditorsJianzhong Jiao, Matthew H. Kane, Nikolaus Dietz, Jian-Jang Huang
PublisherSPIE
ISBN (Electronic)9781628412178
DOIs
StatePublished - 2014
Event13th International Conference on Solid State Lighting - San Diego, United States
Duration: 20 Aug 201421 Aug 2014

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume9190
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

Conference13th International Conference on Solid State Lighting
CountryUnited States
CitySan Diego
Period20/08/1421/08/14

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