Novel broadband glass phosphors for high CRI WLEDs

Li Yin Chen, Wei Chih Cheng, Chun Chin Tsai, Jin Kai Chang, Yi Chung Huang, Jhih Ci Huang, Wood Hi Cheng

Research output: Contribution to journalArticlepeer-review

71 Scopus citations

Abstract

New broadband glass phosphors with excellent thermal stability were proposed and experimentally demonstrated for white light-emittingdiodes (WLEDs). The novel glass phosphors were realized through dispersing multiple phosphors into SiO2 based glass (SiO2-Na2O-Al2O3- CaO) at 680°C. Y3Al5O12:Ce3+ (YAG), Lu3Al5O12:Ce3+ (LuAG), and CaAlSiN3: Eu2+ (nitride) phosphor crystals were chosen respectively as the yellow, green, and red emitters of the glass phosphors. The effect of sintering temperature on inter-diffusion reduction between phosphor crystals and amorphous SiO2 in nitride-doped glass phosphors was studied and evidenced by the aid of high-resolution transmission electron microscopy (HRTEM). Broadband glass phosphors with high quantumyield of 55.6% were thus successfully realized through the implementation of low sintering temperature. Proof-of-concept devices utilizing the novel broadband phosphors were developed to generate high-quality cool-white light with trisstimulus coordinates (x, y) = (0.358, 0.288), color-rending index (CRI) = 85, and correlated color temperature (CCT) = 3923K. The novel broadband glass phosphors with excellent thermal stability are 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
Pages (from-to)A671-A678
JournalOptics Express
Volume22
Issue numberSUPPL. 3
DOIs
StatePublished - 2014

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