Spectra and Packaging Performance of BaLaLiTeO6:Eu3+ Red-emitting Phosphors for White LEDs

被引：0
作者：
Ping Z.-Y. [1 ]
Zhao W. [1 ]
Zheng Q.-H. [1 ]
Zhou W.-W. [1 ]
机构：
[1] Anhui Key Laboratory of Low Temperature Co-fired Materials, Huainan Normal University, Huainan
来源：
Faguang Xuebao/Chinese Journal of Luminescence | 2019年 / 40卷 / 04期
关键词：
BaLaLiTeO[!sub]6[!/sub]:Eu[!sup]3+[!/sup; High-temperature solid-state reaction; Luminescence; Red-emitting phosphor for LED;
D O I：
10.3788/fgxb20194004.0432
中图分类号：
学科分类号：
摘要：
A series of BaLa1-xLiTeO6:xEu3+ (x=0.1-1) red-emitting phosphors were synthesized by high-temperature solid-state reaction at 1 100℃, and their structure, morphology, spectra and packaging performance were investigated systematically. The maximum doping content of Eu3+ was equal to the optimum one, i. e., x=0.4, beyond which impurities and concentration quenching were observed. The asymmetry ratio of I(5D0 →7F2)/I(5D0 →7F1) reached 7.31, resulting in high color purity of 99.7% with CIE 1931 chromaticity coordinates of (0.665, 0.334). The fluorescent lifetime and absolute quantum efficiency were measured to be 660.9 μs and 71.4%, respectively. The integrated emission intensity at 100℃ was as high as 84.5% of that at ambient temperature. The thermal activation energy was determined to be 0.434 eV. The prototypical LED based on it enabled to emit bright red light. In conclusion, the phosphor exhibits favorable luminous efficiency, color purity and thermal stability of luminescence, which have potential application in white LEDs. © 2019, Science Press. All right reserved.
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页码：432 / 439
页数：7
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