荧光粉
热稳定性
兴奋剂
材料科学
热释光
量子产额
光电子学
量子效率
X射线光电子能谱
磷光
分析化学(期刊)
紫外线
显色指数
发光
化学
化学工程
光学
荧光
物理
有机化学
工程类
作者
Shuai Wei,Zeyu Lyu,Zheng Lu,Ping Luo,Liqiang Zhou,DeGui Sun,Taixing Tan,Sida Shen,Hongpeng You
标识
DOI:10.1021/acs.chemmater.3c01411
摘要
Trap engineering is widely applied to contend with thermal quenching of phosphors. However, the incidental detriment of the luminescent efficiency has long been neglected. Herein, we propose a paradigm for achieving a high-performing Bi3+-doped phosphor with moderate trap engineering. Through introducing appropriate traps in a neutral atmosphere and proper doping concentration, we have successfully created a novel Ba2GdAlO5:Bi3+ yellow phosphor that exhibits exceptional thermal stability (104.1%@423 K) and a high internal quantum yield (82.78%), which is the top performance among Bi3+-doped phosphors. The oxygen vacancy and Bi2+ were identified as the responsible traps through X-ray photoelectron spectroscopy, while their depth was measured to be 0.9 eV by using thermoluminescence. Notably, the phosphor exhibited photochromism upon near-ultraviolet (n-UV) excitation and could be bleached through heat treatment. These observations highlight its potential for various applications. Finally, two white lighting devices with a color rendering index exceeding 90 were prepared with n-UV LED chips by applying Ba2GdAlO5:Bi3+ as one of the phosphors. This study not only provides a high-performance Bi3+-doped phosphor suitable for high-quality white LED (WLED) lighting but also proposes a methodology for designing phosphors with high efficiency and thermal stability..
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