荧光粉
材料科学
阳离子聚合
显色指数
量子效率
光电子学
发光
紫外线
离子
热稳定性
二极管
猝灭(荧光)
激发
光化学
分析化学(期刊)
荧光
光学
化学
物理
电气工程
有机化学
色谱法
高分子化学
工程类
作者
Yunjia Li,Shuzhen Liao,Dawei Wen,Changyan Ji,Shixun Lian,Jilin Zhang
标识
DOI:10.1016/j.ceramint.2023.11.109
摘要
Near-ultraviolet (n-UV) chip based phosphor-converted white light-emitting diode (pc-WLED) is proposed as one of the methods to realize full-spectral illumination with high color rendering index (CRI). Accordingly, it is crucial to explore n-UV excitable, efficient, and thermally stable phosphors. Here in, the redistribution of Eu2+ on different crystallographic sites (K and Ca) of K2CaPO4F was achieved by introducing Ce3+ and other optically inert rare earth (RE) ions (La3+, Y3+, and Lu3+). This cationic substitution resulted in the enhancement of blue emission, the weakening of red emission, and the appearance of white emission finally. The introduction of RE3+ not only improves the excitation at ∼400 nm, but also changes the quantum efficiency and thermal stability of the phosphors. For example, the introduction of Y3+ increases the external quantum efficiency from 52 % to 62 %. The introduction of Ce3+, Y3+, and Lu3+ brings traps and therefore results in anti-thermal quenching behavior within 398 K. The pc-WLEDs fabricated by covering a 365/380 nm chip with phosphor blend containing K2CaPO4F:Eu2+,RE3+ can emit a warm white light with a CRI as high as 98. This work provides an effective approach to tune the luminescence properties for high performance solid-state lighting.
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