青色
荧光粉
热稳定性
材料科学
激活剂(遗传学)
离子
二极管
可见光谱
发光二极管
化学
光电子学
发射光谱
发光
分析化学(期刊)
光学
谱线
物理
天文
基因
生物化学
有机化学
色谱法
作者
Quansheng Wu,Chen Shi,Jiang Zhou,Yuxin Gao,Yi-Ting Huang,Jianyan Ding,Quansheng Wu
标识
DOI:10.1016/j.cej.2021.133062
摘要
Tuning the luminescent properties of phosphors by crystal-site engineering is a good and efficient strategy for developing high-quality white light-emitting diodes (WLEDs). However, it is still challenging to modulate the cyan to red spectral emission in a single matrix and activator phosphor to obtain multicolor output and achieve full-visible-spectrum lighting. Herein, the strategy to manipulate site-selective occupation of Eu2+ activators by substituting the cation Rb+ with K+ is reported to obtain a versatile color output. The large-scale redshift regulation of emission spectrum from cyan to red was achieved in fluor-phosphate Rb2-yKyCaPO4F: 0.0085Eu2+ (R2-yKyCPOF: 0.0085Eu2+) (0 ≤ y ≤ 1.8) phosphors, which is designed by using Rb2CaPO4F: 0.0085Eu2+ (RCPOF: 0.0085Eu2+) cyan-emitting phosphor. The redistribution of Eu2+ ions in Rb1, Rb2, and Ca sites is achieved by introducing the cation K+ to substitute Rb+, and R2-yKyCPOF: 0.0085Eu2+ (0 ≤ y ≤ 1.8) is kept in the pure phase. Furthermore, the mixed phosphors of RCPOF: 0.0085Eu2+, RKCPOF: 0.0085Eu2+, and R0.2K1.8CPOF: 0.0085Eu2+ show excellent optical performance and good thermal stability. Full-visible spectrum lighting is successfully achieved with the combination of a 395 nm NUV chip and the blend of phosphor-converted WLEDs. The K+ substitution reported in this paper can support a project for warm WLEDs by manipulating the distribution of Eu2+ activator among different cation sites.
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