荧光粉
热稳定性
兴奋剂
材料科学
显色指数
发光二极管
分析化学(期刊)
光电子学
化学
有机化学
作者
N. S. M. Viswanath,G. Krishnamurthy Grandhi,Ha Tran Huu,Hyuk Soon Choi,Ha Jun Kim,Sang Woo Kim,Hyun You Kim,Chan‐Jin Park,Won Bin Im
标识
DOI:10.1016/j.cej.2020.127664
摘要
Europium-doped UCr4C4 cuboid phosphors with narrow and tunable emission show promise for application in designing light-emitting diodes with high color purity and thermal stability. Nevertheless, their poor chemical stability bottlenecks their use in lighting applications. Herein, a dual narrow-band blue-emitting Ce3+-doped CsNa2K(Li3SiO4)4 (CNKLSO) cuboid phosphor with a quantum yield of 80% is synthesized. The dual-band emission is attributed to the occupation of Ce3+ at two distinct sites of CNKLSO, which is consistent with the density functional theory outcomes. Ce3+ doping produces stable emission characteristics, in contrast to Eu2+ incorporation, because of the improved site stability, as realized from bond valence sum calculations. Remarkably, no drop in the emission intensity is observed even at 200 °C, making CNKLSO:Ce3+ the first Ce3+-based zero-thermal-quenching phosphor. A CNKLSO:Ce3+-based white light-emitting diode displays an excellent color rendering index (~95) at a high flux current of 1000 mA. The proposed study indicates that Ce3+ doping in other UCr4C4- type oxide phosphors may improve the site stability, which in turn the chemical stability of the phosphor materials can be boosted.
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