Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China.
Department of Materials Science and Metallurgy, University of Cambridge, Cambridge CB3 0FS, UK.
Molecules. 2019 Apr 3;24(7):1296. doi: 10.3390/molecules24071296.
The development of white-light-emitting diodes (w-LEDs) makes it meaningful to develop novel high-performance phosphors excited by blue light. Herein, BiOCl:Pr green-yellow phosphors were prepared via a high-temperature solid-state reaction method. The crystal structure, luminescent properties, lifetime, thermal quenching behavior, and quantum yield were studied in detail. The BiOCl:Pr phosphors presented several emission peaks located in green and red regions, under excitation at 453 nm. The CIE coordinates could be tuned along with the changed doping concentration with fair luminescence efficiency. The results also indicated that the optimized doping concentration of Pr ions was at x = 0.0075 because of the concentration quenching behavior resulting from an intense exchange effect. When the temperature reached 150 °C, the intensity of the emission peak at 495 nm could remain at 78% of that at room temperature. The activation energy of 0.20 eV also confirmed that the BiOCl:Pr phosphor exhibited good thermal stability. All these results indicate that the prepared products have potential to be used as a high-performance green-yellow-light-emitting phosphor for blue-light-based w-LEDs.
白光发光二极管（w-LED）的发展使得开发新型高性能的蓝光激发荧光粉具有重要意义。本文通过高温固相反应法制备了 BiOCl:Pr 绿黄色荧光粉。详细研究了其晶体结构、发光性能、寿命、热猝灭行为和量子产率。在 453nm 激发下，BiOCl:Pr 荧光粉在绿光和红光区域呈现出多个发射峰。CIE 坐标可以通过改变掺杂浓度来调节，同时保持良好的发光效率。结果还表明，由于强烈的交换作用导致浓度猝灭现象，Pr 离子的最佳掺杂浓度为 x = 0.0075。当温度达到 150°C 时，495nm 发射峰的强度可以保持在室温下的 78%。0.20eV 的激活能也证实了 BiOCl:Pr 荧光粉具有良好的热稳定性。所有这些结果表明，所制备的产品有望用作基于蓝光的 w-LEDs 的高性能绿黄色发光荧光粉。
