Synthesis and luminescent properties of BaGd_2O_4:Eu^(3+) phosphors with highly efficient red-emitting

作     者：Yue Li Jinkai Li Zongming Liu Weilin Zhao 

作者机构：School of Materials Science and Engineering University of Jinan 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2018年第36卷第8期

页      面：795-801页

核心收录：

学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 

基　　金：Project supported by the National Natural Science Foundation of China(51402125) China Postdoctoral Science Foundation(2017M612175) the Special Fund for the Postdoctoral Innovation Project in Shandong Province(201603061) the Research Fund for the Doctoral Program of University of Jinan(XBS1447) the Natural Science Foundation of University of Jinan(XKY1515) the Science Foundation for Post Doctorate Research from the University of Jinan(XBH1607) 

主　　题：BaGd2O4 host Eu^3+ doped Sol-gel method Luminescent properties Rare earths 

摘      要：The BaGd（2-2 x）Eu（2 x）O4（BG, x = 0.01-0.09） phosphors were successfully synthesized via the sol-gel method,and BaY（2-2 y）Eu（2 y）O4（BY, y = 0.005-0.07） phosphors were included for comparison. The pure phase BG phosphors with the ordered CaFe2 O4-type structure are obtained by annealing at 1300℃ for5 h. The phosphors with uniform particle size of 120 nm and good dispersion display typical Eu^3＋emission with the strongest peak at 613 nm（^5 D0→^7 F2 transition of Eu3＋） under optimal excitation band at 262 nm（CTB band）. The presence of Gd^3＋ excitation bands on the PLE spectra monitoring the Eu3＋emission directly proves an evidence of Gd^3＋-Eu^3＋ energy transfer. Owing to the concentration quenching, the optimum content of Eu3＋ addition is 5 at%（x = 0.05）, and the quenching mechanism is determined to be the exchange reaction between Eu3＋. All the BG samples have similar color coordinates and temperature of（0.64 ± 0.02, 0.36 ± 0.01） and 2000 ± 100 K,respectively. The lifetime value of BaGd（1.9）Eu（0.1）O4 for 613 nm is fitted to be 2.19 ± 0.01 ms, and the Eu^3＋ concentration does not change the lifetime significantly. Owing to the Gd^3＋-Eu^3＋ energy transfer, the luminescent intensity of the BaGd（1.9）Eu（0.1）O4 phosphor is better than BY system. The BG system served as a new type of phosphor is expected to be widely used in lighting and display areas.