Mechanisms and absolute quantum yield of upconversion luminescence of fluoride phosphors

作     者：A. A. Lyapin S. V. Gushchin A. S. Ermakov S. V. Kuznetsov P. A. Ryabochkina V. Yu. Proydakova V. V. Voronov P. P. Fedorov M. V. Chernov 

作者机构：National Research Ogarev Mordovia State University Saransk 430005 Mordovia Russia Prokhorov General Physics Institute of the Russian Academy of Sciences Moscow 119991 Russia 

出 版 物：《Chinese Optics Letters》 (中国光学快报（英文版）)

年 卷 期：2018年第16卷第9期

页      面：60-64页

核心收录：

学科分类：081702[工学-化学工艺] 0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 0817[工学-化学工程与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：supported by the Russian Science Foundation(No.17-72-10163) 

主　　题：UCL Mechanisms and absolute quantum yield of upconversion luminescence of fluoride phosphors 

摘      要：Mechanisms of upconversion luminescence（UCL） of SrF2：Er phosphors corresponding to the 4G11∕2→4I15∕2,2H9∕2→4I15∕2,4F5∕2→4I15∕2,4F7∕2→4I15∕2,2H11∕2→4I15∕2,4S3∕2→4I15∕2,4F9∕2→4I15∕2, and 4I9∕2→4I15∕2 transitions upon excitation of the 4I11∕2 level of Er3＋ions were investigated. Energy transfer upconversion processes are responsible for the populating of the 2H9∕2,2H11∕2,4S3∕2, and 4F9∕2 levels. Cooperative process is the dominant mechanism of luminescence from 4S3∕2 and 4F9∕2 levels for SrF2：Er with high concentrations of Er3＋ions. The UCL from 4G11∕2 and 4F5∕2 is explained by excited-state absorption. Cross-relaxation processes take part in the population of 4F9∕2 and 4I9∕2 levels. For quantifying material performance, the Er3＋-concentration dependence of UCL and the absolute quantum yields of SrF2：Er were studied. The most intensive visible luminescence was obtained for SrF2：Er（14.2%） with 0.28% maximum quantum yield.