Strong dependence of upconversion luminescence on doping concentration in holmium and ytterbium co-doped Y_2O_3 phosphor  

作　　者：韦先涛 李勇 程学瑞 陈永虎 尹民 

机构地区：[1]Department of Physics, University of Science and Technology of China [2]School of Mathematics & Physics, Anhui University of Technology

出　　处：《Journal of Rare Earths》2011年第6期536-539,共4页稀土学报（英文版）

基　　金：Project supported by National Natural Science Foundation of China (10774140, 10904139, 11074245 and 11011120083);Knowledge Innovation Project of The Chinese Academy of Sciences (KJCX2-YW-M11);China Postdoctoral Science Foundation (20100480693);Special Founda-tion for Talents of Anhui Province, China (2007Z021)

摘　　要：Under the excitation of 980 nm diode laser, intense green emission （5F4＋5S2–5I8） of Ho3＋ was observed in Ho3＋ and Yb3＋ co-doped cubic Y2O3. The doping concentration and laser power dependence of the upconverted emission were studied. The decay curves of 5F4＋5S2 emission of Ho3＋ under the excitation of 355 nm pulse laser were measured to investigate the energy transfer process between Ho3＋ and Yb3＋. The results indicated that two-photon process was responsible for the upconversion （UC） emission. The Ho3＋ concentration of 0.04 mol.% and the Yb3＋ concentration of 5 mol.% were determined to be the best value for the strongest Ho3＋ emission under the excitation of 980 nm light. The cross-relaxation between two neighboring Ho3＋ ions and the back energy transfer from Ho3＋ to Yb3＋ were important factors for determin- ing the optimal doping concentration. This material was a promising candidate for the application in biomedical fluorescent labels for the intense green emission upon excitation of near-infrared （NIR） light.Under the excitation of 980 nm diode laser, intense green emission （5F4＋5S2–5I8） of Ho3＋ was observed in Ho3＋ and Yb3＋ co-doped cubic Y2O3. The doping concentration and laser power dependence of the upconverted emission were studied. The decay curves of 5F4＋5S2 emission of Ho3＋ under the excitation of 355 nm pulse laser were measured to investigate the energy transfer process between Ho3＋ and Yb3＋. The results indicated that two-photon process was responsible for the upconversion （UC） emission. The Ho3＋ concentration of 0.04 mol.% and the Yb3＋ concentration of 5 mol.% were determined to be the best value for the strongest Ho3＋ emission under the excitation of 980 nm light. The cross-relaxation between two neighboring Ho3＋ ions and the back energy transfer from Ho3＋ to Yb3＋ were important factors for determin- ing the optimal doping concentration. This material was a promising candidate for the application in biomedical fluorescent labels for the intense green emission upon excitation of near-infrared （NIR） light.

关 键 词：upconversion luminescence Y2O3 HOLMIUM SOL-GEL rare earths 

分 类 号：TN104.3[电子电信—物理电子学]