Strong dependence of upconversion luminescence on doping concentration in holmium and ytterbium co-doped Y2O3 phosphor
来源期刊：JOURNAL OF RARE EARTHS2011年第6期
论文作者：韦先涛 李勇 程学瑞 陈永虎 尹民
文章页码：536 - 539
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.
韦先涛1，李勇2，程学瑞1，陈永虎1，尹民1
1. Department of Physics, University of Science and Technology of China2. School of Mathematics & Physics, Anhui University of Technology
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.
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