| Preparation and upconversion luminescence of monodisperse Gd2O3：Ho^3＋,Yb^3＋ nanocrystals |
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| 作者姓名： | 彭玲玲 刘碧桃 韩涛 |
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| 作者单位： | Chongqing Key Laboratory of Micro/Nano Materials Engineering and Technology, Research Center for Material Interdisciplinary Science, Chongqing University of Arts and Seience, Chongqing 402160, China |
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| 基金项目： | Project supported by National Natural Science Foundation of China （21101136） and Science and Technology Research Foundation of the Education Commission of Chongqing City, China （K J121205）Acknowledgements： Authors would like to thank the Talent Introduction Project of Chongqing University of Arts and Sci- ence （R2012CJ17） for financial support. |
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| 摘 要： | Gd2O3:Ho3+,Yb3+ nanocrystals were synthesized via solvothermal method.X-ray diffraction(XRD),transmission electron microscopy(TEM),absorption and upconversion spectra were employed to characterize the synthesized nanocrystals.The results of XRD and TEM showed that obtained Gd2O3:Ho3+,Yb3+ nanocrystals were cubic in crystal structure and uniform spherical in morphology.The average crystallite size was calculated to be 7.5 nm.Green and red up-conversion emissions corresponding to(5F4,5S2)→5I8 and 5F5 → 5I8 transition were observed upon 980 nm excitation at room temperature.The results indicated that both green and red luminescence were based on the two-photon processes.Laser power and doping concentration dependence of the upconverted emissions were studied to understand the upconversion mechanisms.Excited state absorption and energy-transfer processes were discussed as the possible mechanisms for the visible emissions.
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| 关 键 词： | Gd2O3 :Ho3+,Yb3+ nanocrystals upconversion luminescence energy transfer rare earths |
| 收稿时间： | 2013-05-07 |
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