| Energy transfer in Tb~（3＋）,Yb~（3＋） codoped Lu_2O_3 near-infrared downconversion nanophosphors |
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| 引用本文： | 李丽,韦先涛,陈永虎,郭常新,尹民. Energy transfer in Tb~（3＋）,Yb~（3＋） codoped Lu_2O_3 near-infrared downconversion nanophosphors[J]. 中国稀土学报(英文版), 2012, 30(3): 197-201. DOI: 10.1016/S1002-0721(12)60022-2 |
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| 作者姓名： | 李丽 韦先涛 陈永虎 郭常新 尹民 |
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| 作者单位： | Department of Physics, University of Science and Technology of China;College of Mathematics and Physics, Chongqing University of Posts and Telecommunications |
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| 基金项目： | Project supported by National Natural Science Foundation of China (10774140, 11047147, 11074245, 11011120083);Knowledge Innovation Project of The Chinese Academy of Sciences (KJCX2-YW-M11);the Natural Science Foundation of Chongqing Municipal Education Commission (KJTD201016, KJ090514) |
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| 摘 要： | Tb3+ and Yb3+ codoped Lu2O3 nanophosphors were synthesized by the reverse-strike co-precipitation method. The obtained Lu2O3:Tb3+,Yb3+ nanophosphors were characterized by X-ray diffraction (XRD) and photoluminescence (PL) spectra. The XRD results showed that all the prepared nanophosphors could be readily indexed to pure cubic phase of Lu2O3 and indicated good crystallinity. The Tb3+→Yb3+ energy transfer mechanisms in the UV-blue region in Lu2O3 nanophosphors were investigated. The experimental results showed that the strong visible emission around 543 nm from Tb3+ (5D4→7F5) and near-infrared (NIR) emission around 973 nm from Yb3+ (2F5/2→2F7/2) of Lu2O3:Tb3+,Yb3+ nanophosphors were observed under ultraviolet light excitation, respectively. Tb3+ could be effectively excited up to its 4f75d1 state and relaxed down to the 5D4 level, from which the energy was transferred cooperatively to two neighboring Yb3+. The Yb3+ concentration dependent luminescent properties and lifetimes of both the visible and NIR emissions were also studied. The lifetime of the visible emission decreased with the increase of Yb3+ concentration, verifying the efficient energy transfer from the Tb3+ to the Yb3+. Cooperative energy transfer (CET) from Tb3+ to Yb3+ was discussed as a possible mechanism for the near-infrared emission. When doped concentrations were 1 mol.% Tb3+ and 2 mol.% Yb3+, the intensity of NIR emission was the strongest.
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| 关 键 词： | Lu2O3:Tb3+,Yb3+ nanophosphors precipitation downconversion cooperative energy transfer rare earths |
| 收稿时间： | 2011-08-17 |
Energy transfer in Tb3+,Yb3+ codoped Lu2O3 near-infrared downconversion nanophosphors |
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| LI Li,WEI Xiantao,CHEN Yonghu,GUO Changxin,YIN Min. Energy transfer in Tb3+,Yb3+ codoped Lu2O3 near-infrared downconversion nanophosphors[J]. Journal of Rare Earths, 2012, 30(3): 197-201. DOI: 10.1016/S1002-0721(12)60022-2 |
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| Authors: | LI Li WEI Xiantao CHEN Yonghu GUO Changxin YIN Min |
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| Affiliation: | 1 (1. Department of Physics, University of Science and Technology of China, Hefei 230026, China; 2. College of Mathematics and Physics, Chongqing University of Posts and Telecommunications, Chongqing 400065, China) |
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| Abstract: | Tb3+ and Yb3+ codoped Lu2O3 nanophosphors were synthesized by the reverse-strike co-precipitation method. The obtained Lu2O3:Tb3+,Yb3+ nanophosphors were characterized by X-ray diffraction (XRD) and photoluminescence (PL) spectra. The XRD results showed that all the prepared nanophosphors could be readily indexed to pure cubic phase of Lu2O3 and indicated good crystallinity. The Tb3+→Yb3+ energy transfer mechanisms in the UV-blue region in Lu2O3 nanophosphors were investigated. The experimental results showed that the strong visible emission around 543 nm from Tb3+ (5D4→7F5) and near-infrared (NIR) emission around 973 nm from Yb3+ (2F5/2→2F7/2) of Lu2O3:Tb3+,Yb3+ nanophosphors were observed under ultraviolet light excitation, respectively. Tb3+ could be effectively excited up to its 4f75d1 state and relaxed down to the 5D4 level, from which the energy was transferred cooperatively to two neighboring Yb3+. The Yb3+ concentration dependent luminescent properties and lifetimes of both the visible and NIR emissions were also studied. The lifetime of the visible emission decreased with the increase of Yb3+ concentration, verifying the efficient energy transfer from the Tb3+ to the Yb3+. Cooperative energy transfer (CET) from Tb3+ to Yb3+ was discussed as a possible mechanism for the near-infrared emission. When doped concentrations were 1 mol.% Tb3+ and 2 mol.% Yb3+, the intensity of NIR emission was the strongest. |
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| Keywords: | Lu2O3:Tb3+,Yb3+ nanophosphors precipitation downconversion cooperative energy transfer rare earths |
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