| Enhanced ultraviolet upconversion in YF3：Yb^3＋/Tm^3＋ nanocrystals |
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| 引用本文： | 王国凤,秦伟平,王丽丽,尉国栋,朱培芬,张代生,丁福恒.Enhanced ultraviolet upconversion in YF3：Yb^3＋/Tm^3＋ nanocrystals[J].中国稀土学报(英文版),2009,27(2):330-333. |
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| 作者姓名： | 王国凤 秦伟平 王丽丽 尉国栋 朱培芬 张代生 丁福恒 |
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| 作者单位： | State Key Laboratory on Integrated Optoelectronics,College of Electronic Science & Engineering,Jilin University,Changchun 130012,China
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| 摘 要： | Unusual intense infrared-to-ultraviolet upconversion luminescence was observed in YF3:Yb3+(20%)/Tm3+(1%) nanocrystals under 980 nm excitation. The intense ultraviolet emissions (1I6→3H6, 1I6→3F4, and 1D2→3H6) were affirmed arising from the excitation processes of five-photon and four-photon. In comparison with the bulk sample with the same chemical compositions, ultraviolet upconversion lumi-nescence of the nanocrystals was markedly enhanced. Spectral analysis indicated that the enhancement was attributed to the decrease of Judd-Ofelt parameter Ω2, which precluded the transition rate from 3F2 to 3F4, enhanced the energy transfer process and populated the 1D2 level: 3F2→3H6 (Tm3+): 3H4→1D2 (Tm3+).
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| 关 键 词： | 紫外线辐射 纳米晶体 上转换发光 化学成分 转移过程 镱 铥 谱分析 |
| 收稿时间： | 14 May 2008 |
Enhanced ultraviolet upconversion in YF3:Yb3+/Tm3+ nanocrystals |
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| WANG Guofeng,QIN Weiping,WANG Lili,WEI Guodong,ZHU Peifen,ZHANG Daisheng,DING Fuheng.Enhanced ultraviolet upconversion in YF3:Yb3+/Tm3+ nanocrystals[J].Journal of Rare Earths,2009,27(2):330-333. |
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| Authors: | WANG Guofeng QIN Weiping WANG Lili WEI Guodong ZHU Peifen ZHANG Daisheng DING Fuheng |
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| Affiliation: | ((State Key Laboratory on Integrated Optoelectronics, College of Electronic Science ＆ Engineering, Jilin University, Changchun 130012, China) |
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| Abstract: | Unusual intense infrared-to-ultraviolet upconversion luminescence was observed in YF3:Yb3+(20%)/Tm3+(1%) nanocrystals under 980 nm excitation. The intense ultraviolet emissions (1I6→3H6, 1I6→3F4, and 1D2→3H6) were affirmed arising from the excitation processes of five-photon and four-photon. In comparison with the bulk sample with the same chemical compositions, ultraviolet upconversion luminescence of the nanocrystals was markedly enhanced. Spectral analysis indicated that the enhancement was attributed to the decrease of Judd-Ofelt parameter Ω2, which precluded the transition rate from 3F2 to 3F4, enhanced the energy transfer process and populated the 1D2 level: 3F2→3H6 (Tm3+): 3H4→1D2 (Tm3+). |
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| Keywords: | upconversion luminescence nanocrystals Judd-Ofelt parameter rare earths |
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