Enhancement of the upconversion photoluminescence intensity in Li+ and Er3+ codoped Y2O3 nanocrystals
Enhancement of the upconversion photoluminescence intensity in Li+ and Er3+ codoped Y2O3 nanocrystals
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DOI：
10.1016/j.optcom.2008.01.014
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发表时间：
2008-05-15
影响因子：
2.4
通讯作者：
Song, Yinglin
中科院分区：
文献类型：
--
作者：
Bai, Yunfeng;Yang, Kun;Song, Yinglin
研究了Li+和Er3+共掺Y2O3纳米晶体的红外-可见上转换发光光谱。与不含Li+的纳米晶体相比，Li+离子的引入大大增强了纳米晶体的上转换发射强度。增强的原因被认为是Er3+离子局部对称性的改变，增加了Er3+离子的4f内跃迁，以及Er3+的均匀分布。而在其他一些Er3+掺杂的氧化物中，如ZnO、ZrO2等，掺杂Li+也可以大大提高Er3+离子的上转换强度。(c) 2008 Elsevier B.V.版权所有
Infrared-to-visible upconversion luminescence spectra are investigated in Li+ and Er3+ codoped Y2O3 nanocrystals. By introducing Li+ ions, the upconverted emission intensity is found to be greatly enhanced when compared with the nanocrystals with the Li+ absent. The cause of the enhancement is believed to be the modification of the local symmetry of the Er3+ ion, which increases the intra-4f transitions of Er3+ ion, and the homogeneous distribution of Er3+. While in some other Er3+ doped oxides, such as ZnO, ZrO2, etc., the upconversion intensity of Er3+ ions could also be greatly increased by doping Li+. (c) 2008 Elsevier B.V. All rights reserved.