Enhanced upconverted photoluminescence in Er3+ and Yb3+ codoped ZnO nanocrystals with and without Li+ ions

被引：99

作者：

Bai, Yunfeng ^{[1
]}

Wang, Yuxiao ^{[1
]}

Yang, Kun ^{[1
]}

Zhang, Xueru ^{[1
]}

Song, Yinglin ^{[1
]}

Wang, C. H. ^{[2
]}

机构：

[1] Harbin Inst Technol, Dept Phys, Harbin 150006, Peoples R China

[2] Univ Utah, Dept Chem, Salt Lake City, UT 84103 USA

来源：

OPTICS COMMUNICATIONS | 2008年 / 281卷 / 21期

关键词：

D O I：

10.1016/j.optcom.2008.07.041

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The upconversion luminescence spectral intensity of Er3+ in Er3+ a rid Yb3+ codoped ZnO nanocrystals with and Without Li+ are investigated. Yb3+ ions as a tradition sensibilizer have efficient energy transfer processes from Yb3+ (F-2(5/2)) to Er3+ (I-4(13/2), I-4(11/2), F-4(9/2)), which lead to the increment of upconversion luminescence intensity. Following by adding Li+ to the Er3+ and Yb3+ codoped ZnO nanocrystals, the upconversion intensity emitted by Er3+ ions is found greatly enhanced. The enhancement is attributed to the distortion of the local field symmetry of Er3+ ions, so increases various intra-4f transitions of Er3+ ions. Both Yb3+ and Li+ can disperse Er3+ ions in specimen, so reduced the interaction between neighboring Er3+ ions. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：5448 / 5452

页数：5

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