Enhanced upconversion emission in Yb3+ and Er3+ codoped NaGdF4 nanocrystals by introducing Li+ ions

被引：276
作者：
Cheng, Qian [1 ,2 ]
Sui, Jiehe [1 ]
Cai, Wei [1 ]
机构：
[1] Harbin Inst Technol, Natl Key Lab Mat Behav & Evaluat Technol Space En, Harbin 150001, Peoples R China
[2] NE Forestry Univ, Sch Mat Sci & Engn, Harbin 150040, Peoples R China
来源：
NANOSCALE | 2012年 / 4卷 / 03期
关键词：
YB3+/ER3+-CODOPED Y2O3 NANOCRYSTALS; LUMINESCENCE; PHASE;
D O I：
10.1039/c1nr11365h
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
beta-NaGdF4 : Yb3+/Er3+ nanoparticles (NPs) codoped with Li+ ions were prepared for the first time via a thermal decomposition reaction of trifluoroacetates in oleylamine. The influence of site occupancy of Li+ on the upconversion emission of beta-NaGdF4 : Yb3+/Er3+ NPs was investigated in detail. The upconversion emission intensity was significantly enhanced by introducing different concentrations of Li+ ions. In contrast to lithium-free beta-NaGdF4 : Yb3+/Er3+, the green and red UC emission intensities of the NPs codoped with 7 mol% Li+ ions were enhanced by about 47 and 23 times, respectively. The luminescence enhancement should be attributed to the distortion of the local asymmetry around Er3+ ions. The mechanisms for the enhancement of upconversion emission were discussed. In addition, it was found in our research work that beta-NaGdF4 : Yb3+/Er3+ NPs exhibited paramagnetic features at room temperature and the magnetization was slightly increased by introducing Li+ ions.
引用
收藏
页码：779 / 784
页数：6
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