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

被引：317

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：

070301 [无机化学];

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.

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页码：779 / 784

页数：6

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