Issue 3, 2012

Enhanced upconversion emission in Yb3+ and Er3+ codoped NaGdF4nanocrystals by introducing Li+ ions

Abstract

β-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 β-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 β-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 β-NaGdF4 : Yb3+/Er3+ NPs exhibited paramagnetic features at room temperature and the magnetization was slightly increased by introducing Li+ ions.

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

Supplementary files

Article information

Article type
Paper
Submitted
21 Sep 2011
Accepted
27 Oct 2011
First published
12 Dec 2011

Nanoscale, 2012,4, 779-784

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

Q. Cheng, J. Sui and W. Cai, Nanoscale, 2012, 4, 779 DOI: 10.1039/C1NR11365H

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