Upconversion Luminescence Properties of β-NaYF4:Yb3+/Er3+@β-NaYF4:Yb3+

被引：0
|
作者：
Xiang G.-T. [1 ]
Liu X.-T. [1 ]
Xia Q. [1 ]
Jiang S. [1 ]
Tang X. [1 ]
Li L. [1 ]
Zhou X.-J. [1 ]
机构：
[1] Department of Mathematics and Physics, Chongqing University of Posts and Telecommunications, Chongqing
来源：
Faguang Xuebao/Chinese Journal of Luminescence | 2020年 / 41卷 / 06期
基金：
中国国家自然科学基金;
关键词：
Energy transfer; Rare earth; Upconversion; Β-NaYF[!sub]4[!/sub;
D O I：
10.3788/fgxb20204106.0679
中图分类号：
学科分类号：
摘要：
In this work, a solvothermal process was used to synthesize the β-NaYF4:20%Yb3+/2%Er3+ core nanoparticles(NPs) and β-NaYF4:20%Yb3+/2%Er3+@β-NaYF4:x%Yb3+(x=0, 20, 50, 70, 100) core-shell NPs. The size of the core NPs and core-shell NPs is about 30 nm and 40 nm respectively, implying that the thickness of the layer is 5 nm. After coating a β-NaYF4 shell without Yb3+ doping, the upconversion(UC) intensity is increased with a factor of 14 and 25 for green emission and red emission respectively, resulting from the suppression of deexcitation of Yb3+ ions by the core-shell structure. However, the UC intensity is decreased dramatically with the increasing Yb3+ ions concentration in the shell, due to the inefficient energy transfer process between the Yb3+ ions in the shell and the Er3+ ions in the core caused by the large distance between them. As the β-NaYF4 shell completely converts to β-NaYbF4, the UC intensity decreased 98.8% and 99.4% for green and red emission, respectively. © 2020, Science Press. All right reserved.
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页码：679 / 683
页数：4
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