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

Guo-tao XIANG; Xiao-tong LIU; Qing XIA; Sha JIANG; Xiao TANG; Li LI; Xian-ju ZHOU

doi:10.3788/fgxb20204106.0679

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

Synthesis and Properties of Materials | 更新时间：2020-09-15

- Upconversion Luminescence Properties of β-NaYF₄:Yb³⁺/Er³⁺@β-NaYF₄:Yb³⁺
- Chinese Journal of Luminescence Vol. 41, Issue 6, Pages: 679-683(2020)
- 作者机构：
  
  1.重庆邮电大学理学院, 重庆 400065
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China;Science and Technology Research Program
- DOI：10.3788/fgxb20204106.0679
  CLC：
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Guo-tao XIANG, Xiao-tong LIU, Qing XIA, et al. Upconversion Luminescence Properties of β-NaYF₄:Yb³⁺/Er³⁺@β-NaYF₄:Yb³⁺. [J]. Chinese Journal of Luminescence 41(6):679-683(2020)
DOI：

Guo-tao XIANG, Xiao-tong LIU, Qing XIA, et al. Upconversion Luminescence Properties of β-NaYF₄:Yb³⁺/Er³⁺@β-NaYF₄:Yb³⁺. [J]. Chinese Journal of Luminescence 41(6):679-683(2020) DOI： 10.3788/fgxb20204106.0679.

摘要

利用溶剂热法制备了β-NaYF,4,：20%Yb,3+,/2%Er,3+,核颗粒和β-NaYF,4,：20%Yb,3+,/2%Er,3+,@β-NaYF,4,：,x,%Yb,3+,（,x,=0，20，50，70，100）核壳结构纳米颗粒。在未包覆β-NaYF,4,前，核纳米颗粒的尺寸约为30 nm；在包覆β-NaYF,4,壳层后，纳米颗粒的尺寸增加至40 nm左右，并且上转换绿光和红光分别提高了14倍和25倍。上转换发光强度能够增强如此之多是因为包覆的壳层有效地抑制了处于激发态的Yb,3+,与纳米颗粒表面缺陷之间的能量传递过程。随着壳层中Yb,3+,掺杂浓度的提高，纳米颗粒的尺寸并未发生明显变化，一直保持在40 nm左右。但是，纳米颗粒的上转换发光强度却随着Yb,3+,浓度的提高而明显减弱。由于在980 nm波长的激光辐照时，大部分980 nm的光子会被纳米颗粒壳层中的Yb,3+,所吸收，能够被核中的Yb,3+,所吸收的980 nm光子数目非常少。然而，由于壳层中的Yb,3+,距离核颗粒中的Er,3+,较远，使得二者之间的能量传递效率非常低，从而大大降低了纳米颗粒的上转换发光强度。

Abstract

In this work, a solvothermal process was used to synthesize the β-NaYF,4,:20%Yb,3+,/2%Er,3+, core nanoparticles(NPs) and β-NaYF,4,:20%Yb,3+,/2%Er,3+,@β-NaYF,4,:,x,%Yb,3+,(,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-NaYF,4, shell without Yb,3+, 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 Yb,3+, ions by the core-shell structure. However, the UC intensity is decreased dramatically with the increasing Yb,3+, ions concentration in the shell, due to the inefficient energy transfer process between the Yb,3+, ions in the shell and the Er,3+, ions in the core caused by the large distance between them. As the β-NaYF,4, shell completely converts to β-NaYbF,4, the UC intensity decreased 98.8% and 99.4% for green and red emission, respectively.

关键词

稀土离子上转换发光能量传递β-NaYF4

Keywords

rare earthupconversionenergy transferβ-NaYF4

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Department of Mathematics and Physics, Chongqing University of Posts and Telecommunications

Laboratory of Excited State Processes, Chinese Academy of Sciences.

Changchun Institute of Physics, Chinese Academy of Sciences

Laboratoired' Energetiqueetd' Optique, Universite de Reims, B. P. 1039, Reims Cedex

Department of Mathematics and Physics， Chongqing University of Posts and Telecommunications， 2 Chongwen Road

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