Preparation and Polychromatic Upconversion Luminescence of Hexagonal NaErF4 and NaErF4@NaYF4 Core-shell Particles

Jie CHEN; Yi-xin GAO; Chao WANG; Yu YIN; Yan-hua SONG; Xiao-dan ZENG; Hai-feng JIANG

doi:10.37188/CJL.20210373

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Preparation and Polychromatic Upconversion Luminescence of Hexagonal NaErF₄ and NaErF₄@NaYF₄ Core-shell Particles

Synthesis and Properties of Materials | 更新时间：2022-02-25

- Preparation and Polychromatic Upconversion Luminescence of Hexagonal NaErF₄ and NaErF₄@NaYF₄ Core-shell Particles
  增强出版
- Chinese Journal of Luminescence Vol. 43, Issue 2, Pages: 209-217(2022)
- 作者机构：
  
  1.吉林化工学院　分析测试中心，吉林　吉林　132022
  2.吉林大学　化学学院，吉林　长春　130012
  3.东北电力大学　能源与动力工程学院，吉林　吉林　132012
- 作者简介：
- 基金信息：
  
  Science and Technology Development Plan of Jilin Province(YDZJ202101ZYTS029);National Natural Science Foundation of China(51902125);Science and Technology Development Plan of Jilin City(20210103092)
- DOI：10.37188/CJL.20210373
  CLC：
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Jie CHEN, Yi-xin GAO, Chao WANG, et al. Preparation and Polychromatic Upconversion Luminescence of Hexagonal NaErF₄ and NaErF₄@NaYF₄ Core-shell Particles. [J]. Chinese Journal of Luminescence 43(2):209-217(2022)
DOI：

Jie CHEN, Yi-xin GAO, Chao WANG, et al. Preparation and Polychromatic Upconversion Luminescence of Hexagonal NaErF₄ and NaErF₄@NaYF₄ Core-shell Particles. [J]. Chinese Journal of Luminescence 43(2):209-217(2022) DOI： 10.37188/CJL.20210373.

摘要

采用简单的水热法合成了六角柱形NaErF,4,和NaErF,4,@NaYF,4,核壳上转换发光材料，利用扫描电镜(SEM)、X射线粉末衍射(XRD)和荧光光谱(PL)等表征对材料的形貌、结构和上转换发光性能进行了研究。结果表明，纯NaErF,4,样品为六角柱形，边长和厚度均为1 μm左右，样品表面光滑。随着NaYF,4,壳层的包覆，六角相NaErF,4,周围出现了大量的立方相NaYF,4,纳米颗粒，得到了NaErF,4,@NaYF,4,核壳结构。荧光光谱表明，通过在六角柱形NaErF,4,表面包覆NaYF,4,壳层，可以有效增强上转换发光强度，其中，位于527,543,663 nm处的3个发射峰分别对应于Er,3+,的,2,H,11/2,→,4,I,15/2,、,4,S,3/2,→,4,I,15/2,和,4,F,9/2,→,4,I,15/2,能级跃迁。随着壳层中Y∶F比例的增加，立方相NaYF,4,的晶体衍射峰逐渐增强；同时，对应的NaErF,4,@NaYF,4,样品发射光谱中红绿比(,R/G,)逐渐增大，发光颜色也从绿色、经黄绿色逐渐向黄色过渡，实现了多色发光。

Abstract

Hexagonal NaErF,4, and NaErF,4,@NaYF,4, core-shell upconversion luminescent materials were synthesized by simple hydrothermal method. The morphology, structure and upconversion luminescence properties of the obtained materials were studied by scanning electron microscopy(SEM), X-ray powder diffraction(XRD) and fluorescence spectroscopy(PL). The results show that the pure NaErF,4, sample has hexagonal column morphology with smooth surface, and the side length and thickness are both 1 μm. With the coating of NaYF,4, shell, a large number of cubic NaYF,4, nanoparticles appeared around hexagonal NaYF,4, particles, and the NaErF,4,@NaYF,4, core-shell materials were obtained. The luminescence spectra show that the upconversion luminescence intensity can be effectively enhanced by coating NaYF,4, shell on the surface of hexagonal NaErF,4,. The three emission peaks at 527, 543, 663 nm correspond to ,2,H,11/2,→,4,I,15/2,4,S,3/2,→,4,I,15/2, and ,4,F,9/2,→,4,I,15/2, energy level transitions of Er,3+, respectively. Meanwhile, with the increase of the molar ratio of Y∶F in the shell of NaErF,4,@NaYF,4, sample, the crystal diffraction peak of cubic NaYF,4, increases gradually, moreover, the red green ratio(,R/G,) gradually increases in the emission spectrum of the sample, and the luminescence color gradually transits from green to yellow, realizing multi-color luminescence.

关键词

上转换荧光NaErF4@NaYF4；红绿比六角柱

Keywords

upconversion luminescenceNaErF4@NaYF4red green ratiohexagonal column

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College of Materials Science and Engineering, China Jiliang University

State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University

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