Synthesis and Luminescence Properties of LaF3：Eu3+/LaF3 Core/Shell Nanoparticles with Different Shell Thickness

NIU Shuang-shuang; YOU Fang-tian; SHI Qiu-feng; XIE Di-ni; PENG Hong-shang; HUANG SHI-hua

doi:10.3788/fgxb20143503.0276

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Synthesis and Luminescence Properties of LaF₃：Eu³⁺/LaF₃ Core/Shell Nanoparticles with Different Shell Thickness

更新时间：2020-08-12

- Synthesis and Luminescence Properties of LaF₃：Eu³⁺/LaF₃ Core/Shell Nanoparticles with Different Shell Thickness
- Chinese Journal of Luminescence Vol. 35, Issue 3, Pages: 276-281(2014)
- 作者机构：
  
  发光与光信息教育部重点实验室北京交通大学光电子技术研究所, 北京 100044
- 作者简介：
- 基金信息：
- DOI：10.3788/fgxb20143503.0276
  CLC： O482.31
- Received：08 November 2013，
  
  Revised：21 November 2013，
  
  Published：03 March 2014
- 稿件说明：
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牛双双, 由芳田, 时秋峰等. 不同壳层厚度的LaF3：Eu3+/LaF3核壳结构纳米颗粒制备及发光性质[J]. 发光学报, 2014,35(3): 276-281

NIU Shuang-shuang, YOU Fang-tian, SHI Qiu-feng etc. Synthesis and Luminescence Properties of LaF3：Eu3+/LaF3 Core/Shell Nanoparticles with Different Shell Thickness[J]. Chinese Journal of Luminescence, 2014,35(3): 276-281
牛双双, 由芳田, 时秋峰等. 不同壳层厚度的LaF3：Eu3+/LaF3核壳结构纳米颗粒制备及发光性质[J]. 发光学报, 2014,35(3): 276-281 DOI： 10.3788/fgxb20143503.0276.

NIU Shuang-shuang, YOU Fang-tian, SHI Qiu-feng etc. Synthesis and Luminescence Properties of LaF3：Eu3+/LaF3 Core/Shell Nanoparticles with Different Shell Thickness[J]. Chinese Journal of Luminescence, 2014,35(3): 276-281 DOI： 10.3788/fgxb20143503.0276.

摘要

表面缺陷会使纳米材料的发光中心产生严重的猝灭，而适当厚度的同质包覆层会减少其猝灭。本文利用共沉淀法合成了LaF

：Eu

纳米颗粒和LaF

：Eu

/LaF

核壳结构纳米颗粒，研究了颗粒的晶体结构、形貌以及不同壳层厚度对发光性能的影响。研究发现：LaF

：Eu

核心和LaF

：Eu

/LaF

核壳结构均为六方结构。包覆同质壳层可以提高稀土离子的发光性能，包覆厚度的不同导致LaF

：Eu

/LaF

核壳结构的荧光强度与衰减时间均发生改变。其原因是未掺杂的LaF

壳层可以将发光中心Eu

离子与LaF

：Eu

核心的表面隔离，进而减少表面对发光中心的猝灭，提高材料的发光性能。这种修饰作用与壳层厚度相关。

Abstract

Coating the nanoparticles with a homogeneous shell is a feasible strategy to reduce energy losses on the nanoparticle surface. Eu

doped hexagonal LaF

nanoparticles with a mean size of 7~8 nm were prepared by co-precipitation method. After coating the LaF

:Eu

core particles with the undoped LaF

the enhancement of Eu

emission in LaF

:Eu

/LaF

core-shell nanoparticles was discovered. In comparison with the LaF

:Eu

core

the luminescence lifetime of Eu

emission in core-shell nanoparticles was increased. The decay curves of LaF

:Eu

/LaF

core/shell nanoparticles with different thickness had also been studied. The increase of the luminescence lifetime of Eu

emission resulted from the effective shielding of the luminescence center Eu

ions from LaF

:Eu

core

the quenching at or near the surface of the nanoparticles was reduced.

关键词

Keywords

references

Eliseeva S V, Bnzli J C G. Lanthanide luminescence for functional materials and bio-sciences[J]. Chem. Soc. Rev., 2010, 39(1):189-227. [2] Hua J T, Chen B J, Sun J S, et al. Introduction to up-conversion luminescence of rare earth doped materials[J]. Chin. Opt.(中国光学), 2010, 3(4):301-301(in Chinese). [3] Abel K A, Boyer J C, Van Veggel F C J M. Hard proof of the NaYF4/NaGdF4 nanocrystal core/shell structure[J]. J. Am. Chem. Soc., 2009, 131(41):14644-14645. [4] Wang X, Zhuang J, Peng Q, et al. A general strategy for nanocrystal synthesis[J]. Nature, 2005, 437:121-124. [5] Xie M Y, Liao Y, Hui H, et al. Synthesis of highly fluorescent LaF3:Ln3+/LaF3 core/shell nanocrystals by a surfactant-free aqueous solution route[J]. J. Solid State Chem., 2009, 182(3):597-601. [6] Stouwdam J W, Van Veggel F C J M. Improvement in the luminescence properties and processability of LaF3/Ln and LaPO4/Ln nanoparticles by surface modification[J]. Langmuir, 2004, 20(26):11763-11771. [7] Yan R X, Li Y D. Down/up conversion in Ln3+-doped YF3 nanocrystals[J]. Adv. Funct. Mater., 2005, 15(5):763-770. [8] Pi D, Wang F, Fan X, et al. Luminescence behavior of Eu3+ doped LaF3 nanoparticles[J]. Spectrochim. Acta, Part A, 2005, 61(11):2455-2459. [9] Sudarsan V, Van Veggel F C J M, Herring R A, et al. Surface Eu3+ ions are different than "bulk" Eu3+ ions in crystalline doped LaF3 nanoparticles[J]. J. Mater. Chem., 2005, 15(13):1332-1342. [10] Du H Y, Wei Z P, Sun L J, et al. Luminescent properties of ZnS:Mn nanoparticles dependent on doping concentration[J]. Chin. Opt.(中国光学), 2013, 6(1):111-116 (in Chinese).

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