Preparation of LiLu1-xYbxF4:Tm@LiGdF4 Core-shell Nanocrystals with Enhanced Upconversion Luminescence

ZHAI Xue-song; LIU Shi-hu; FAN Liu-yan; LIU Jie; JIAO Bao-xiang; WANG Li-li

doi:10.3788/fgxb20173809.1149

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Preparation of LiLu_1-xYb_xF₄:Tm@LiGdF₄ Core-shell Nanocrystals with Enhanced Upconversion Luminescence

更新时间：2020-08-12

- Preparation of LiLu_1-xYb_xF₄:Tm@LiGdF₄ Core-shell Nanocrystals with Enhanced Upconversion Luminescence
- Chinese Journal of Luminescence Vol. 38, Issue 9, Pages: 1149-1154(2017)
- 作者机构：
  
  1. 盐城工学院材料工程学院,江苏盐城,224051
  2. 长春工业大学材料科学高等研究院,吉林长春,130012
- 作者简介：
- 基金信息：
  
  Supported by National Natural Science Foundation of China (11504317,61405016);Univ
- DOI：10.3788/fgxb20173809.1149
  CLC： O482.31
- Received：24 February 2017，
  
  Revised：22 April 2017，
  
  Published Online：22 June 2017，
  
  Published：05 September 2017
- 稿件说明：
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翟雪松, 刘世虎, 范柳燕等. 强上转换发光的LiLu1-xYbx F4:Tm@LiGdF4核壳纳米晶的制备[J]. 发光学报, 2017,38(9): 1149-1154

ZHAI Xue-song, LIU Shi-hu, FAN Liu-yan etc. Preparation of LiLu1-xYbxF4:Tm@LiGdF4 Core-shell Nanocrystals with Enhanced Upconversion Luminescence[J]. Chinese Journal of Luminescence, 2017,38(9): 1149-1154
翟雪松, 刘世虎, 范柳燕等. 强上转换发光的LiLu1-xYbx F4:Tm@LiGdF4核壳纳米晶的制备[J]. 发光学报, 2017,38(9): 1149-1154 DOI： 10.3788/fgxb20173809.1149.

ZHAI Xue-song, LIU Shi-hu, FAN Liu-yan etc. Preparation of LiLu1-xYbxF4:Tm@LiGdF4 Core-shell Nanocrystals with Enhanced Upconversion Luminescence[J]. Chinese Journal of Luminescence, 2017,38(9): 1149-1154 DOI： 10.3788/fgxb20173809.1149.

摘要

利用高温热分解法制备了LiLuF

：Yb，Tm@LiGdF

核壳纳米晶。在980 nm激光激发下，与未包覆的样品相比，LiLuF

：Yb，Tm@LiGdF

核壳纳米晶的发光增强了15倍左右，这主要是因为通过惰性壳层的包覆可以有效抑制表面猝灭效应。另外，随着核中Yb

离子的摩尔分数从20%增加到100%，上转换发光强度逐渐增大，最大增加了12.4倍左右。这主要是由于增加Yb

离子的浓度可以增加纳米粒子对激发光的吸收和提高Yb

到Tm

的能量传递速率。所制备的LiYbF

：2%Tm@LiGdF

核壳纳米晶的发光效率高达4%。

Abstract

LiLuF

:Yb

Tm@LiGdF

core-shell nanoparticles were synthesized by high temperature thermal decomposition method. Under the excitation of980 nm near infrared (NIR) laser

the luminescence intensity of the core-shell nanoparticles can be enhanced by about 15 times in contrast to the pure LiLuF

core. It is due to the passivating role of the inert-shell for protecting Tm

ions in the core from nonradiative decay caused by surface defects. The intensity of the UC emission of the nanocrystals increases (at most 12.4 times) as the mole fraction of Yb

ions increases from 20% to 100%

owing to the improvement of near-infrared absorption and energy-transfer from Yb

to Tm

. LiYbF

:2%Tm@LiGdF

core-shell nanoparticles show a high absolute UC quantum yield of 4.0%.

关键词

Keywords

references

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