Preparation and characterization of upconversion luminescent LaF3:Yb3+,Er3+/LaF3 core/shell nanocrystals

被引：15
|
作者：
Qu, Yuqiu [1 ]
Li, Meicheng [2 ]
Zhang, Liuyang [3 ]
Zhao, Liancheng [2 ]
机构：
[1] Heilongjiang Univ, Coll Phys Sci & Technol, Harbin 150080, Peoples R China
[2] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China
[3] Harbin Univ Sci & Technol, Dept Opt Informat Sci & Technol, Harbin 150080, Peoples R China
来源：
APPLIED SURFACE SCIENCE | 2011年 / 258卷 / 01期
关键词：
Core/shell; Upconversion; LaF3; Nanoparticles; FACILE SYNTHESIS; NANOPARTICLES; SURFACE; CORE; EXCITATION; PHOSPHORS; NAGDF4; WATER; LAF3; YB3+;
D O I：
10.1016/j.apsusc.2011.07.144
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
LaF3:Yb3+,Er3+/LaF3 core/shell nanocrystals were successfully synthesized using solvothermal method. The crystal structure, morphology and photoluminescence properties of as-prepared nanocrystals were investigated in detail. XRD patterns show that the obtained LaF3:Yb3+,Er3+ core and LaF3:Yb3+,Er3+/LaF3 core/shell nanocrystals exhibit hexagonal structure. The average particle size is about 9.3 nm and 11.4 nm for core and core/shell nanocrystals, respectively. Compared with LaF3:Yb3+,Er3+ nanocrystals, both the upconversion emission intensity and the lifetime increase in LaF3:Yb3+,Er3+/LaF3 core/shell nanocrystals. The enhancement can be attributed to the LaF3 shell which can eliminate the nonradiative centers on the surface of LaF3:Yb3+,Er3+ nanocrystals. (C) 2011 Elsevier B.V. All rights reserved.
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页码：34 / 37
页数：4
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