Enhancement of the upconversion luminescence intensity in Er3+ doped BaTiO3 nanocrystals by codoping with Li+ ions

被引：92
作者：
Sun, Qiu [2 ]
Chen, Xiangqun [1 ]
Liu, Zhikai [1 ]
Wang, Fuping [2 ]
Jiang, Zhaohua [2 ]
Wang, Chao [3 ]
机构：
[1] Harbin Inst Technol, Sch Mat Sci & Engn, Dept Mat Phys & Chem, Harbin 150001, Peoples R China
[2] Harbin Inst Technol, Sch Chem Engn & Technol, Harbin 150001, Peoples R China
[3] Heilongjiang Acad Sci, Inst Petrochem, Harbin 150040, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2011年 / 509卷 / 17期
基金：
黑龙江省自然科学基金;
关键词：
Luminescence; Oxygen vacancy; Local asymmetry; Decay time; PHOTOLUMINESCENCE INTENSITY; DEFECT CHEMISTRY; EMISSION; CRYSTAL; YB3+;
D O I：
10.1016/j.jallcom.2010.12.212
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：
Infrared-to-visible upconversion luminescence spectra were investigated in Er3+ doped and Er3+-Li+ codoped BaTiO3 nanocrystals following excitation with 976 nm. By introducing Li+ ions, the upconverted emission intensity is found to be greatly enhanced compared to that of the nanocrystals without Li+ ions. The enhanced luminescence might be attributed to the oxygen vacancy generated by Li+ ion incorporation in the lattices and the distortion of the local asymmetry around Er3+. We observe that excitation power dependence and decay time are increased by the incorporation of Li+ ions. Li+ ions also can reduce the OH groups in specimen, which decrease nonradiative decay from the S-4(3/2) to F-4(9/2), enhancing the upconversion emission intensities. (C) 2011 Elsevier B. V. All rights reserved.
引用
收藏
页码：5336 / 5340
页数：5
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