文献类型：期刊文献

英文题名：Investigation of oxygen vacancy and photoluminescence in calcium tungstate nanophosphors with different particle sizes

作者：Li, Yezhou[1];Wang, Zhaofeng[2];Sun, Luyi[3,4];Wang, Zhilong[1];Wang, Shiqin[1];Liu, Xiong[1];Wang, Yuhua[5]

第一作者：李元贞

通信作者：Wang, ZF[1]

机构：[1]Gansu Univ Tradit Chinese Med, Dept Phys, Lanzhou 730000, Peoples R China;[2]Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Solid Lubricat, Lanzhou 730000, Peoples R China;[3]Univ Connecticut, Inst Mat Sci, Dept Chem & Biomol Engn, Storrs, CT 06269 USA;[4]Univ Connecticut, Inst Mat Sci, Polymer Program, Storrs, CT 06269 USA;[5]Lanzhou Univ, Sch Phys Sci & Technol, Dept Mat Sci, Lanzhou 730000, Peoples R China

第一机构：甘肃中医药大学

通信机构：[1]corresponding author), Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Solid Lubricat, Lanzhou 730000, Peoples R China.

年份：2014

卷号：50

起止页码：36

外文期刊名：MATERIALS RESEARCH BULLETIN

收录：;EI(收录号：20134716995866);Scopus(收录号：2-s2.0-84887439886);WOS:【SCI-EXPANDED(收录号:WOS:000331920500008)】；

基金：This work was supported by the National Natural Science Foundation of China (No. 51205385). Dr. Luyi Sun acknowledges the National Science Foundation (Partnerships for Research and Education in Materials, DMR-1205670), the Air Force Office of Scientific Research (No. FA9550-12-1-0159), and the American Chemical Society Petroleum Research Fund (No. 51833-UNI7).

语种：英文

外文关键词：Optical materials; Defects; Luminescence

摘要：Calcium tungstate (CaWO4) nanophosphors with the particle sizes from 35 to 90 nm were synthesized by a hydrothermal process through exactly controlling the pre-treated conditions. The influence of particle size on oxygen vacancy and photoluminescence properties in CaWO4 nanophosphors was investigated and discussed. The crystal structure of the CaWO4 nanophosphors presented a certain level of distortion due to the high concentration of oxygen vacancy. Under 350 nm excitation, a clear green emission aroused by oxygen vacancy was observed. The possible luminescence processes for the matrix and oxygen vacancy were proposed. The luminescence spectra of the nanophosphors revealed that the emission and absorption intensity aroused by oxygen vacancy were both enhanced when the size is decreased. On the basis of the above results, the essential relationship between particle size and oxygen vacancy in CaWO4 nanophosphors was concluded that the concentration of oxygen vacancy could be increased by reducing its size, which was further confirmed by decay lifetimes. (C) 2013 Elsevier Ltd. All rights reserved.