文献类型：期刊文献

英文题名：The unusual variations of photoluminescence and afterglow properties in monoclinic ZrO₂ by annealing

作者：Wang, Zhilong[1];Zhang, Jiachi[2];Zheng, Guisen[1];Liu, Yongqi[1];Zhao, Yali[1]

第一作者：Wang, Zhilong

通信作者：Wang, ZL[1]

机构：[1]Gansu Univ Tradit Chinese Med, Lanzhou 730000, Peoples R China;[2]Lanzhou Univ, Sch Phys Sci & Technol, Lanzhou 730000, Peoples R China

第一机构：甘肃中医药大学

通信机构：[1]corresponding author), Gansu Univ Tradit Chinese Med, Lanzhou 730000, Peoples R China.|[10735]甘肃中医药大学;

年份：2012

卷号：132

期号：11

起止页码：2817

外文期刊名：JOURNAL OF LUMINESCENCE

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000308627400001)】；

基金：This work is supported by the National Nature Science Foundation of China (81060351), the National Nature Science Young Foundation of China (10904057), the Gansu Province Medicine Scientific Research Program (GZK-2010-54) and the Fundamental Research Funds for Central Universities (Lzjbky-2011-125).

语种：英文

外文关键词：Optical materials; Optical properties

摘要：The raw ZrO2 is annealed at 600-1550 degrees C for 6 h. It is found that the emission at 492 nm increases greatly when the annealing temperature is higher than 1200 degrees C and its afterglow shows a small improvement at 1200-1450 degrees C and a large enhancement after annealing at 1550 degrees C. The results that are obtained indicate that the impurity Ti4+ in ZrO2 is efficiently reduced to Ti3+ when the temperature is higher than 1200 degrees C, and the increase of Ti3+ centers contributes to the large improvement of emission at 492 nm. The thermoluminescence shows that at least two types of traps with different depths (0.65 eV and 1.46 eV) corresponding to oxygen vacancies exist in monoclinic ZrO2. After annealing at 1200-1450 degrees C, some new trap clusters related to oxygen vacancies and Ti3+ form and causes the small improvement of afterglow at 1200-1450 degrees C. The large improvement of afterglow after annealing at 1550 degrees C originates from the sharp increase of proper shallow traps (0.65 eV) in ZrO2. Accordingly, we present the feasible interpretations and luminescence mechanisms of monoclinic ZrO2 for our observations. (C) 2012 Elsevier B.V. All rights reserved.