温度变化对Eu/TiO_2纳米材料的结构和光学性能的影响  

Temperature Effect on The Structure and Optical Properties of Eu/TiO_2 Nanomaterials

作　　者：曾庆光[1] 乐天[1] 邹华勇[1] 赖斐[1] 丁泽军[2] 张增明[2] 

机构地区：[1]五邑大学应用物理与材料学院,广东江门529020 [2]中国科学技术大学物理系,安徽合肥230026

出　　处：《发光学报》2011年第4期358-362,共5页Chinese Journal of Luminescence

基　　金：国家自然科学基金(11004153);广东省自然科学基金(10152902001000009);广东省科技计划项目(2009B030803015)资助项目

摘　　要：研究了温度(包括退火温度,测试温度)变化对Eu3+掺杂TiO2纳米颗粒的结构和光学性能的影响。结果表明:随着退火温度的升高,纳米颗粒的尺寸变大,Eu3+发光增强;而且当退火温度升到973 K时,纳米颗粒的形状由球状变成方形,并开始发生相变;此后Eu3+离子发光峰的强度随着温度升高明显减弱,与此同时生成了一个新的宽荧光峰(峰位在796 nm)。随着测试温度的降低,Eu3+离子发光强度逐渐减弱,宽荧光峰的强度明显增强。对上述现象的机理进行了讨论。The temperature（including annealing temperature and measurement temperature） effects on the structure and optical properties of Eu/TiO2 nanomaterials were studied.It was found that the particle size is increase with the annealing temperatures.The emission intensity of the Eu3＋ ions increases with annealing temperature,but decreases when the annealing temperature is over 973 K.Meanwhile,a broad emission band ascribed to defect states associated with Ti3＋ ions and oxygen vacancies is intensified with the increasing of annealing temperature.The fluorescence spectra at low measurement temperatures show that the emission intensity of the broad emission band is enhanced while the emission from Eu3＋ ions is weaken with the decrease of annealing temperature.The mechanism was discussed in this paper.

关 键 词：温度 Eu3+ 稀土离子 TIO2 

分 类 号：O482.31[理学—固体物理]