CaSO_4∶Dy(Tm),Li低温热释光光谱研究  

Low Temperature Thermoluminescence Spectra of CaSO_4∶Dy(Tm),Li Phosphor

作　　者：王亚芳[1,2] 杨百瑞[3] Peter Townsend 

机构地区：[1]中国地质大学(北京)矿物材料国家专业实验室,北京100083 [2]中国地质大学(北京)材料科学与工程学院,北京100083 [3]北京师范大学物理学系,北京100875 [4]School of Science and Technology,University of Sussex

出　　处：《人工晶体学报》2010年第B06期217-220,共4页Journal of Synthetic Crystals

基　　金：中国地质大学(北京)矿物材料国家专业实验室项目(09A005)资助

摘　　要：本文测量了磷光发光材料CaSO4∶Dy,Li和CaSO4∶Tm,Li经X射线辐照后在低温区域(25～280K)的三维热释光光谱。结果表明:两种样品的发光光谱分别由稀土元素Dy的特征发光(470nm,570nm,655nm)和Tm的特征发光(340nm,360nm,455nm,480nm)组成;发光峰分别出现在40K,100K,200K和240K,主要是由基体材料CaSO4∶Li决定的;两种样品在240K附近的热释光发光峰温有5K左右的差别,这表明掺稀土元素的CaSO4样品其热释光发光所涉及的俘获中心是受稀土元素扰动的,可能和稀土元素的半径相关。The thermoluminescence （TL） spectra of CaSO4： Dy, Li and CaSO4： Tm, Li were collected at the low temperature range from 25 K to 280 K after irradiated by X rays. The result shows that the emission bands of CaSO4： Dy, Li are the characteristic emissions of Dy^3＋ , which are 470 nm,570 nm and 655 nm. As for CaSO4： Tm, Li, they are 340 nm,360 nm, 455 nm and 480 nm. The peak temperatur6s＇ of the two samples are 40 K, 100 K,200 K and 240 K which are mainly controlled by CaSO4：Li. There is a 5 K shift of the glow peak which is around 240 K between two samples. These data stro.ngly suggest that the trapping and recombination sites may be modulated by the size of rare earth dopants.

关 键 词：热释光 CaSO4:Dy LI CaSO4:Tm LI 

分 类 号：O433[机械工程—光学工程]