Ho^(3+)对CaGa_2S_4:Eu^(2+)发光性能的影响  

Effect of Ho^(3+) Ion on Luminescent Property of CaGa_2S_4:Eu^(2+)

作　　者：郭崇峰[1] 张纯祥[2] 吕玉华[3] 唐强[2] 苏锵[1] 

机构地区：[1]中山大学光电材料与技术国家重点实验室中山大学化学与化学工程学院,广东广州510275 [2]中山大学物理系,广东广州510275 [3]中国科学院长春应用化学研究所稀土化学与物理实验室

出　　处：《中国稀土学报》2004年第5期591-595,共5页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金(20171046);广东省自然科学基金(21423452)资助项目

摘　　要：研究了二价铕离子与三价钬离子共同掺杂的荧光体CaGa2S4∶Eu2+(0.5%),Ho3+(1 0%)的荧光、三维热释发光及其长余辉发光特性。作为对比,同时研究了CaGa2S4∶Eu2+(0.5%)及CaGa2S4∶Ho3+(1 0%)的荧光和三维热释发光性质,发现CaGa2S4∶Eu2+(0.5%),Ho3+(1 0%)的发射波长为552nm的黄绿色余辉长达40min,CaGa2S4∶Eu2+(0.5%)不具有长余辉,而CaGa2S4∶Ho3+(1.0%)具有很弱的余辉。热释光及其三维图谱的研究表明,由于Ho3+的引入而产生了一个新的陷阱能级,从而使CaGa2S4∶Eu2+(0.5%),Ho3+(1.0%)具有长余辉的发光特性。The afterglow luminescent property and thermo-luminescence (TL) of CaGa_2S_4∶Eu^(2+), Ho^(3+) were systematcally investigated. The afterglow of Eu and Ho Co-doped CaGa_2S_4 shows a broadband emission at 552 nm, which is the same as that of Eu doped CaGa_2S_4 only. And the decay behavior of CaGa_2S_4∶Eu^(2+), Ho^(3+) was investigated, which shows that (CaGa_2S_4∶)Eu^(2+),Ho^(3+) is a phosphor with long afterglow, whereas the CaGa_2S_4∶Eu^(2+) is a phosphor without long afterglow. Comparison of TL curves and 3D-TL emission spectra of CaGa_2S_4∶Eu^(2+), Ho^(3+) and CaGa_2S_4∶Eu^(2+) show that a new trap center is produced at about 80 ℃, which is the basic reason of CaGa_2S_4∶Eu^(2+), Ho^(3+) with long afterglow.

关 键 词：发光学 余辉 CaGa2S4 铕 钬 热释光 稀土 

分 类 号：O482.31[理学—固体物理]