Ca_(1-x)Zn_xTiO_3∶Pr^(3+),R^+(R^+=Li^+,Na^+,K^+,Rb^+,Cs^+,Ag^+)的合成和发光性质  

Syntheses and Luminescent Properties of Ca_(1-x)Zn_xTiO_3∶Pr^(3+),R^+(R^+=Li^+,Na^+,K^+,Rb^+,Cs^+,Ag^+)

作　　者：廉世勋[1] 林建华[2] 苏勉曾[2] 

机构地区：[1]湖南师范大学化学化工学院,湖南长沙410081 [2]北京大学稀土材料化学及应用国家重点实验室,北京100871

出　　处：《中国稀土学报》2001年第6期602-605,共4页Journal of the Chinese Society of Rare Earths

基　　金：湖南省教育厅重点资助项目 (99A0 5 )

摘　　要：采用X射线衍射、荧光光谱和热释发光研究了Ca1 -xZnxTiO3∶Pr3+ ,R+ 的物相组成和发光性质。Pr3+ 取代Ca2 + 形成PrCa·正电性缺陷发光中心。激发光谱是峰值位于 3 3 0nm附近的宽带谱 ,发射光谱是峰值在 613nm半宽度为 2 0nm的带谱 ,对应Pr3+ 的1 D2 -3H4 跃迁发射。发光强度和余辉随基质组分Zn/Ca摩尔比和合成温度而变化。Zn2 + 的最佳含量在 10 %～ 2 0 %。X射线衍射研究表明掺入适量的Zn2 + 物相组成为CaTiO3,Ca2 Zn4 Ti1 5O36 和Zn2 TiO4 。热释发光曲线表明掺入Zn2 + 离子后体系中形成了新的缺陷ZnTi″ ,且ZnTi″的缺陷陷阱深度大于RCa′。Long afterglow luminescence materials of nominal composition Ca 1- x Zn x TiO 3∶Pr 3+ , R + were investigated by X ray powder diffraction, fluorescent spectra and thermoluminescence. The results of X ray powder diffraction reveal there are new crystals after doping Zn 2+ ions in CaTiO 3 matrix. The excitation spectrum is a broad band peaking at 330 nm and emission spectrum peaking at 613 nm is due to a transition from 1D 2- 3H 4 of Pr 3+ ions. The luminescent intensity and afterglow are changed with the mole ratio of Ca/Zn and synthesizing temperature. Samples of composition with 20mol% Zn 2+ shows the most high intensity. The thermoluminescence indicates that the depth of new trap Zn Ti ″ formed in Ca 1- x Zn x TiO 3 matrix is higher than ones of the R Ca ′ and Ti Ti ′.

关 键 词：稀土 Ca1-xZnxTiO3:Pr^3+ 合成 发光性质 长余辉发光材料 钛酸锌钙 镨 掺杂 

分 类 号：TN104.3[电子电信—物理电子学] O482.31[理学—固体物理]