新型长余辉发光材料SrMgSi_2O_6:Eu^(2+),Ln^(3+)的制备及性质  

Synthesis and Luminescent Properties of SrMgSi_2O_6 Co-Activated by Eu^(2+) and Rare Earth Ions

作　　者：翟永清[1] 焦芳芳[1] 郭冰[1] 冯仕华[1] 

机构地区：[1]河北大学化学与环境科学学院,河北保定071002

出　　处：《中国稀土学报》2009年第3期357-361,共5页Journal of the Chinese Society of Rare Earths

基　　金：河北省教育厅博士基金资助项目(B2004205);河北大学研究基金资助项目(y2004024)

摘　　要：采用凝胶-燃烧法合成了系列稀土离子掺杂的Sr0.94MgSi2O6:Eu20.+02,Ln03.+04(Ln=La,Ce,Nd,Sm,Gd,Dy)蓝色长余辉发光材料,用X射线粉末衍射(XRD)、扫描电镜(SEM)、荧光分光光度计等对合成产物进行了分析和表征。结果表明:掺杂了不同稀土离子的SrMgSi2O6:Eu2+,Ln3+的晶体结构均为四方晶系结构;其激发、发射光谱的峰形、峰位基本无变化,激发光谱为一宽带,最大激发峰位于400nm处,次激发峰位于415nm处,发射光谱也为一宽带,最大发射峰位于470nm附近,是典型的Eu2+的4f5d-4f跃迁导致的,不同之处在于其激发光谱、发射光谱强度及余辉性质有所差别,其中Dy3+是最理想的共掺杂稀土离子,Sr0.94MgSi2O6:Eu20.+02,Dy30.+04的余辉时间最长,可达4h;而Sm3+最差,Sr0.94MgSi2O6:Eu02.+02,Sm03.+04的余辉亮度最低,余辉时间最短。A series of phosphor materials Sr0.94MgSi2O6：Eu20.＋02,Ln03.＋04 （Ln = La, Ce, Nd, Sm, Gd, Dy） with blue long afterglow were prepared by gelcombustion method. The assynthesized phosphors were investigated by XRD, SEM and Fluorescence spectrophotometer. The results indicated that Sr0.94,MgSi2O6 ： Eu0.02, Ln0 04^3＋ phosphors had tetragonal crystal structure. The shape and position of peaks in excitation and emission spectrum kept almost same with the variation of co-doped Ln^3 ＋. The excitation spectrum was a broad band and the main peak was at 400 nm, the secondary peak was at 415 nm. The emission spectrum was also a broad band with the main peak at about 470 nm, which was ascribed to Eu^2＋ ions typical transition from 4f5d to 4f. The intensity of excitation and emission spectrum, and the long afterglow properties changed with the variation of co-doped Ln^3＋. The Dy^3＋ was the best one, Sr0.94MgSi2O6Eu0.02^2＋, Dy0.04^3＋ sample had the longest duration time （about 4 h） , while Sm^3＋ was the worst one, Sro.94MgSi2O6Eu0.02^2＋, Sm0.04^3＋ sample had the lowest brightness and the shortest duration time.

关 键 词：SrMgSi2O6:Eu2+ Ln3+ 发光 长余辉 凝胶燃烧法 稀土 

分 类 号：O614.33[理学—无机化学]