凝胶-燃烧法合成Sr_2MgSi_2O_7:Eu^(2+),Dy^(3+)蓝色长余辉发光材料  

Synthesis of Blue-long Afterglow Photoluminescent Materials Sr_2MgSi_2O_7:Eu^(2+),Dy^(3+) by Gel-combustion Method

作　　者：翟永清[1] 孟媛[1] 刘元红[1] 张少阳[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：《河北大学学报（自然科学版）》2007年第2期154-159,共6页Journal of Hebei University(Natural Science Edition)

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Sr2MgSi2O7:Eu02.+02,Dy03.+04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:Sr2MgSi2O7:Eu02.+02,Dy03.0+4的晶体结构为四方晶系.激发光谱为一宽带,最大激发峰位于402 nm处,次激发峰位于415 nm处,与高温固相法和溶胶-凝胶法相比,出现了明显的红移现象;发射光谱也为一宽带,最大发射峰位于468 nm附近,是典型的Eu2+的4f5d→4f跃迁导致的.与传统高温固相法相比,凝胶-燃烧法具有离子分散均匀、合成温度低、操作简单等优点,所得样品余辉时间长,可达5 h以上.同时探讨了多种工艺条件对其发光性能的影响.Sr2MgSi2O7： Eu0.02^2＋, Dy0.04^3＋ blue phosphor materials were prepared by gel-combustion method. The as-synthesized phosphors were investigated by XRD, SEM and Fluorescence spectrophotometer. The results indicate that Sr2MgSi2O7：EU0.02^2＋, Dy0.04^3＋ phosphor is tetragonal crystal structure. The excitation spectrum is a broad band and the main peak is at 402 nm, the secondary peak is at 415 nm, its excitation spectrum has a obvious red shift in comparison with traditional solid reaction and sol-gel method. The emission spectrum is also a broad band, the emission peak is at about 468 nm. It＇s ascribed to Eu^2 ＋ ions typical transition from 4fSd to 4f. The sample has a good blue-long afterglow phenomenon and the duration time can last over 5 h. The influence of some processing conditions on luminescence properties of phosphor are also discussed.

关 键 词：SR2MGSI2O7 EU^2+ DY^3+ 凝胶-燃烧法 激发光谱 发射光谱 长余辉 

分 类 号：O614.33[理学—无机化学]