凝胶-燃烧法合成 Sr2MgSi2O7:Eu2+,Dy3+ 蓝色长余辉发光材料

采用凝胶-燃烧法合成了Sr2MgSi2O7:Eu2+0.02,Dy3+0.04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:Eu2+0.02,Dy3+0.04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.

Synthesis of Blue-long Afterglow Photoluminescent Materials Sr2MgSi2O7:Eu2+,Dy3+ by Gel-combustion Method

Sr_2MgSi_2O_7:Eu2 _0.02,Dy3 _0.04 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 Sr_2MgSi_2O_7:Eu2 _0.02,Dy3 _0.04 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 Eu2 ions typical transition from 4f5d 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.