沉淀法合成蓝色长余辉发光材料Sr2MgSi2O7：Eu^2＋，Dy^3＋  

Synthesis of Blue Long-Lasting Phosphorescent Material Sr_2MgSi_2O_7∶Eu^(2+),Dy^(3+) by Coprecipitation Method

作　　者：陈小博[1] 李毅东[1] 艾鹏飞[1] 谭宁会[1] 刘应亮[1] 

机构地区：[1]暨南大学化学系,纳米化学研究所,广州510632

出　　处：《无机化学学报》2010年第1期79-83,共5页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.20671042,50872045);广东省自然科学基金(No.05200555,7005918)资助项目

摘　　要：采用沉淀法制备了高亮度的长余辉发光材料Sr2MgSi2O7∶Eu2+,Dy3+。通过XRD、荧光光谱和热释光谱对其进行表征。XRD测试表明所制备的Sr2MgSi2O7∶Eu2+,Dy3+为单相,四方晶。荧光光谱测试表明,用λem=467nm作为监控波长,在275~450nm之间有宽的激发光谱,峰值位于399nm。用λex=399nm激发样品,其发射光谱为一宽带,峰值位于467nm。1050℃煅烧前躯体所制备的Sr2MgSi2O7∶Eu2+,Dy3+发光性能最好。热释光谱峰值位于357K,适合长余辉现象的产生。对Sr2MgSi2O7∶Eu2+,Dy3+长余辉发光机理进行了讨论。Blue long-lasting phosphorescent materials with high brightness,Sr2MgSi2O7：Eu^2＋,Dy^3＋, were prepared by coprecipitation method. The products were characterized by XRD, phosphorescent spectra and thermoluminescence spectra. The results of XRD indicated that Sr2MgSi2O7：Eu^2＋,Dy^3＋ possessed pure phase, tetragonal crystal structure. The excitation spectrum（Aem=467 nm） and emission spectrum（λem=399 nm） of Sr2MgSi2O7：Eu^2＋,Dy^3＋ were broad band spectra, and the main excitation peaked at 399 nm, the main emission at 467 nm. The luminescent properties were the best for the as-precipitated precursor powders calcined at 1 050 ℃. The thermoluminescence spectra peaked at 357 K, which is suitable for the generation of long-lasting phosphorescence. The long-lasting phosphorescence mechanism of Sr2MgSi2O7：Eu^2＋,Dy^3＋ is discussed.

关 键 词：共沉淀法 长余辉发光 硅酸镁锶 稀土离子 

分 类 号：O614.33[理学—无机化学]