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.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
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
关键词
共沉淀法
长余辉发光
硅酸镁锶
稀土离子
coprecipitation method
long-lasting phosphorescence
strontium magnesium disilicate
rare earth ions
