甘氨酸燃烧法合成Sr_2CeO_4及其发光性质研究  

Synthesis of Sr_2CeO_4by glycine combustion method and its luminescent properties

作　　者：翟永清[1] 杨国忠[1] 周雪玲[1] 刘红梅[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：《材料科学与工艺》2008年第3期370-373,共4页Materials Science and Technology

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：为制备具有优良性能的蓝色荧光粉，首次采用甘氨酸-硝酸盐燃烧法合成了Sr2CeO4，利用热重-差热分析仪、X射线粉末衍射仪、扫描电镜等技术对其形成过程、物相结构、形貌粒度、发光性质进行了研究．结果表明：燃烧后的前驱物经800℃焙烧已有目标产物Sr2CeO4生成，1100℃时可得到较纯正交晶系的Sr2CeO4相．颗粒的形貌为不规则球形，平均粒径在80nm左右．发光性质研究表明：Sr2CeO4荧光粉的激发光谱是宽带双峰结构，此宽带属于Ce^4＋的电荷迁移带，两个峰分别位于305nm和348nm，后者为主峰．用348nm紫外光激发样品，发出明亮的蓝光，其发射光谱也是一个宽带，最大峰位于470nm，此峰属于Ce^4＋的f→t1g跃迁．发光强度在800-1100℃随温度升高而增强．In order to prepare blue-emitting phosphor with excellent properties, Sr2CeO4 was synthesized successfully by a glycine-nitrate combustion process. The reaction process, the phases and structure, the size and morphology, and the luminescent properties of as-synthesized samples were investigated respectively by XRD, SEM and spectrophotometer. The results show that the target occurs when the precursor is calcined at 800 ℃, and the perfect orthorhombic Sr2CeO4can be gained when the precursor is calcined at 1100 ℃. The particles of Sr2CeO4 obtained at 1100 ℃ are nearly spherical in shape, and the mean particle size is about 80 nm. The excitation spectrum of Sr2CeO4 phosphor displays a broad band with two peaks around 305 nm and 348 nm respectively; the latter peak is much stronger than the former one. The broad band is due to the charge transfer （CT） band of the Ce^4＋ ion. Excited with a radiation of 348 nm, the as-synthesized phosphor emits strong blue-white fluorescence, and the emission spectrum shows a broad band with a peak around 470 nm, which can be assigned to the f→t1g transition of Ce^4＋ . It is found that the emission intensity increases with the calcination temperature from 800 ℃ to 1100 ℃.

关 键 词：甘氨酸 燃烧法 SR2CEO4 荧光粉 

分 类 号：O482.31[理学—固体物理]