Eu^(3+)掺杂双钙钛矿Sr_2CaMoO_6橙红色荧光粉的结构特征及其发光性能  

Structure and Luminescent Properties of Eu^(3+) Doped Double Perovskite Sr_2CaMoO_6 Orange-Red Phosphors

作　　者：张乐[1] 鲁加加 刘金秋[1] 李月[1] 王丽熙[1] 张其土[1] 

机构地区：[1]南京工业大学材料科学与工程学院,南京210009 [2]中国中材国际工程股份有限公司(南京),南京211100

出　　处：《无机化学学报》2012年第10期2036-2042,共7页Chinese Journal of Inorganic Chemistry

基　　金：国家重点基础研究发展计划(973计划)(No.613450221);江苏省自然科学基金(No.BK2007724);江苏省普通高校研究生科研创新计划(No.CXZZ12-0410);江苏高校优势学科建设工程资助项目

摘　　要：采用EDTA-柠檬酸联合配位法制备一系列组成的(Sr1-xEux)2CaMoO6橙红色荧光粉。通过X射线衍射、拉曼光谱、扫描电镜及荧光光谱研究不同Eu3+离子掺杂浓度下Sr2CaMoO6∶Eu3+荧光粉的晶体结构、掺杂位置、形貌及其光致发光性能。Rietveld全谱拟合结果表明:掺杂后样品为(Ca/Mo)O6八面体少量倾斜的空间群为P21/n的正交双钙钛矿结构,随着Eu3+离子共掺杂浓度的增加,样品的晶胞体积减小;Eu3+离子取代八面体间隙的Sr2+位置致使双钙钛矿的T2g(1)拉曼振动模发生蓝移;在近紫外区宽而强电荷迁移带和蓝光激发下,该荧光粉分别发射以Eu3+离子5D0-7F1磁偶极跃迁为主的橙光和以5D0-7F2电偶极跃迁为主的红光,组成为(Sr0.98Eu0.02)2CaMoO6的荧光粉具有最强的橙红光发射强度,是一种潜在的适用于近紫外LED芯片的光转换红光材料。Series of （Sr1-xEux）2CaMoO6 orange-red phosphors were prepared by EDTA-eitric acid complexing method. The crystal structure, doping site, morphology, and photoluminescent properties under different Eu3＋ concentrations were investigated by XRD, Raman spectra, SEM and fluorescence spectra. The results by Rietveld method indicate that the structure of Eu3＋ doped samples is orthorhombic double-perovskite with space group P21/n and slightly tilting octahedron of （CaJMo）O6. With increasing Eu3＋ concentration, their lattice volumes decrease monotonously. Raman active mode T2g （1） is shifted to blue side resulting from the substitution of Sr2＋ in interstitial site among octahedrons by Eu3＋ ions. Under the excitation of broad and strong charge transfer band in near-UV range and blue light, the phosphor could emit a dominant orange light and a dominant red light, respectively. The （Sr0.98Eu0.02）2CaMoO6 phosphor has the strongest orange-red emission and this phosphor is a potential light conversion red material for N-UV LED chip.

关 键 词：双钙钛矿 红色荧光粉 拉曼光谱 光致发光 白光LED 

分 类 号：O482.31[理学—固体物理]