复合胶体喷雾自组装Sr_2Al_2SiO_7∶Eu^(2+)荧光体及其发光特性  

Photoluminesent Characteristics of Self-Assembled Sr_2Al_2SiO_7∶Eu^(2+) Phosphor Obtained by Composite Sol Spraying Technique

作　　者：蒙延双 王达健[2] 武浚 刘会基 

机构地区：[1]国家镍钴新材料工程技术研究中心 [2]天津理工大学材料物理研究所,天津300191

出　　处：《光学学报》2007年第12期2235-2239,共5页Acta Optica Sinica

基　　金：国家自然科学基金(50364002);天津市自然科学基金(06YFJMJC02300)资助课题

摘　　要：采用AlOOH/Sr(NO3)2/SiO2/Eu复合胶体喷雾工艺制备了D50=3.83μm球形Sr2Al2SiO7∶Eu2+梯次结构荧光粉。复合胶体喷雾过程形成雾滴,雾滴中纳米粒子组分在表面张力及毛细管力作用下自组装形成梯次结构干凝胶粉。干凝胶粉经1300℃灼烧得到梯次结构Sr2Al2SiO7∶Eu2+荧光粉。X射线衍射(XRD)分析及晶格常量计算结果表明,Eu2+离子部分取代Sr2+格位进入Sr2Al2SiO7晶格。Sr2Al2SiO7∶Eu2+荧光体激发谱由峰值位于326 nm附近的宽带构成,属于Eu2+的4f→5d跃迁吸收带;发射光谱峰值波长位于约500 nm处,属于Eu2+离子4f65d到4f7跃迁导致的宽带发射。Spherical Sr2Al2 SiOT： Eu^2＋ phosphor was prepared by spraying of AlOOH/Sr（NO3 ）2/SiO2/Eu composite sol technique. Three-dimensional oriented dry xerosol particle was obtained due to the self-assembly of nanoscaled pseudoboehmite sol particles and SiO2 nanoparticles. Hierarchical Sr2Al2SiO7：Eu^2＋ phosphor particles were obtained by sintering dry xerosol particles at 1300℃. XRD results show that the Eu^2＋ ions partially substitute for Sr^2＋ sites on Sr2Al2SiO7 lattice. The excitation band of 326 nm is attributed to the transition from 4f to 5d in Eu2＋ ions of Sr2Al2SiO7：Eu^2＋ phosphor. The emission of Eu2＋ ions 4f^6 5d→4f^7 transition lies at -500 nm.

关 键 词：光学材料 荧光体 Sr2Al2SiO7:Eu^2+ 离子 自组装 

分 类 号：TB39[一般工业技术—材料科学与工程]