Mg^2+离子对Sr_2Al_2SiO_7∶Eu^2+荧光体微结构及发光性能的影响  

The effects of Mg^(2+) ions on the microstructure and photoluminescence of Sr_2Al_2SiO_7∶Eu^(2+) phosphor

作　　者：蒙延双 王达健[2] 武浚 刘会基 巨少华 

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：《功能材料》2008年第3期361-363,共3页Journal of Functional Materials

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

摘　　要：采用复合胶体喷雾工艺制备了Sr2Al2SiO7∶Eu2+荧光体及掺入Mg离子后Sr2-xMgxAl2SiO7∶Eu2+(x=0.1,0.2,0.4,0.6,0.8,1.0)荧光体。XRD分析及晶格常数计算结果表明,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326nm附近的宽带构成,属于Eu2+的4f→5d跃迁吸收带;发射光谱主峰位于约500nm,属于Eu2+离子4f65d→4f7跃迁导致的宽带发射。XRD结果表明Mg2+添加浓度从x=0.1~1.0增加,Mg2+离子以取代离子形式进入Sr2Al2SiO7晶格。Mg2+离子添加浓度x=0.1时对Sr2Al2SiO7∶Eu2+发射光谱影响不大,Sr1.9Mg0.1Al2SiO7∶Eu02.+02发射主峰仍位于500nm;x>0.2后,Mg2+离子取代Sr2+离子使晶体场强度减弱,Eu2+离子5d能级晶场劈裂减小,导致Sr2-xMgxAl2SiO7∶Eu2+发射峰蓝移至460nm。Sr2Al2SiO7：Eu^2＋ and Sr2-xMgxAl2SiO7 ： Eu^2＋ （x=0. 1, 0. 2, 0.4, 0.6, 0.8, 1.0） phosphors were prepared by spraying of composite sol technique. XRD results show that the Eu^2＋ ions partially substitution for Sr^2＋ sites on Sr2Al2SiO7 lattice. The excitation band of 326nm is attributed to the transition from 4f to 5d in Eu^2＋ ions of Sr2Al2SiO7： Eu^2＋ phosphor. The emission of Eu^2＋ ions 4f65d→4f^7 transition lies at about 500nm. XRD results show that Mg^2＋ ions substitute for Sr^2＋ sites on Sr2Al2SiO7 lattice. The crystal field intensity of Sr2Al2SiO7 decreases when the Sr^2＋ site is substituted with Mg^2＋ ions. The split of 5d energy level of Eu^2＋ decreases and the emission spectra of peak Sr2Al2SiO7 ： Eu^2＋ phosphor blue shifts to 460nm when substitute Sr^2＋ with Mg^2＋ ions.

关 键 词：荧光体 Sr2A12SiO7:Eu^2+ Mg^2+离子 微结构与光谱 

分 类 号：TB39[一般工业技术—材料科学与工程]