Sr_2MgSi_2O_7：Tb^(3＋),Li~＋荧光粉的合成和发光机理  

Synthesis and Luminescent Mechanism of Sr_2MgSi_2O_7:Tb^(3+),Li^+ Phosphor

作　　者：陈茜[1] 史元元[1] 陈宁远[1] 赵君风[1] 荣春英[1] 余丽萍[1] 廉世勋[1] 

机构地区：[1]湖南师范大学化学化工学院,化学生物学及中药分析教育部重点实验室,资源精细化与先进材料湖南省高校重点实验室,长沙410081

出　　处：《无机化学学报》2012年第2期233-238,共6页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.20971042);湖南省教育厅重点项目(No.10A070);国家大学生创新性实验计划(No.101054230)资助项目

摘　　要：采用高温固相法合成Sr2-mMg1-nSi2O7∶mTb3+,nLi+(m=0.03~0.50,n=m)系列荧光粉。使用X射线衍射仪和荧光光谱仪对样品的物相和发光性质进行了表征。在377 nm紫外光激发下,荧光粉的发射光谱呈多谱带发射,主峰位于490 nm,542 nm,590 nm和613 nm处,分别对应于Tb3+的5D4→7FJ(J=6,5,4,3)跃迁发射。调节Tb3+离子掺杂浓度,可实现荧光粉的发光颜色从蓝到白、黄、绿的可调发射;名义组成为Sr1.95Mg0.95Si2O7∶0.05Tb3+,0.05Li+的荧光粉在紫外光(377 nm)激发下发白光,其色坐标(0.322,0.317)接近纯白光(0.33,0.33),是一种潜在的LED用单基质白光荧光粉。The phosphors designed as Sr2-mMg1-nSi2O7∶mTb3＋,nLi＋（m=0.03~0.50,n=m） were prepared by the high temperature solid state reaction.Crystallization and optical properties were investigated by using powder X-ray diffraction and fluorescence spectrophotometer,respectively.Under the excitation of ultraviolet（377 nm）,the emission spectra of these phosphors exhibit sharp multi-emission lines peaked at about 490 nm,542 nm,590 nm and 613 nm corresponding to the 5D4→7FJ（J=6,5,4,3） typical transitions of Tb3＋,respectively.The luminescence color can be tuned from blue to white,yellow and green by adjusting the doping concentration of Tb3＋ ions.It had been found that the nominal composition Sr1.95Mg0.95Si2O7∶0.05Tb3＋,0.05Li＋ phosphor provides a white emission（0.322,0.317） that is very close to the standard white（x=0.33,y=0.33）,which shows that it is a potential single-phased white phosphor for LED-based UV-chip.

关 键 词：Sr2MgSi2O7:Tb3+ 紫外光激发 LED 白光荧光粉 

分 类 号：O482.31[理学—固体物理] O614.23[理学—物理]