Ce3＋,Tb3＋,Eu3＋共掺杂Sr2MgSi2O7体系的白色发光和能量传递机理  

White-light Emitting and Energy Transfer Mechanism in the Ce^(3+),Tb^(3+) and Eu^(3+) co-Doped Sr_2MgSi_2O_7 Phosphor

作　　者：吴静[1] 张吉林[1] 周文理[1] 荣春英[1] 余丽萍[1] 李承志[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：《高等学校化学学报》2013年第2期306-312,共7页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20971042);湖南省教育厅重点项目(批准号:10A070);湖南省高校科技创新团队支持计划(批准号:湘教通[2012]318号)资助

摘　　要：通过正交试验,采用高温固相法制备了Sr2-x-y-zMgSi2O7∶xCe3+,yTb3+,zEu3+系列样品.使用X射线衍射仪和荧光光谱仪表征了样品的物相和发光性质,并讨论了Ce3+-Tb3+-Eu3+共掺杂Sr2MgSi2O7体系中的能量传递过程.实验结果表明,在327 nm波长激发下,所合成荧光粉的发射峰主要位于387 nm(蓝紫)、542nm(绿)和611 nm(红)处;分别以387,542和611 nm为监控波长,所得激发光谱显示荧光粉在327 nm处有最好的激发.在327 nm光激发下,系列样品发光进入白光区.最优化的荧光粉为Sr1.91MgSi2O7∶0.01Ce3+,0.05Tb3+,0.03Eu3+,其色坐标为(0.337,0.313),是一种潜在的发光二极管(LED)用白色荧光粉.Sr2MgSi2O7∶ Ce3＋,Tb3＋,Eu3＋ phosphors were prepared by high temperature solid state reaction.Crystallization and optical properties were investigated via powder X-ray diffraction and fluorescence spectra,respectively.Under the excitation of ultraviolet（327 nm）,the emission spectra of these phosphors exhibited multi-emission lines peaked at about 387（blue-purple color）,542（green color） and 611 nm（red color）.Monitored at 387,542 and 611 nm,respectively,the Sr2MgSi2O7∶ Ce3＋,Tb3＋,Eu3＋ powder got optimally excited at λex=327 nm,the Sr2MgSi2O7∶ Tb3＋ powder got optimally excited at λex=235 nm.It has been found that the chromaticity coordinates（0.337,0.313） for the nominal composition Sr1.91MgSi2O7∶ 0.01Ce3＋,0.05Tb3＋,0.03Eu3＋ is very close to the CIE（Commission International de I′Eclairage 1931 chromaticity） standard white coordinates（0.33,0.33）,showing that Sr1.91MgSi2O7∶ 0.01Ce3＋,0.05Tb3＋,0.03Eu3＋ is a potential single-phased white phosphor for LED-based UV-chip.The energy transfer processes from Ce3＋ to Tb3＋ and from Ce3＋ to Eu3＋ were discussed.There may be two kinds of energy transfer process in the Sr2MgSi2O7∶ Ce3＋,Tb3＋,Eu3＋ system,which is from Ce3＋（5d） to Eu3＋（5D4）＋Tb3＋（5D3,4） and Tb3＋（5D2,3）→Ce3＋（5d）→Eu3＋（5L6）.

关 键 词：SR2MGSI2O7 Ce3+ Tb3+ Eu3+ 白色荧光粉 白光发光二极管(LED) 能量传递 

分 类 号：O614.23[理学—无机化学] O482.31[理学—化学]