白光二极管用荧光粉LiBaPO_4:Tb^(3+)的制备及发光性质  

PREPARTION AND LUMINESCENT PROPERTIES OF LiBaPO_4:Tb^(3+) PHOSPHOR FOR WHITE LIGHT-EMITTING DIODES

作　　者：杨志平[1] 王凤和[1] 郭颖楠[1] 杨艳民[1] 马欣[1] 李旭[1] 

机构地区：[1]河北大学物理科学与技术学院,河北保定071002

出　　处：《硅酸盐学报》2010年第6期1107-1111,共5页Journal of The Chinese Ceramic Society

基　　金：河北省自然科学基金(F2009000217)资助项目

摘　　要：采用高温固相法合成白光发光二极管用绿色荧光粉LiBaPO4:Tb3+,并研究荧光粉的发光性质。测定荧光粉的激发光谱和发射光谱,发射峰由位于436nm(5D3→7F4)、490nm(5D4→7F6)、544nm(5D4→7F5)、587nm(5D4→7F4)及621nm(5D4→7F3)的五组线状峰构成,对应Tb3+的特征跃迁,其中544nm处的最强,样品呈现绿色发光。激发光谱由4f75d1宽带吸收(200～280nm)和4f–4f电子跃迁吸收(330～390nm)组成,其中以380nm处的激发峰最强,可被紫外发光二极管(ultraviolet-light-emittingdiode,UV-LED)有效激发。研究Tb3+掺量(摩尔分数,下同)对发光亮度的影响,结果显示:当Tb3+掺量为9%时,荧光粉的亮度最高,之后出现浓度淬灭现象。Na+、K+和Cl–作为电荷补偿剂均能提高发光亮度,以Cl–作为电荷补偿剂的效果最好。Ce3+对Tb3+具有明显的敏化作用。结果表明:LiBaPO4:Tb3+是一种适用于白光发光二极管用的绿色荧光材料。Green phosphor LiBaPO4：Tb3＋ for white light emitting diode （LED） was synthesized by the high temperature solid state reaction and its luminescent properties were also investigated. It shows five major emission peaks locate at 436,490,544,587 nm,and 621 nm corresponding to 5D3→7F4,5D4→7F6,5D4→7F5,5D4→7F4,and 5D4→7F3 typical transitions of Tb3＋ respectively. The strongest one appears at 544 nm which emits green light. The excitation spectrum contains weak 4f 75d1 broad band absorption from 220 nm to 280 nm and strong 4f–4f transition absorption （330–390 nm） located at 380 nm,which couples well with the emission of ultravio-let-light-emitting diodes （UV-LED）. Influences of mole fraction （the same below） of Tb3＋ doping on emission intensity were also investigated. The optimum dosage of Tb3＋ is 9%,concentration quenching occurred when Tb3＋ dosage is beyond 9%. Na＋,K＋ and Cl– all can enhance the light emit intensity when used as charge compensations,and Cl– is the most effective one. The sensitization of Ce3＋ on Tb3＋ is obviously. It shows that LiBaPO4：Tb3＋ is a kind of potential green-emitting phosphor for white light emitting diode.

关 键 词：绿色荧光粉 发光特性 白光发光二极管 高温固相法 

分 类 号：O482.31[理学—固体物理]