Li_2SrSiO_4:Ce^(3+),Tb^(3+)荧光粉的发光特性及Ce^(3+)→Tb^(3+)的能量传递  

Luminescence Properties and Ce^(3+)→Tb^(3+) Energy Transfer of Li_2SrSiO_4:Ce^(3+),Tb^(3+) Phosphor

作　　者：宋恩海[1] 赵韦人[1] 豆喜华[1] 易春雨 周民康 

机构地区：[1]广东工业大学物理与光电工程学院,广东广州510006 [2]惠州市纯英半导体照明科技有限公司,广东惠州516006

出　　处：《中国稀土学报》2012年第1期41-46,共6页Journal of the Chinese Society of Rare Earths

基　　金：广东省创新基金项目(09C26214405227);惠州市产学研结合项目(2009B010004008)资助

摘　　要：用固相反应法合成了具有单相的Li2EuSiO4结构的Li2Sr1-x-ySiO4:xCe3+,yTb3+系列样品。荧光光谱研究表明,Li2SrSiO4:Ce3+发射很强的蓝光,最强的激发峰位于360 nm;而Li2SrSiO4:Tb3+发射很强的绿光,最强的激发激发峰位于243 nm,但在350～410 nm的激发非常微弱。在Ce3+,Tb3+共掺杂的样品Li2Sr0.99-ySiO4:0.01Ce3+,yTb3+中,观察到Ce3+对Tb3+的共振能量传递。由于Ce3+对Tb3+能量传递,Tb3+的激发光谱中出现360 nm附近的宽激发峰。控制Tb3+/Ce3+掺杂浓度比可以实现绿蓝双基色的调制。这种双基色的荧光粉有望在紫外激发的白光LED中获得应用。Li2Sr1-x-ySiO4：xCe3＋,yTb3＋ phosphors with single Li2EuSiO4 phase structure were synthesized by high temperature solid state reaction.The fluorescence spectra showed that Ce3＋ doped Li2SrSiO4 phosphors emitted strong blue fluorescence with the exciting peak located at 360 nm,while Tb3＋ doped Li2SrSiO4 phosphors emitted strong green light with the exciting peak at 243 nm and no exciting peak exited in the range of 350~410 nm.A resonant energy transfer from Ce3＋ to Tb3＋ was observed and a wide exciting spectrum with peak at 360 nm appeared for Ce3＋ and Tb3＋ co-doped Li2SrSiO4.The bicolor of blue and green could be tuned by adjusting the relative content of Ce3＋ and Tb3＋.The bicolor phosphors have the potential application for white LEDs based on UV/NUV chip. 更多

关 键 词：硅酸盐 荧光 能量传递 双基色 稀土 

分 类 号：O482.31[理学—固体物理]