CaGa_2O_4:Eu^(3+)红色荧光粉材料发光性能的研究  

Luminescence Properties of CaGa_2O_4:Eu^(3+) Reddish Phosphor

作　　者：叶定华[1] 

机构地区：[1]嘉应学院教育科学学院,广东梅州514015

出　　处：《嘉应学院学报》2016年第5期31-35,共5页Journal of Jiaying University

基　　金：省部产学研引导(2010B090400392)

摘　　要：使用高温固相法制备了CaGa_2O_4:Eu^(3+)红色荧光粉材料,并研究了其物相结构,激发和发射光谱以及能量传递机制.结果表明,CaGa_2O_4:Eu^(3+)荧光粉材料在255 nm的紫外光激发下其发射光谱有两个发射带:1)弱基质的发射介于420~550 nm;2)线状Eu^(3+)的特征发射位于550~750 nm,分别属于Eu^(3+)的~5D_0-~7F_0,~5D_0-~7F_1,~5D_0-~7F_2,~5D_0-~7F_3和~5D_0-~7F_4特征跃迁,其中~5D_0-~7F_2跃迁(617 nm)最强,属于电偶极跃迁,表明掺杂后Eu^(3+)离子占据扭曲的非反演对称中心的格位.Eu^(3+)离子的最佳掺杂浓度为0.04.本实验证明了基质和Eu^(3+)离子间存在能量传递.In this paper,CaGa2O4：Eu^3＋ reddish phosphor has been prepared by the means of high temperature solid state reaction method. The crystalline phase was characterized by the x- ray diffraction meter（ XRD） and photoluminescence（ PL） properties were investigated,and the results show that there exist two strong absorption bands at around 394nm（ ^7F0- ^5L6） and 463nm（ ^7F0- ^5D2）,which are consistent with the output wavelengths of Ga N-based LEDs. The energy transfer between the host and Eu^3＋ has been observed by monitoring the characteristic emission of Eu^3＋ ions under the host absorption at 255 nm. The dominant transition of Eu^3＋ in CaGa2O4：Eu^3＋ is the electric dipole transition ^5D0- ^7F2 with the red emission around 617 nm. The experiment results suggested that the strongest emission was obtained when the concentration of Eu^3＋ is 4 mol%.

关 键 词：发光材料 高温固相法 CaGa2O4:Eu^3+ 能量传递 

分 类 号：O469[理学—凝聚态物理] O433.4[理学—电子物理学]