近紫外LED激发荧光粉Ba_(0.11)Sr_(2.89-2x)Ce_xNa_xAlO_4F发光特性  

Luminescence of Ce^(3+) Activated Phosphors Ba_(0.11)Sr_(2.89-2x)Ce_xNa_xAlO_4F under Near Ultra-Violet LED Excitation

作　　者：黄奇书[1] 倪海勇[2] 张秋红[2] 王灵利[2] 李许波[1] 丁建红[1] 

机构地区：[1]广州有色金属研究院稀有金属科技公司,广东广州510650 [2]广州有色金属研究院稀有金属研究所,广东广州510650

出　　处：《中国稀土学报》2013年第5期547-553,共7页Journal of the Chinese Society of Rare Earths

基　　金：广州市珠江科技新星(2011J2200034);广东省战略新兴产业项目(粤财工[2010]633号))资助

摘　　要：采用高温固相法反应制备Ba0.11Sr2.89-2x Ce x Na x AlO4F(x=0.01,0.02,0.05,0.07,0.10,0.15)荧光粉。Ba0.11Sr2.89AlO4F体系中存在Sr(1)2+和Sr2+(2)两个格位。Sr2+(1)离子位于Wyck.4a格位,为十配位多面体构型。Sr2+(2)离子位于Wyck.8h格位,为八配位的多面体构型。研究了Ba0.11Sr2.89-2x Ce x Na x AlO4F荧光粉的紫外-可见激发、发射光谱、荧光寿命及能量传递过程,讨论并指认了Ce3+在上述两个格位中的激发带位置及能级重心,发射光谱曲线分别由两个~463,~505和~550 nm宽带发射构成。随着Ce3+浓度增加,长波发射~550 nm逐渐增强,而色品坐标(x=0.199,y=0.351)蓝绿区逐渐变化到黄绿区域(x=0.389,y=0.489)。The phosphors, Ce3＋ doped strontium oxy- fluoride aluminate phosphors Bao. 11 Sr2. s9 -2x CexNGA104F（x =0.01, 0.02, 0.05, 0.07, 0.10, 0.15 ） were prepared through a high-temperature sol- id-state reaction technique. There are two Sr2＋ lattice sites in Ba0.11Sr2.s9A104F, denoted Sr2＋ （ 1 ） and Sr2＋ （2）. The Sr2＋（1） ions at Wyck. 2a sites are with 10-fold distorted polyhedron configuration. Sr2＋ （2） ions at Wyck. 8h sites are with 8-fold polyhedron con- figuration. The UV-vis excitation, emission spectra, decay curves and energy transfer process of phosphors Ba0.11Sr2. s9 -2x Cex NaxA104 F were investigated, the ori- gin of these 4f-Sd excitation bands and the 5d centroid of Ce3~ in two sites were assigned and discussed. The emission spectra of phosphors Ba0. u Sr/.s9.zx CexNaxA1OaF are composed of broad band at -463, 505 and 550 nm, respectively, and the relative intensity of Ce3＋ emission at -550 nm increases and chromaticity coordinates of phosphors could be varied from blue-green （x = 0. 199, green （x =0. 199, y =0.351） concentration. y = 0. 351 ） to yellow- with increasing of Ce3~

关 键 词：Ba0.11Sr2.89AlO4F 荧光粉 LED 发光 Ce3+ 

分 类 号：O482.31[理学—固体物理]