近紫外光激发的新型蓝色荧光粉SrZnO2：Bi^3＋的合成与发光性能  

Synthesis and luminescent performance of near UV excitable SrZnO2：Bi^3＋ novel blue-emitting phosphor

作　　者：贺香红[1] 周健[1] 李卫华[1] 周全法[1] 

机构地区：[1]江苏技术师范学院化学化工学院江苏省贵金属深加工技术及应用重点建设实验室,江苏常州213001

出　　处：《功能材料》2007年第A01期110-113,共4页Journal of Functional Materials

基　　金：基金项目：江苏高校高新技术产业发展基金资助项目（JHB05-52）

摘　　要：采用柠檬酸溶胶．凝胶法合成了SrZnO2：Bi^3＋和SrZnO2：Bi^3＋，M^＋（M=Li，Na，K）新型蓝色荧光粉。通过X射线粉末衍射、紫外-可见吸收光谱以及荧光光谱对样品进行了表征。结果表明，其激发谱是由位于250、365nm处的两个宽峰组成，该样品能有效吸收近紫外光。在不同波长的紫外光激发下，样品都发出较强的蓝色荧光，发射谱的峰形和峰位基本相同，最大峰位在455nm附近。SrZnO2基质中Bi^3＋的最佳掺杂浓度较低，仅为1．40％。共掺杂碱金属离子既能增强SrZnO2：Bi^3＋荧光体的激发和发射强度，也可以导致激发峰的劈裂。其中以共掺Li^＋离子的效果最好,SrZnO2：Bi^3＋，Li^＋能有效地吸收365-400nm的近紫外光，发射出较强的蓝光，是一种新型白光发光二极管用蓝色荧光粉。A series of novel luminescent powders, SrZnO2：Bi^3＋ and SrZnO2：Bi^3＋, M^＋（M=Li,Na,K） near UV excitable phosphors, were synthesized by citrate sol-gel method. The structure and luminescence properties of SrZnO2：Bi^3＋,M^＋（M= Li,Na,K） phosphor were studied through x-ray powder diffraction （XRD）, photoluminescence and UV-vis spectrum. The excitation spectrum consists of two broad band peaked at 250 and 365 nm, corresponding to ^1s0→^1p1 and ^1s0→^3p1 transition of Bi^3＋ respectively. The emission spectrum of SrZnO2：Bi^3＋ shows a very broad band extending from 400 to 600 nm with a maximum at -455nm which was ascribed to the ^3p1→^1s0 transition of the Bi^3＋ ions allowed by the strong spin-orbit coupling. The optimum activator concentration was found to be about 1.4mol% relative to SrZnO2 host. The excitation and luminescence of SrZnO2：Bi^3＋ phosphor can be significantly enhanced by co-doped with Bi^3＋ and alkali metal ions Li^＋, Na^＋ or K^＋, especially for Li^＋ with smallest ion radium among them, probably due to the charge compensation mechanism. Furthermore, the incorporation of alkali metal ions into SrZnO2 host results in the splitting of excitation peaks. The as-prepared SrZnO2：Bi^3＋,Lit powder which exhibits blue-emitting under long-wavelength UV radiation, may be a potential phosphor for white LEDs lighting.

关 键 词：SrZnO2:Bi^3+ 蓝色荧光粉 发光性能 柠檬酸溶胶-凝胶法 近紫外光激发 

分 类 号：O614.53[理学—无机化学] TN104.3[理学—化学]