微波场作用下Gd2O2S：Tb绿色荧光粉的快速合成及其发光特性  

Rapid synthesis of Gd2O2S：Tb green-emitting phosphor by the microwave radiation method and its luminescent properties

作　　者：仇满德[1] 姚子华[1] 刘元红[1] 翟永清[1] 徐密娟[1] 

机构地区：[1]河北大学化学与环境科学学院,河北保定071002

出　　处：《功能材料》2007年第A01期226-229,共4页Journal of Functional Materials

基　　金：基金项目：国家自然科学基金资助项目（20675023）;河北省科学技术研究与发展计划基金资助项目（06213015）;河北大学研究基金资助项目（y2004024）

摘　　要：首次采用微波法，快速合成了Gd2O2S：Tb绿色荧光粉，用X射线粉末衍射（XgD）、扫描电镜（SEM）、荧光分光光度计等对合成产物的结构、形貌、以及发光特性进行了研究。结果表明，材料的晶体结构为六方晶系，与Gd2O2S的相同,颗粒的形貌为类球形，分散性很好，尺寸在1μm左右,Gd2O2S：Tb的激发光谱呈带状，主峰位于298nm,发射光谱由384、418、439、471、498、547、590、624nm的一系列窄带发射峰组成，归属于Tb^3＋从^5D4、^5D3能级到^7FJ（J=0-6）的跃迁。主发射峰位于547nm，对应于^5D4→^7F5的能级跃迁，导致一种绿光发射,研究发现Tb的掺杂浓度对样品主发射峰的强度有着很重要的影响，在5％（摩尔分数）时达到最大，继续增加Tb的浓度，出现浓度猝灭现象，同时对浓度猝灭的机理进行了探讨。Gd2O2S：Tb green-emitting phosphor was firstly synthesized in microwave field. The properties of the synthesized Gd2O2S：Tb were investigated respectively by X-ray diffraction, SEM, fluorescence spectrophotometer. The results show that Gd2O2S：Tb phosphor possesses hexagonal crystal structure, which is similar to that of Gd2O2S. The particles of phosphor are basically spherical in shape and dispersing well. The mean particle size is about 1μm. The excitation spectrum is a broad band and the main peak is at 295nm. The emission spectrum is composed by a series of sharp peaks at 384, 418, 439, 471,498, 547, 590 and 624nm. These emission peaks are ascribed to Tb^3＋ ions transition from ^5D4, ^5D3 to ^7Fj （J=0-6）. The main emission peak is at 547nm（^5D4→^7F5）, which results in a green-emitting. It is found that Tb^3＋ concentration has significant effect on luminescence intensity of Gd2O2S：Tb. When Tb^3＋ concentration is 5mol%, the green emitting becomes strongest. Further increasing Tb^3＋ concentration leads to luminescence intensity decrease. Moreover, the mechanism of the concentration quenching of the ^5D4 and ^5D3 state is discussed. The concentration quenching of the ^5D3 state is governed by dipole-dipole interaction, while that of the ^5D4 state by exchange interaction.

关 键 词：Gd2O2S:Tb 微波法 发光 浓度猝灭 

分 类 号：O482.31[理学—固体物理]