Gd_2Si_2O_7-Ce_2Si_2O_7体系的相关系及其发光性能  

Solid-Solution Relationship and Luminescence Properties of Gd_2Si_2O_7-Ce_2Si_2O_7 System

作　　者：万欢欢[1] 冯鹤[1] 肖丰[1] 张志军[1] 徐展[1] 赵景泰[1] WAN Huanhuan FENG He XIA O Feng XU Zhan ZHANG Zhijun ZHA O Jingtai(School of Materials Science and Engineering, Shanghai University, Shanghai 200444, Chin)

机构地区：[1]上海大学材料科学与工程学院,上海200444

出　　处：《硅酸盐学报》2017年第1期64-69,共6页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金青年基金(5140218);上海大学创新基金;上海市高校青年教师资助计划项目

摘　　要：对焦硅酸钆-焦硅酸铈(Gd_2Si_2O_7-Ce_2Si_2O_7,GPS-CPS)体系的相关系和光学性能随组分的变化进行了研究,采用固相烧结法制备了系列(Gd_(1-x)Ce_x)_2Si_2O_7(x=0%~100%)多晶样品,通过X射线衍射谱确定样品的结构,通过真空紫外激发发射谱、X射线激发发射谱和荧光衰减谱对样品的光学性能表征。结果表明:纯GPS固相合成的反应路径为Gd_2O_3、SiO_2→GSAP(磷灰石相)→GPS(高温正交相)。随着Ce浓度的增加,GPS:Ce多晶样品呈现正交→三斜→单斜的变化特点:Ce掺杂量在8.00%~10.00%范围时,样品为两相区,正交、三斜相共存。同时,GPS:0.50%Ce样品发光效率最高。GPS:Ce样品的发光过程存在Gd^(3+)→Ce^(3+)的能量传递,导致Ce^(3+)发光中慢分量的出现,且随着Ce浓度的增加,传递效率逐渐降低。The solid-solution behavior and luminescence properties of gadolinium pyrosilicate-cerium pyrosilicate （Gd2Si2O7-Ce2Si2O7,GPS-CPS） system were investigated. A series of cerium doped gadolinium pyrosilicate powders （Gd1-xCex）2Si2O7（x=0%~100%） were obtained by a solid-state synthesis method. The structure of the samples obtained was determined by X-ray diffraction （XRD）. The scintillation and optical properties of GPS：Ce compounds were characterized via vacuum ultraviolet excitation and emission spectra, X-ray excitation luminescence spectra and fluorescence decay curves. The reaction paths of pure GPS at different Ce3＋ concentrations are Gd2O3, SiO2→GSAP （apatite）→GPS （high-temperature orthorhombic）. The structure of GPS-CPS system changes when Ce3＋ concentration increases as the following order, i.e., orthorhombic-triclinic-monoclinic. The two-phase （i.e., orthorhombic and triclinic） region appears in Ce3＋ concentration range from 8% to 10%. The radio-luminescence intensity of GPS：0.5%Ce is the maximum value in the Ce3＋ concentration range of 0.05%-10%. The slow lifetime is attributed to the energy transfer from Gd3＋ to Ce3＋ in GPS：Ce luminescence process. Meanwhile, the energy transfer rate decreases as the cerium doping concentration increases.

关 键 词：焦硅酸钆 焦硅酸铈 相关系 发光性能 闪烁体 

分 类 号：TH145.11[一般工业技术—材料科学与工程]