硅酸盐学报

Gd2Si2O–Ce2Si2O7体系的相关系及其发光性能

作者：万欢欢冯鹤式肖丰张志军徐展赵景泰

单位：上海大学材料科学与工程学院上海 200444

分类号：TH145.1+1

出版年,卷(期):页码：2017,45(1):64-69

DOI：10.14062/j.issn.0454-5648.2017.01.09

摘要：

对焦硅酸钆?焦硅酸铈(Gd2Si2O7–Ce2Si2O7,GPS–CPS)体系的相关系和光学性能随组分的变化进行了研究，通过固相烧结法制备了系列(Gd1–xCex)2Si2O7(x=0％~100%)多晶样品，样品的结构通过X射线衍射谱确定，光学性能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进行了表征。结果表明：纯GPS固相合成的反应路径为Gd2O3、SiO2→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%~10%范围时，样品为两相区，正交、三斜相共存。同时，GPS:0.5%Ce样品发光效率最高。GPS:Ce样品的发光过程存在Gd3+→Ce3+的能量传递，导致Ce3+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.

基金项目：

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

作者简介：

万欢欢(1990—)，女，硕士研究生

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