硅酸盐学报

Gd2Si2O7 –Ce2Si2O7体系的相关系及其发光性能

作者：万欢欢冯鹤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

关键词：焦硅酸钆焦硅酸铈相关系发光性能闪烁体

分类号：TH145.1+1

出版年,卷(期):页码：2017,45(1):0-0

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，采用固相烧结法制备了系列(Gd1–xCex)2Si2O7(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8.00%~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 8.00% to 10.00%. The radio-luminescence intensity of GPS:0.50%Ce is the maximum value in the Ce3+ concentration range of 0.05%–10.00%. 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。

参考文献：

[1] KAWAMURA S, KANEKO J H, HIGUCHI M, et al. Floating zone growth and scintillation characteristics of cerium-doped gadolinium pyrosilicate single crystals[J]. IEEE Trans Nucl Sci, 2007, 54(4): 1383–1386.
[2] KAWAMURA S, KANEKO J H, HIGUCHI M, et al. Investigation of Ce-doped Gd2Si2O7 as a scintillator material[J]. Nucl Instrum Methods Phys Res Sect A, 2007, 583(2): 356–359.
[3] TSUBOTA Y, KANEKO J H, HIGUCHi M, et al. High-temperature scintillation properties of orthorhombic Gd2Si2O7 aiming at well logging[J]. Appl Phys Exp, 2015, 8 (6): 062602(1–4).
[4] FENG H, DING D Z, LI H Y, et al. Cerium concentration and temperature dependence of the luminescence of Lu2Si2O7:Ce scintillator[J]. J Alloy Compd, 2011, 509 (9): 3855–3858.
[5] TOROPOV N A, GALAKHOV F Y, KONOVALOVA S F. Silicates of
the rare earth elements[J]. Bull Acad Sci USSR, Div Chem Sci, 1961, 10 (4): 497–501.
[6] KAWAMURA S, HIGUCHI M, KANEKO J H, et al. Phase Relations around the pyrosilicate phase in the Gd2O3–Ce2O3–SiO2 system[J]. Cryst Growth Des, 2009, 9(3): 1470–1473..
[7] FELSCHE J. The Crystal Chemistry of the Rare-earth Silicates [M]. Berlin Heidelberg: Springer, 1973, 13: 99–197.
[8] KAWAMURA S, KANEKO J H, HIGUCHI M, et al. Scintillation characteristics of Ce:Gd2Si2O7(Ce 2.5 mol%–30　mol%) single crystals prepared by the floating zone method[J]. IEEE Trans Nucl Sci, 2009, 56(1): 328–330.
[9] SHINDE S, PITALE S, SINGH S G, et al. Structural and luminescence properties of Gd2Si2O7:Ce prepared by solution combustion followed by heat treatment[J]. J Alloy Compd, 2015, 630: 68–73.
[10] MAIERA N, RIXECKERB G, NICKEL K G. Properties and crystallization of rare-earth Si–Al–O–N glasses containing mixed trivalent modifiers[J]. J Am Ceram Soc, 2005, 88(4): 875–881.
[11] MAIERA N, RIXECKERB G, NICKEL K G. Formation and stability of Gd, Y, Yb and Lu disilicates and their solid solutions[J]. J Solids State Chem, 2006, 179 (6): 1630–1635.
[12] FENG H, XU W, REN G, et al. Optical, scintillation properties and defect study of Gd2Si2O7: Ce single crystal grown by floating zone method[J]. Phys B: Condens Matter, 2013, 411: 114–117.
[13] SUZUKI H, TOMBRELLO T A, MELCHER C L, et al. The role of gadolinium in the scintillation processes of cerium-doped gadolinium oxyorthosilicate[J]. Nucl Instru Meth Phys A, 1994, 346(3): 510–521.

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