(Gd_(1-x)Y_x)_2Si_2O_7:Ce混晶闪烁体的制备及性能研究  

Synthesis and Performance of (Gd_(1-x)Y_x)_2Si_2O_7: Ce Mixing Crystal Scintillator

作　　者：冯鹤[1] 徐悟生 张志军[1] 徐展[1] 肖丰[1] 赵景泰[1] 

机构地区：[1]上海大学材料科学与工程学院,上海200444 [2]通用电气全球研发中心,上海201203

出　　处：《无机材料学报》2017年第9期931-935,共5页Journal of Inorganic Materials

基　　金：国家自然科学基金青年基金(51402184);上海大学创新基金;上海市高校青年教师资助计划~~

摘　　要：采用固相烧结法制备了(Gd_(1-x)Y_x)_2Si_2O_7:0.1%Ce(x=0.1,0.2,...0.7,1)的系列多晶样品,通过荧光激发发射光谱和X射线激发发射谱对该系列样品进行筛选,发现(Gd_(0.5)Y_(0.5))_2Si_2O_7:0.1%Ce的组分发光效率最高。采用浮区法生长了该组分单晶,并对该单晶的结构、荧光和闪烁性能进行了测试和讨论。XRD结果表明,(Gd_(0.5)Y_(0.5))_2Si_2O_7:0.1%Ce闪烁单晶为正交结构,紫外激发-发射谱、荧光衰减谱显示该晶体的发光主峰位位于362 nm,但由于Gd(~6I_J)→Ce(5d_3)的无辐射能量传递的存在,使样品出现211 ns的荧光慢分量。采用X射线激发发射谱,γ射线激发多道能谱和闪烁衰减谱对样品的闪烁性能进行了表征。结果表明,GYPS:Ce晶体的光产额为Ce掺杂硅酸钇镥标样的90%,由于该无辐射能量传递和较低的Ce掺杂浓度,单晶闪烁发光中存在较长的慢分量,闪烁衰减慢分量成分占到总发光的87%。Polycrystalline samples of （Gd1-xYx）2Si2O7： Ce（x=0.1, 0.2, ...0.7, 1） were prepared through solid state reaction method. The serial samples were screened through scintillation luminescent efficiency i.e. X-ray excited luminescence spectra. The luminescence efficiency of （Gd0.5Y0.5）2Si2O7： 0.1%Ce sample was found to be the highest among all samples. The single crystal with this composition was grown by floating zone method. The structure, photoluminescence and scintillation luminescence properties of as grown sample were measured and discussed. The structure of the as grown single crystal was determined by XRD spectrum. Photoluminescence properties were evaluated in terms of photoluminescence excitation and emission spectra and photoluminescence decay curves. The X-ray excited luminescence spectrum, γ-ray multi-channel energy spectrum and scintillation decay curve were measured. According to the measurement result, the as-grown single crystal had orthorhombic structure. The main luminescence peak is around 362 nm. Two-exponential decay curve with fast component of 30 ns and slow component of 211 ns occurs in the PL process due to the Gd（6IJ）→Ce（5d3） nonradiative energy transfer. Slow component accounts for 87% of the total during the scintillation luminescence, which is resulted from the energy transfer and relative low Ce doping concentration. Light output of the as-grown single crystal sample is 90% of the cerium doped lutetium yttrium silicate scintillator.

关 键 词：闪烁体 闪烁性能 混晶 (Gd0.5Y0.5)2Si2O7 0.1%Ce 

分 类 号：TQ174[化学工程—陶瓷工业]