通过区熔法获得了铈掺杂焦硅酸钇闪烁单晶(Y2Si2O7:Ce3+, 简写为YPS), 并对其闪烁与热释光性能进行了研究. 对YPS:Ce闪烁晶体的透过、光输出和光衰减等光学和闪烁性能进行了表征, 并对其综合性能进行了评价.其衰减时间为30.16ns, 为目前铈掺杂焦硅酸盐闪烁晶体中最快的. 并采用热释光测试技术, 对YPS:Ce晶体中的缺陷进行了研究, 发现在300~500K温度区间内一共有三个热释光峰, 分别对应于三个缺陷,通过对二维(温度?光强) 的拟合, 确定了这三种缺陷的陷阱深度、振动频率等物理参数. 并结合三维(温度-波长-光强)热释光谱, 提出了YPS:Ce的热释光模型.
Cerium doped yttrium pyrosilicate Y2Si2O7:Ce(YPS) single crystal was obtained through the floating zone method. The scintillation and thermoluminescence (TL) properties of YPS:Ce were studied. The scintillation and optical properties of YPS:Ce crystal were characterized by light output, decay time and transmittance. Its potential application prospect as scintillation material was also evaluated. It was noticed that the decay time of YPS:Ce was about 30.16 ns, which was the fastest value in the cerium doped silicate scintillators. The traps in YPS:Ce were studied through TL spectrum. Three traps were detected in the temperature range of 300-500 K, corresponding to three trap in YPS:Ce sample. The physical parameters of these traps (including energy level, frequency factor) were determined through fitting the 2D (temperature-luminescence intensity) TL curve. Combined with 3D (temperature- wavelength-luminescence intensity) TL spectra, the TL mode of YPS:Ce sample was proposed.
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