通过坩埚下降法生长GdI3∶2％Ce及无掺杂GdI3闪烁晶体,得到φ15 mm×20 mm的晶体毛坯,从中加工出尺寸分别为12 mm×10 mm×2.5 mm和11 mm×8 mm×2.5 mm的无包裹体、无开裂的晶体样品,封装后检测该晶体光学性能.XRD分析结果表明:掺杂晶体GdI3∶2％Ce与无掺杂GdI3晶体结构相同.X射线激发发射(XEL)和紫外激发发射谱(PL)测试结果显示:GdI3∶2％Ce晶体在450～700 nm有宽带发光峰,发光峰位分别位于520 nm和550 nm,对应于Ce3+的5d-4f跃迁发光.以550nm为监控波长,测得在紫外激发下存在三个激发峰,分别位于262、335和440 nm.GdI3∶2％Ce晶体在137Cs源伽马射线(662 keV)激发下能量分辨率为3.4％,通过高斯拟合得到的衰减时间为58±3 ns.研究表明,GdI3∶2％Ce晶体是一种良好的伽马和中子探测材料,具有广泛的应用前景.
Gadolinium iodide doped with Cerium (GdI3∶2％Ce) and undoped gadolinium iodide (GdI3) crystals were grown by vertical Bridgman method with sealed quartz crucible.Crystal ingots with dimension of φ15 mm×20 mm were cut and polished to be plates of 12 mm×10 mm×2.5 mm and 11 mm×8 mm×2.5 mm.GdI3∶2％Ce without crack and inclusion were encapsulated for all the measurements.X-ray diffraction analysis shows that the Ce3+-doped GdI3 and undoped GdI3 crystal have the same structure.X-ray and ultraviolet excited luminescence spectra of GdI3∶2％Ce present broad emission bands peaking at 520 nm and 550 nm,respectively,which correspond to 5d-4f transition luminescence of Ce3+.Three peaks located at 262,335 and 440 nm can be observed in excitation spectra when photoluminescence is monitored at 550 nm.The GdI3∶2％Ce crystal presents an excellent energy resolution of 3.4％ and decay time of (58±3) ns under excitation of 662 keV gamma-rays from 137Cs source.The results show the GdI3∶2％Ce crystal is a promising scintillator for gamma ray and neutron detection.
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