红外与毫米波学报, 2009, 28 (4): 263, 网络出版: 2010-12-13   

掺杂钨酸铅闪烁晶体的闪烁光学性质研究

STUDY ON THE SCINTILLATING PROPERTIES OF IONS DOPED LEAD TUNGSTATE SCINTILLATION CRYSTALS
作者单位
1 嘉兴学院 先进材料研究所, 浙江 嘉兴 314001
2 云南师范大学 可再生能源材料先进技术与制备教育部重点实验室, 云南 昆明 650092
3 浙江大学 材料与化工学院无机材料研究所, 浙江 杭州 300200
摘要
利用多坩埚温度梯度法生长了PbWO4 和BaF 2 :PbWO 4 晶体, 研究了PbWO 4 、退火PbWO 4 和BaF 2 :PbWO 4 晶体 的透过光谱和X射线激发光谱, 结果发现这些光谱性质与晶体的组成和生长工艺密切相关, 其中退火的影响较复 杂.高温退火的PbWO 4 晶体的透过光谱在360nm以上波段有较好的透过率, 但是在320~360nm波段透过率反而略 有降低;380nm以上波段的X射线激发光谱光谱强度较高, 320~380nm波段光谱强度却略有降低.掺杂的离子改 善了晶体的透过率和X射线激发发光光谱强度.利用晶体的生长工艺和组成与缺陷以及晶体光学性质之间的关系 解释了这些现象产生的原因.BaF 2 :PbWO 4 掺杂晶体的X射线激发光谱的波形和发光峰强度均发生了很大程度的 改变, 与F 离子掺杂引发晶体[WO 4 ] 2四面体基团畸变而产生的新的发光中心有关.
Abstract
PbWO 4 and BaF 2 :PbWO 4 were grown by multi-crucible temperature gradient system. The transmittance spectra and x-ray excited luminescence spectra of as-grown PbWO 4 , annealed PbWO 4 and annealed BaF 2 :PbWO 4 were studied. The results reveal that these properties are related to the composition and growth arts of the crystals. The facts are complicated for the crystals annealing. In the wavelength range above 360nm, the transmittance for the annealed crystal is better than that of the as-grown crystal, while it is a little weaker than that of the as-grown crystal in the wavelength range of 320 ~360nm. For the x-ray excited luminescence spectra, the spectrum intensity of the annealed crystal is higher than that of as-grown crystal in the wavelength range above 380nm, while it is a little weaker than that of as-grown crystal in the wavelength range of 320~380nm. The doping ions improve the transmittance and the x-ray excited luminescence spectrum intensity. These phenomena are explained based on the relations of the defect, crystal growth arts and the optical properties of these crystals. For the BaF 2 :PbWO 4 crystal, it's peak shape and intensity of x-ray excited luminescence spectrum are evidently changed than PbWO4 crystal. The phenomenon may relate to the fact that [WO 4 ] 2tetrahedron of the crystal is degenerated when it is doped with F ions, and the degeneration will induce a new luminescent center.

万尤宝, 吴宇容, 张建新, 杨培志, 肖林荣, 杨辉. 掺杂钨酸铅闪烁晶体的闪烁光学性质研究[J]. 红外与毫米波学报, 2009, 28(4): 263. WAN You-Bao, WU Yu-Rong, ZHANG Jian-Xin, YANG Pei-Zhi, XIAO Lin-Rong, YANG Hui. STUDY ON THE SCINTILLATING PROPERTIES OF IONS DOPED LEAD TUNGSTATE SCINTILLATION CRYSTALS[J]. Journal of Infrared and Millimeter Waves, 2009, 28(4): 263.

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