大尺寸PWO:(Sb,Y)晶体光谱特性的表征研究

Characterization on the Optical Properties of Large PbWO_4:(Sb,Y) Crystal

报道了用改进的Bridgmam法生长的大尺寸PbWO4:(Sb,Y)晶体的光谱特性的表征研究.通过对依次切自大尺寸PbWO4:(Sb,Y)毛坯晶体的籽晶端、中间部位和顶端三块晶体(-23mm×23mm×20mm)的透射光谱、X射线激发发射光谱、紫外激发与发射光谱、发光衰减寿命、光产额和辐照损伤等方面的光谱性能测试,结果表明,Sb、Y双掺杂能显著改善PbWO4晶体的光谱性能,使晶体在短波330-420nm范围的透过率明显提高,光产额增加,抗辐照能力增强.但从籽晶端到顶端的性能存在一定的差异,说明大尺寸的PbWO4:(Sb,Y)晶体的均匀性还有待提高.

This paper presents the characterization and investigation of the optical properties on doubly-doped large PbWO4：（Sb,Y） crystals grown by the modified Bridgman method. Based on the comparison measurement of the optical transmission spectra, X-ray excited luminescence, photoluminescence, decay time, light yield and irradiation damage for 23mm × 23mm × 20mm crystal samples cut from seed end, middle part and top end of a large PbWO4：（Sb,Y） crystal ingot, the results show that co-doping Sb and Y can significantly improve the light yield, radiation hardness and other spectroscopic properties of PbWO4 crystal. However, the uniformity of large PbWO4：（Sb,Y） crystal needs to be further improved based on the comparison of measurement results.