Ce³⁺掺杂的钾冰晶石结构的卤化物闪烁晶体因具有优异的闪烁性能，得到了广泛的关注。本文采用坩埚下降法成功制备了1英寸高质量Ce³⁺掺杂Cs₂LiLa（Br，Cl）₆闪烁晶体。通过X射线衍射谱、EDS、X 射线光电子谱等手段对Cs₂LiLa（Br，Cl）₆∶Ce晶体的晶体结构和组分进行了分析，结果表明Cl^-成功掺入基质材料后晶体结构未发生明显变化。光致发光荧光光谱、X射线激发发射光谱、紫外荧光衰减等结果表明，Cl^-掺杂后未产生新的发光中心，紫外衰减时间约为28 ns。最后测试了晶体在¹³⁷Cs@662 keV的伽马源和²⁵²Cf源下的能谱，发现晶体具有优异的能量分辨率（4.2%@662 keV）和中子甄别性能（FOM值达到1.9），在核辐射探测领域具有巨大的应用前景。

Because of the excellent scintillation performance, halide scintillation crystals with elpasolite structure doped with Ce³⁺ have been attracted wide attention. In this paper, high-quality Ce³⁺ doped Cs₂LiLa(Br,Cl)₆ scintillation crystal with 1-inch size has been prepared successfully by Bridgman method. The crystal structure and composition of Cs₂LiLa(Br,Cl)₆∶Ce crystals were analyzed by X-ray diffraction, EDS, and X-ray photoelectron spectroscopy. The results show that the Cl^- was successfully introduced into the matrix material and the crystal structure was unchanged. The photoluminescence spectra, X-ray excited emission spectra, and ultraviolet fluorescence decay results show that Cl^- doping did not have a significant effect on luminescence center. It still has a fast decay time of 28 ns. The energy spectra of the crystal were measured under ¹³⁷Cs@662 keV gamma source and ²⁵²Cf source. It was found that the crystal had excellent energy resolution (4.2%@662 keV) and neutron discrimination performance (FOM value is 1.9), which had great application prospects in the field of nuclear radiation detection.