n/γ双读出闪烁晶体Cs2LiLaBr6:Ce（CLLB:Ce）具有光输出高、衰减时间快、能量分辨率优、α/β高等优点，而且光输出均一性和温度依赖性极佳，综合性能优异、应用前景明确，然而生长高光学质量CLLB:Ce单晶困难，疑因CLLB非一致熔融导致多晶失透，但目前缺乏包含CLLB相的二元或者三元相图，结晶行为尚不明晰，晶体生长得不到科学的理论指导。本项目立足应用需求、以期突破瓶颈，拟以CLLB:Ce为研究对象，研究晶体生长中遇到的核心基础科学问题：包含CLLB相的二元相图的绘制和CLLB的结晶行为，从而进行CLLB:Ce晶体的组分设计、生长优化，制备大尺寸、高光学质量的CLLB:Ce晶体，研究其组分分布与光学性能、双读出性能的关系，为CLLB:Ce等冰晶石型闪烁晶体生长奠定坚实的基础，以期为中子探测技术装备的开发与产业发展贡献关键的高端材料。

Cs2LiLaBr6:Ce (CLLB:Ce) is a comprehensively excellent potential n/γ dual readout scintillation crystal with high light output, fast decay time, excellent energy resolution and high α/β ratio as well as excellent light output uniformity and temperature dependence. However, it is difficult to grow high optical quality CLLB:Ce single crystals. It is suspected that CLLB is so incongruent as to polycrystalline, but there is no binary or ternary phase diagram including CLLB compound at present, and the crystallization behavior of CLLB is not clear, so that the crystal growth of CLLB cannot be guided by reasonable theory. Based on the application requirement and the wish to break through the bottleneck, in this project CLLB:Ce will be taken as the research object, and the core basic academic question is investigated, which is to draw binary phase diagram including CLLB phase and disclose crystallization behavior of CLLB, encountered in crystal growth. Then to design the composition and optimize the growth process of CLLB:Ce crystals, prepare large-sized and high-quality CLLB:Ce crystals, and study the relationship between composition distribution and optical properties and dual readout performance, are performed afterwards. Consequently the project lead to solid foundation for the growth of Elpasolite scintillation crystals such as CLLB:Ce, as well as contributing materials for the development of neutron detection technological equipment and high-tech industry.