人工晶体学报2026，Vol.55Issue(2)：201-210,10.DOI:10.16553/j.cnki.issn1000-985x.2025.0192
Sm2+-Ce3+共掺CLLB闪烁晶体生长及发光性能研究
Growth and Luminescence Properties of Sm2+-Ce3+Co-Doped CLLB Scintillation Crystals
摘要
Abstract
Due to the better matched with the spectral response of silicon-based photodetectors,offering a promising route toward compact,highly sensitive radiation detection,the near infrared scintillators have attracted much interest.The Sm2+activated halide scintillators with emission wavelength of 700 nm to 900 nm have been developed.However,the strategy of single Sm2+doping have some disadvantage of low light out and worse energy resolution.Usually,the co-doping is an effect method to improve the scintillation properties by adjusting the energy transfer efficiency,defect structure and quantity. In this work,the Cs2LiLaBr6:Ce3+with excellent scintillation properties is chosen as a host,and the Sm2+is introduced as a near infrared emitting center to construct an energy transfer route from Ce3+to Sm2+.Cs2LiLaBr6:Ce3+,Sm2+single crystals with varied Sm2+concentrations were successfully grown by the vertical Bridgman method.The axial distribution and segregation behavior of Sm2+were quantitatively evaluated using ICP-MS,yielding an effective segregation coefficient of about 2.0,which indicates a pronounced tendency of Sm enrichment during crystal growth.Optical properties and energy transfer were investigated by steady state photoluminescence,time resolved decay measurements,and photoluminescence quantum yield.In addition,X-ray excited luminescence and thermoluminescence were employed to probe defect related trapping and radiative processes. The co-doped crystals exhibit three characteristic emission bands centered at approximately 390,420 and 770 nm.The two visible bands originate from Ce3+5d to 4f transitions,while the near infrared band is assigned to Sm2+5d-4f emission,demonstrating successful introduction of near infrared luminescence for the Cs2LiLaBr6 matrix.The spectral overlap between Ce3+emission and Sm2+excitation is observed,together with the evolution of decay dynamics,provide strong evidence for energy transfer from Ce3+to Sm2+.Notably,a number of energies are loss during the energy transfer pathway of Ce-Sm,implying the presence of competing nonradiative channels and trap assisted dissipation.The photoluminescence quantum yield increased firstly and then decreased as Sm2+concentration raised.It reaches a maximum value of about 98.5％when the Sm2+concentration is 3％.The concentration quenching is happened for the higher doping concentration.Thermoluminescence and X-ray excited luminescence further reveal that the Sm2+co-doping reconstructs the defect energy of the host,altering the trap depth and recombination pathways. Overall,this study establishes a systematic design and characterization framework for Ce3+sensitized Sm2+near infrared emission in the Cs2LiLaBr6 host,provides quantitative insight into dopant segregation,and clarifies the coupled roles of energy transfer losses and defect evolution.These findings offer practical guidance for optimizing near infrared halide scintillators intended for silicon-based readout and advanced radiation detection applications.关键词
Sm2+掺杂/Cs2LiLaBr6:Ce3+,Sm2+/垂直布里奇曼法/能量传递/闪烁晶体/发光性能Key words
Sm2+ doping/Cs2LiLaBr6:Ce3+,Sm2+/vertical Bridgman method/energy transfer/scintillation crystal/luminescence property分类
数理科学引用本文复制引用
王浩涵,魏钦华,舒昶,尹航,唐高,张素银,秦来顺..Sm2+-Ce3+共掺CLLB闪烁晶体生长及发光性能研究[J].人工晶体学报,2026,55(2):201-210,10.基金项目
国家自然科学基金(12275262) （12275262）
浙江省自然科学基金(LZ23E020001) （LZ23E020001）
