Lead-free Ce-doped perovskite scintillators with high figure of merit  

作　　者：Xiang Li Haixia Cui Yanxi Zhong Xiaoxi Zhou Shuhong Xu Shujuan Liu Chunlei Wang 

机构地区：[1]Advanced Photonics Center,School of Electronic Science and Engineering,Southeast University,Nanjing 210096,Jiangsu,China [2]State Key Laboratory of Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications,Nanjing 210023,Jiangsu,China [3]Nanjing Foreign Languages School,Nanjing 210008,Jiangsu,China

出　　处：《Journal of Energy Chemistry》2024年第12期74-82,共9页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 22075043, 21875034, 12274075, 62375142)。

摘　　要：Lead halide perovskite scintillators have recently received extensive research attention owing to their short fluorescence lifetimes,low detection limits,and ease of fabrication compared to traditional scintillators.The nontoxic cerium-doped lead-free perovskites with intrinsically efficient and short lifetime d–f transitions are a prospective replacement for the toxic Pb^(2+).Here,we demonstrated Ce-doped cesium lanthanide chloride perovskites (Cs_(3)LnCl_(6),Ln=Gd,Y,Lu) synthesized through a facile solution method for the first time.These perovskites exhibit blue-violet emission,which arises from Ce 5d→4f transitions.Among three types of Cs_(3)LnCl_(6) perovskites,Ce:Cs_(3)LuCl_(6) exhibited high photoluminescence quantum yield (PLQY) of 82%and a short excited-state lifetime of approximately 34 ns.When utilized as X-ray scintillators,Ce:Cs_(3)LuCl_(6) crystals display a high light yield of 8120 photons per MeV and a low detection limit of 36.8 n Gy air s^(-1).Importantly,the figure of merit (FoM),representing the ratio of light yield to decay time,reaches 239,which is the highest reported value for lead-free perovskite scintillators up to now.Additionally,the fabrication of perovskite/PMMA films was undertaken for practical demonstrations in X-ray imaging,resulting in the attainment of a resolution of up to 8.38 lp/mm.We anticipate that this work will inspire the utilization of Ce-doped Cs_(3)LnCl_(6) perovskites in ultrafast scintillation applications such as high-energy physics,nuclear reaction monitoring,and dynamic X-ray imaging.

关 键 词：Lead-free perovskite Short lifetime scintillators X-ray imaging 

分 类 号：TB34[一般工业技术—材料科学与工程]