首页|Lead-free Ce-doped perovskite scintillators with high figure of merit
Lead-free Ce-doped perovskite scintillators with high figure of merit
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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 scintil-lators.The nontoxic cerium-doped lead-free perovskites with intrinsically efficient and short lifetime d-f transitions are a prospective replacement for the toxic Pb2+.Here,we demonstrated Ce-doped cesium lanthanide chloride perovskites(Cs3LnCl6,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 transi-tions.Among three types of Cs3LnCl6 perovskites,Ce:Cs3LuCl6 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:Cs3LuCl6 crystals display a high light yield of 8120 photons per MeV and a low detection limit of 36.8 nGy 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 scin-tillators 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 Cs3LnCl6 perovskites in ultrafast scintillation applications such as high-energy physics,nuclear reaction monitoring,and dynamic X-ray imaging.
Xiang Li、Haixia Cui、Yanxi Zhong、Xiaoxi Zhou、Shuhong Xu、Shujuan Liu、Chunlei Wang
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Advanced Photonics Center,School of Electronic Science and Engineering,Southeast University,Nanjing 210096,Jiangsu,China
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
Nanjing Foreign Languages School,Nanjing 210008,Jiangsu,China
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