首页|Solution-Processed Hybrid Europium(Ⅱ)Iodide Scintillator for Sensitive X-Ray Detection
Solution-Processed Hybrid Europium(Ⅱ)Iodide Scintillator for Sensitive X-Ray Detection
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Lead halide perovskite nanocrystals have recently demonstrated great potential as x-ray scintillators,yet they still suffer toxicity issues,inferior light yield(LY)caused by severe self-absorption.Nontoxic bivalent europium ions(Eu2+)with intrinsically efficient and self-absorption-free d-f transition are a prospective replacement for the toxic Pb2+.Here,we demonstrated solution-processed organic-inorganic hybrid halide BA10Eul12(BA denotes C4H9NH4+)single crystals for the first time.BA10Eul12 was crystallized in a monoclinic space group of P21/c,with photoactive sites of[Eul6]4-octahedra isolated by BA+cations,which exhibited high photoluminescence quantum yield of 72.5％and large Stokes shift of 97 nm.These properties enable an appreciable LY value of 79.6％of LYSO(equivalent to～27,000 photons per MeV)for BA10Eul12.Moreover,BA10Eul12 shows a short excited-state lifetime(151 ns)due to the parity-allowed d-f transition,which boosts the potential of BA10Eul12 for use in real-time dynamic imaging and computer tomography applications.In addition,BA10Eul12 demonstrates a decent linear scintillation response ranging from 9.21 μGyair s-1 to 145 μGyair s-1 and a detection limit as low as 5.83 nGyair s-1.The x-ray imaging measurement was performed using BA10Eul12 polystyrene(PS)composite film as a scintillation screen,which exhibited clear images of objects under x-ray irradiation.The spatial resolution was determined to be 8.95 Ip mm-1 at modulation transfer function=0.2 for BA10Eul12/PS composite scintillation screen.We anticipate that this work will stimulate the exploration of d-f transition lanthanide metal halides for sensitive x-ray scintillators.
School of Microelectronics,Xidian University,Xi'an 710071,China
Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 430074,China
China Optics Valley Laboratory,Wuhan 430074,China
School of Optical and Electronic Information,Huazhong University of Science and Technology,Wuhan 430074,China
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国家重点研发计划国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金Postdoctoral Research Foundation of ChinaFoundation for Innovative Research Groups of Hubei Province of ChinaOpen Project Program of Wuhan National Laboratory for Optoelectronics
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