2D Perovskite Mn2+‐Doped Cs2CdBr2Cl2 Scintillator for Low‐Dose High‐Resolution X‐ray Imaging

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Abstract
High‐performance X‐ray scintillators with low detection limits and high light yield are of great importance and are a challenge for low‐dose X‐ray imaging in medical diagnosis and industrial detection. In this work, the synthesis of a new 2D perovskite, Cs2CdBr2Cl2, via hydrothermal reaction is reported. By doping Mn2+ into the perovskite, a yellow emission located at 593 nm is obtained, and the photoluminescence quantum yield (PLQY) of Cs2CdBr2Cl2:5%Mn2+ perovskite reaches the highest value of 98.52%. The near‐unity PLQY and negligible self‐absorption of Cs2CdBr2Cl2:5%Mn2+ enable excellent X‐ray scintillation performance with a high light yield of 64 950 photons MeV−1 and low detection limit of 17.82 nGyair s−1. Moreover, combining Cs2CdBr2Cl2:5%Mn2+ with poly(dimethylsiloxane) to fabricate a flexible scintillator screen achieves low‐dose X‐ray imaging with a high resolution of 12.3 line pairs (lp) mm−1. The results suggest that Cs2CdBr2Cl2:5%Mn2+ is a promising candidate for low‐dose and high‐resolution X‐ray imaging. The study presents a new approach to designing high‐performance scintillators through metal‐ion doping.
Funding Information
  • National Natural Science Foundation of China (22122106, 22071158, 21971171)
  • Fundamental Research Funds for the Central Universities (YJ201955)

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