2D Perovskite Mn<sup>2+</sup>‐Doped Cs<sub>2</sub>CdBr<sub>2</sub>Cl<sub>2</sub> Scintillator for Low‐Dose High‐Resolution X‐ray Imaging
Haiping Xu, Wenqing Liang, Zhizhuan Zhang, Chi Cao, Wensheng Yang, Hongmei Zeng, Zhien Lin, Dewei Zhao, Guohong Zou
Abstract
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, Cs 2 CdBr 2 Cl 2 , via hydrothermal reaction is reported. By doping Mn 2+ into the perovskite, a yellow emission located at 593 nm is obtained, and the photoluminescence quantum yield (PLQY) of Cs 2 CdBr 2 Cl 2 :5%Mn 2+ perovskite reaches the highest value of 98.52%. The near‐unity PLQY and negligible self‐absorption of Cs 2 CdBr 2 Cl 2 :5%Mn 2+ enable excellent X‐ray scintillation performance with a high light yield of 64 950 photons MeV −1 and low detection limit of 17.82 nGy air s −1 . Moreover, combining Cs 2 CdBr 2 Cl 2 :5%Mn 2+ 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 Cs 2 CdBr 2 Cl 2 :5%Mn 2+ 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.