2D Perovskite Mn 2+ -Doped Cs 2 CdBr 2 Cl 2 Scintillator for Low-Dose High-Resolution X-Ray Imaging.

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, we report the synthesis of a new two-dimensional (2D) perovskite, Cs 2 CdBr 2 Cl 2 , via hydrothermal reaction. By doping Mn 2+ into the perovskite, a yellow emission located at 593 nm was 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 64950 photons MeV -1 and low detection limit of 17.82 nGy air s -1 . Moreover, combing 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. Our study presents a new approach to designing high-performance scintillators through metal ion doping. This article is protected by copyright. All rights reserved.