Highly Efficient and Flexible Scintillation Screen Based on Manganese (II) Activated 2D Perovskite for Planar and Nonplanar High‐Resolution X‐Ray Imaging

Abstract X‐ray imaging technology covers a wide range of applications in the medical, industrial, and scientific research fields. Highly sensitive, flexible, and cost‐effective scintillation screens are of great importance for X‐ray imaging applications. In this paper, manganese (II) activated 2D butylammonium lead bromide perovskite, namely BA 2 PbBr 4 :Mn (II), is demonstrated as a highly efficient and low‐cost X‐ray scintillator. The appropriate amount of Mn (II) dopant can act as an activator for achieving the optimization of luminescence performance through efficient energy transfer. This produces a large Stokes shift thus almost eliminates the effect of self‐absorption. As a result, the optimal BA 2 PbBr 4 :10% Mn (II) perovskite scintillator demonstrates an ultrahigh sensitivity for X‐ray, with a high X‐ray scintillation light yield of up to 85 ± 5 photons keV −1 and low detection limits of 16 nGy air s −1 at the signal‐to‐noise ratio (SNR) of 3. Well‐resolved X‐ray images of several planar and nonplanar objects are obtained using a flexible large‐dimensional scintillation screen fabricated by blade‐coating strategy, featuring high spatial resolution of 10.7 lp mm −1 at modulation transfer function = 0.2. These results indicate that Mn (II) activated BA 2 PbBr 4 perovskite with remarkable scintillation performances can serve as a highly promising scintillator for commercial high‐resolution X‐ray imaging applications.