One‐Step Synthesis of Recyclable 0D Hybrid Mn(II)‐Based Halide Scintillator for X‐Ray Imaging

Abstract 0D organic‐inorganic hybrid metal halides (OIHMHs) are renowned as promising candidates for the next‐generation X‐ray scintillators due to their intense radioluminescence and eco‐friendliness. However, the conventional solution‐processing method for synthesizing OIHMHs is not amenable to large‐scale production, hindering their widespread application. In this study, a highly efficient and recyclable X‐ray scintillator based on 0D OIHMHs, (EDMIM) 2 MnBr 4 (EDMIM = C 7 H 13 N 2 ), which can be produced on a large‐scale using one‐step synthesis process, is introduced. The as‐synthesized (EDMIM) 2 MnBr 4 exhibits a bright green emission peaking at 532 nm, with a remarkable photoluminescence quantum yield (PLQY) of 92.49%. The corresponding X‐ray scintillator perform an excellent linear response to X‐ray dose rates, a light yield of 58,843 photons MeV −1 and a low detection limit of 93 nGy s −1 . By employing a spatially confined solution‐processing strategy combined with a gradient cooling technique, a scintillation screen achieving an ultra‐high spatial resolution of 19.3 lp mm −1 is fabricated. Furthermore, the outstanding thermoplastic recyclability of (EDMIM) 2 MnBr 4 enables its reuse in X‐ray imaging. This work not only offers a novel approach to the facile large‐scale fabrication of high‐performance metal halide scintillators, but also significantly advances the development of recyclable X‐ray scintillators for X‐ray imaging applications.