Red‐Emitting Organic–Inorganic Hybrid Manganese(II) Halides for X‐Ray Imaging

Abstract Low‐dimensional organic–inorganic hybrid manganese(II) halides are emerging as a highly promising class of candidate materials for X‐ray imaging due to their excellent radioluminescence performance. Here, a red‐emitting (Gua) 2 MnCl 4 (Gua = guanidine, CH 6 N 3 + ) single crystal scintillator grown by a simple solution‐processing method is reported. (Gua) 2 MnCl 4 crystallizes into a zero‐dimensional (0D) crystal structure consisting of trimeric [Mn 3 Cl 12 ] 6− units. It has a high PLQY of 76% and a large Stokes shift of 125 nm. (Gua) 2 MnCl 4 flexible scintillation screen demonstrates a decent X‐ray detection limit of 145.3 nGy air s −1 and a superior imaging resolution of 8 lp mm −1 . These results highlight the potential of low‐dimensional red‐emitting Mn‐based hybrids for X‐ray imaging applications.