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)2MnCl4 (Gua = guanidine, CH6N3+) single crystal scintillator grown by a simple solution-processing method is reported. (Gua)2MnCl4 crystallizes into a zero-dimensional (0D) crystal structure consisting of trimeric [Mn3Cl12]6− units. It has a high PLQY of 76% and a large Stokes shift of 125 nm. (Gua)2MnCl4 flexible scintillation screen demonstrates a decent X-ray detection limit of 145.3 nGyair 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.