Mn(II)‐Based Hybrid Halide Ionogel Scintillator Film for Large‐Area and High‐Resolution X‐ray Imaging

Abstract Functionalized ionogels have attracted significant attention in chemical design of new materials and versatile applications, which are formed by polymer network as a matrix with introducing ionic liquids containing characteristic units as a dispersion medium. Here, we present an universal scheme to rapidly synthesize luminescent ionogels through the in situ formation of zero‐dimensional (0D) hybrid metal halides during the polymerization of monomer. In particular, Mn(II)‐based hybrid halide ionogels (Mn─IG) were formed by incorporating [C 20 H 20 P] + cations and [MnBr 4 ] 2− anions into the polymer network structure. Thanks to the amorphous nature of Mn‐IG and the homogeneous distribution of self‐trapped [MnBr 4 ] 2− light‐emitting units with [C 20 H 20 P] + cations, Mn─IG exhibits high transparency (nearly 90% transmittance at 550 nm‐1100 nm) and homogeneous highly‐efficient emission. Taking advantage of its processability, we fabricate an 18 cm × 12 cm scintillation film and successfully realize large‐area and high‐resolution X‐ray imaging. The straightforward and rapid synthesis method on such ionogels paves the way for the low‐process‐demand preparation of large‐area scintillators, and also opens up new routes for the in situ construction of uniform 0D metal halide polymer composites.