Isopropanol Addition-Assisted Large-Area Synthesis of Mn-Based Hybrid Scintillation Film for X-ray Imaging

Hybrid metal halide scintillation films have emerged as promising candidates for X-ray imaging. However, current film fabrication methods generally rely on the blending of halide microcrystal scintillators with polymers, which results in serious light scattering. Therefore, designing and synthesizing large-area uniform films to enhance optical performance remain a challenge. Herein, we employ isopropanol (IPA) to reduce surface tension to facilitate uniform film formation and simultaneously lower solvent polarity to decrease solute solubility, thereby accelerating supersaturation and providing the driving force for crystallization during evaporation, which provides a strategy for fabricating large-area uniform films on a glass substrate. As a representative, (TPA)2MnBr4 (TPA = [(C3H7)3NH]+ (tri-n-propyl-ammonium)) film modified by IPA addition demonstrates a remarkable near-unity photoluminescence quantum yield, achieving a high light yield of 51,000 Ph MeV–1 and a low detection limit of 37.7 nGy s–1. The uniform scintillation film exhibits impressive transparency (>80%), contributing to high-resolution X-ray imaging with a spatial resolution of 21 lp mm–1. These findings provide a design concept for high-quality scintillation films with excellent performance for X-ray imaging.