In Situ Preparation of High‐Quality Flexible Manganese‐Halide Scintillator Films for X‐Ray Imaging

Abstract Environmentally friendly metal halides have emerged as emitters in lighting and X‐ray imaging applications. However, the conventional scintillator fabrication process involves high‐temperature sintering or powder grinding, resulting in large bulk crystals or agglomerates, which hamper flexible device integration and processability. Here, large‐area flexible scintillation screen films containing (C 24 H 20 P) 2 MnBr 4 nanocrystals are prepared in situ, which prevents the generation of agglomerated powders or large bulk crystals, and the preparation duration and cost are reduced. The film exhibits good mechanical stability and homogeneity, and the photoluminescence quantum yield is over 85%. Moreover, the film presents excellent scintillation performance with detection limit as low as 0.608 μGy air s −1 and 14.5 lp mm −1 X‐ray imaging resolution. This excellent performance and simple preparation method are expected to favor industrial mass production.