Tailoring efficient manganese bromide-based scintillator films with ethyl acetate assistance

Abstract Metal halide (MH) scintillators serve as a compelling substitute for traditional scintillators in x-ray detection and imaging due to their low-temperature fabrication process, high light yield and mechanical flexibility. Nevertheless, the spatial resolution and photoluminescence quantum yield (PLQY) of these films are hindered by the agglomeration and uneven distribution of MHs crystal particles during the fabrication process. We introduce a modified fabrication approach for MH scintillator films involving an additional step of ethyl acetate (EA) treatment, resulting in the preparation of a smooth EA-treated (Ph 4 P) 2 MnBr 4 /Polydimethylsiloxane film (Ph 4 P = Tetraphenylphosphonium). The carbonyl groups within EA interact with elements of the (Ph 4 P) 2 MnBr 4 microcrystals powder, ensuring uniform dispersion and preventing agglomeration. The EA-treated composite film demonstrates a remarkable PLQY of approximately 95.8% and an impressive spatial resolution of 14 lp mm −1 , with enhanced stability under harsh environments. These characteristics ensure its suitability as a high-performance x-ray imaging scintillator.