Composition Modulation of Cs 2 ZrCl 6 ‐based Scintillator Film via Vapor Deposition for Large‐Area X‐Ray Imaging

Abstract Metal halide scintillators for X‐ray imaging have shown remarkable potential, however, achieving large‐area film has been hindered by challenges in materials design and fabrication methods, particularly regarding composition uniformity for high‐resolution imaging applications. Here, a multi‐source vapor deposition (MSVD) method is employed to realize the facile composition modulation by designing MA + and Br − (MA + = methylammonium) co‐doped Cs 2 ZrCl 6 (MCZCB) and further synthesizing a uniform and large‐area scintillator film. The incorporation of MA + and Br − ions, with their slightly larger ionic radius, induces lattice distortion, enhancing the self‐trapped excitons (STEs) luminescence of the MCZCB and significantly boosting the photoluminescence quantum yield (PLQY) from 70% in pristine Cs 2 ZrCl 6 (CZC) to an impressive 95%. Finally, a large‐area of 100 cm 2 and 95% visible light transparent scintillator film is fabricated, achieving a spatial resolution of 25.1 lp mm −1 . This result demonstrates that MSVD technology is promising as a practical strategy for fabricating large‐area X‐ray imaging film.