The integration of real‐time and flexible imaging has significantly advanced X‐ray scintillator imaging technologies. However, combining both functionalities into a single scintillator material remains a fundamental challenge. To address this, we designed a zero‐dimensional cerium (III)‐based organic‐inorganic hybrid halide scintillator, MPH2CeCl5·3H2O (MPH = morpholine), using low‐cost solution processing and leveraging Ce (III)'s inherently nanosecond‐scale 4f–5d transitions. La3+‐alloying induced a dual effect, enhancing the photoluminescence quantum yield to 2.75 times the original value while maintaining a short decay time of approximately 22 ns. Combined with heavy‐atom effects, this nanosecond‐scale decay prompted investigation of X‐ray scintillation performance, revealing a respectable light yield of 10,400 photons/MeV and a low detection limit of 96.73 nGyair/s. By embedding the optimized MPH2CeCl5·3H2O into poly(methyl methacrylate) (PMMA), we fabricated a highperformance flexible film that mitigates material hygroscopicity while enabling outstanding flexibility and dynamic imaging capabilities. This film achieved motion‐artifact‐free dynamic imaging at 100 fps, clearly resolving blades rotating at 560°/s. This work demonstrates Ce (III)‐based halide hybrids as promising platforms for advanced medical and industrial imaging, offering high light yield, rapid response, and superior processability.
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