La‐Tuned Scintillators With Nanosecond Response and High Flexibility for Blur‐Free X‐Ray Imaging

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 nGy_air/s. By embedding the optimized MPH₂CeCl₅·3H₂O into poly(methyl methacrylate) (PMMA), we fabricated a high‐performance 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.