Self-Absorption-Free Perovskite X-ray Scintillators via Engineered Interfacial Energy Transfer

Strong photon self-absorption severely limits the performance of metal–halide perovskite X-ray scintillators. Herein, we report an in situ interfacial growth strategy to construct a hybrid ZnS:Ag–FAPbBr3 nanocrystal (NC) system embedded in a flexible PVDF matrix, enabling efficient, self-absorption-free scintillation. Density functional theory (DFT) and ultrafast spectroscopy confirm rapid Förster resonance energy transfer from ZnS:Ag to FAPbBr3 within ∼20 ps, achieving 83% efficiency. The resulting scintillator films exhibit high imaging resolution (20-line pair/mm) and a remarkably low detection limit (166 nGy s–1), surpassing medical diagnostic standards by over 30 times. Moreover, the films maintain >90% emission after 604.8 Gy continuous exposure. This scalable strategy eliminates self-absorption and enhances the stability of FAPbBr3 NCs, paving the way for robust, high-sensitivity perovskite scintillators for medical, industrial, and underwater X-ray imaging.