Flexible Wood‐Based X‐Ray Scintillator Film Using Lead‐Free Cs3Cu2I5 Perovskite Nanoparticles

The prevalent use of unsustainable polymers in current X‐ray scintillators poses a significant environmental concern. The advancement of biodegradable X‐ray scintillators holds promise in mitigating escalating environmental issues tied to electronic or medical waste and carbon footprints. Herein, a biodegradable and flexible X‐ray scintillation film is presented employing lead‐free 0D Cs 3 Cu 2 I 5 perovskite nanoparticles integrated into densified‐delignified wood (Cs 3 Cu 2 I 5 @D‐Wood). The Cs 3 Cu 2 I 5 @D‐Wood film demonstrates precise and detailed X‐ray imaging capabilities, achieving a high spatial resolution of 10 line pairs per millimeter (lp·mm −1 ). To minimize the environmental impact associated with disposal, metal and halide ions (e.g., Cs + , Cu + , I − ) from Cs 3 Cu 2 I 5 @D‐Wood can be easily retrieved by a simple solvent extraction process. The approach showcases the potential of biodegradable wood‐based X‐ray scintillation screens as alternatives to conventional, plastic‐based screens. This offers a significant contribution to environmental sustainability by reducing electronic or medical waste.