Scalable, High-Efficiency, and High-Resolution X-Ray Scintillator Films Enabled by Industrial Blow Molding of Ag-Doped Cs3Cu2I5@Polyethylene Composites

X-ray imaging plays an irreplaceable role in global security inspection, medical diagnostics, and industrial nondestructive testing, yet conventional single-crystal scintillators suffer from high costs, complex fabrication, and poor flexibility. Here, we report a flexible x-ray scintillator film (Cs 3 Cu 2 I 5 :Ag@PE) that uniquely combines industrial-scale processability with ultra-high luminescence efficiency. Ag doping can cause lattice expansion and increase material density, boosting x-ray absorption and luminescence. Notably, the film is fabricated via scalable ball milling and industrial blown film extrusion. Compared to a maximum quantum efficiency of 43.3% typically achieved via the micropatterned method, our large-scale extrusion strategy delivers a remarkable PLQY of 75.4%. The film also exhibits excellent stability (89.6% retention after 2000 h) and radioluminescence efficiency comparable to commercial LuAG:Ce. Furthermore, it achieves an ultra-low detection limit of 212.5 nGy/s and a superior spatial resolution 175% higher than commercial CsI:Tl. This work highlights a scalable and highly efficient route toward high-performance flexible x-ray imaging for clinical and industrial applications.