Robust perovskite-polymer scintillating fibers via a deep-dyeing method

Perovskite materials are gaining attention as next-generation scintillators due to their excellent optical properties, including strong light absorption, high light yield, fast decay times, and ease of solution processing. However, perovskite nanoparticles (PNPs) often suffer from environmental sensitivity and aggregation, limiting practical use. To address these limitations, researchers have explored embedding PNPs into polymer matrices to improve stability and usability; however, existing methods provide limited control over nanoparticle size and transparency, restrict polymer selection, and are incompatible with low-swelling polymers such as polyethylene terephthalate (PET), which offer superior barrier properties and improved durability. We introduce a deep-dyeing method for uniform incorporation of hybrid (MAPbBr₃) and all-inorganic (CsPbBr₃, CsPb(Br/I)₃) PNPs into low-swelling PET fibers to form composites, controlling size and loading while maintaining transparency. The fibers exhibit stable photoluminescence and radioluminescence, high light yield (~23,000 photons/MeV), thermal stability, moisture resistance, and tunable emission. These results highlight the broad potential of these scintillating fibers in x-ray imaging and dosimetry under harsh conditions.