High-Resolution X-ray Image from Copper-Based Perovskite Hybrid Polymer.

Cs 3 Cu 2 I 5 nanocrystals (NCs) are considered to be promising materials due to their high photoluminescence efficiency, lack of lead toxicity, and X-ray responsiveness. However, during the crystallization process, NCs are prone to agglomeration and exhibit uneven size distribution, resulting in several light scattering that severely affect their imaging resolution. Herein, we successfully developed a high-resolution scintillator film by growing copper-based perovskite NCs within a hybrid polymer matrix. By leveraging the ingenious integration of polyvinylidene fluoride (PVDF) and polymethyl methacrylate (PMMA), the size and distribution uniformity of Cs 3 Cu 2 I 5 NCs can be effectively controlled. Consequently, a high spatial resolution of 14.3 lp mm -1 and a low detection limit of 105 nGy s -1 are achieved, and the scintillator film has excellent flexibility and stability. These results highlight the promising application of Cs 3 Cu 2 I 5 scintillator films in low-cost, flexible, and high-performance medical imaging.