Spray-Drying Polymer Encapsulation of CsPbBr₃ Perovskite Nanocrystals with Enhanced Photostability for LED Downconverters

Lead halide perovskite nanocrystals (LHP NCs) exhibit remarkable optical and optoelectronic properties but greatly suffer from poor stability in standard ambient in-use conditions. These issues hinder their utilization many technological applications integration within industrial processes. Herein, we report a polymeric nanoencapsulation method of these NCs based on spray-drying process, with the aim using them as light downconverting materials LED devices. CsPbBr3 were encapsulated acrylate-based polymers to form NC/polymer nanocomposite beads, an average diameter lower than 500 nm. Structural characterizations demonstrated good preservation NC after spray drying despite quite harsh process Specific selected order match native surface ligands our NCs. This was necessary obtain effective encapsulation beads. To evaluate photostability under conditions, bare deposited chip blue downconverter compare luminescence stability. We observed that continuous photon excitation, beads much better resistance photobleaching compared