Vapor-assisted solid-state sintering of CsPbI3@SiO2 core-shell nanocrystals for enhanced environmental stability

This study presents a water vapor-assisted solid-state sintering strategy to fabricate CsPbI 3 @SiO 2 perovskite composites. Through high humidity and temperature, CsPbI 3 nanocrystals are efficiently encapsulated within a SiO 2 matrix, resulting in dramatically enhanced stability. The composite retains over 85 % of its initial luminescence after 360 days in ambient conditions and demonstrates excellent resistance to polar solvents and acids. Due to its high stability, the composite exhibits promising performance in white light-emitting diodes (WLEDs) and information encryption applications, providing a viable pathway toward practical perovskite-based devices.