Remarkable Photostability Enhancement in FAPbBr₃ Perovskite Nanocrystal Polymer Films via Lecithin Passivation

Abstract

Although perovskite nanocrystals (PeNCs) exhibit excellent optical properties, their instability under photo-irradiation and ambient moisture severely hinders their practical applications. Herein, we report a robust stabilization strategy for FAPbBr₃ PeNCs through ligand engineering using soy lecithin. Lecithin provides synergistic defect passivation through zwitterionic head group and hydrophobic double long-alkyl tails, resulting in a 300-fold enhancement in photostability, with a half-lifetime (T50 ) exceeding 360 h. Furthermore, the resulting films demonstrated exceptional resistance to water exposure. We fabricated an on-chip white LED using the PeNC polymer films with color characteristics. This simple and widely applicable approach overcomes critical stability bottlenecks, thereby accelerating the commercialization of PeNC-based optoelectronics.