Remarkable photostability enhancement in FAPbBr3 perovskite nanocrystal polymer films via lecithin passivation

Abstract

Although perovskite nanocrystals (PeNCs) exhibit superior optical properties, their instability under photo-irradiation and moisture hinders their practical applications. Herein, we report a robust stabilization strategy for FAPbBr₃ PeNC polymer films treated by ligand engineering with soy lecithin. Exploiting the synergistic defect passivation of the zwitterionic head group and the hydrophobic shielding of the double long-alkyl-chain tails, we achieved a 300-fold enhancement in photostability (T₅₀ > 360 h). Furthermore, the resulting films exhibited exceptional water stability. An on-chip white LED was fabricated using a PeNC polymer film with superior color characteristics. This scalable and cost-effective approach effectively circumvents critical stability bottlenecks, thereby accelerating the commercialization of PeNC-based optoelectronics.