Presentation Information
[18a-M_101-5]Enhanced Photostability of Lecithin-Treatment FAPbBr3 Perovskite Nanocrystals for Color-Conversion Displays
〇(M1)Takuro Iizuka1, Shunya Abe1, Satoshi Asakura2, Motofumi Kashiwagi3, Takao Oto1, Akito Masuhara1,4 (1.Grad. Sch. of Sci. and Eng., Yamagata Univ., 2.Ise Chem Corp., 3.Zeon Corp., 4.FROM, Yamagata Univ.)
Keywords:
Perovskite nanocrystal,Stability,Display
Lead halide perovskite nanocrystals (PeNCs) have attracted considerable attention as photoluminescent materials for next-generation displays. However, their practical application is severely limited by poor photostability under blue light excitation (450 nm) and in the presence of moisture. The major degradation pathways include (i) ligand desorption–induced surface defect and trap formation, (ii) reduction of surface Pb2+ to metallic Pb0 caused by excessive carrier accumulation under continuous photoexcitation, and (iii) structural decomposition triggered by moisture penetration. In this study, we focused on lecithin, a phospholipid molecule possessing a zwitterionic phosphatidyl group and two long alkyl chains. This molecular structure enables strong binding to the PeNC while simultaneously enhancing high hydrophobicity, thereby suppressing moisture etching to the PeNC in a synergistic manner. On the photostability test, lecithin-modified PeNCs exhibited dramatically maintained PL intensity, with the PL half-lifetime (T50) extended from 1 h to over 300 h.