Aqueous-phase assembly of ultra-stable perovskite nanocrystals in chiral cellulose nanocrystal films for circularly polarized luminescence

Abstract

In this study, we propose a novel strategy to apply full inorganic halide perovskite nanocrystals (NCs) to the assembly of chiral cellulose nanocrystal (CNC) templates in water and achieve perovskite-related circularly polarized luminescence (CPL). The poor stability and abundant surface charges of perovskite NCs which are considered to limit the assembly of perovskite NC/CNC aqueous mixtures are expected to be overcome by using a new combination of the ligand and coating polymer. By using the sodium dodecylbenzenesulfonate (SDBS) ligand and methoxypolyethylene glycol amine (mPEG-NH2) coating to synthesize perovskite NCs, the SDBS-perovskite NCs@mPEG-NH2 with superior water stability, excellent water dispersibility, and compatibility with CNCs successfully assembled to chiral films with CNCs. Quality CPL emission, high quantum yields, and excellent stability were achieved by these perovskite/CNC chiral films. Additionally, 78.3% of the fluorescence intensity and reasonable quantum yield were effectively maintained in a harsh condition for 12 days. Furthermore, perovskite NCs can be anchored by CNCs, which efficiently reduces the leak of Pb.