This invention demonstrates the leveraging of an ammonium halide-containing copolymer or a guanidium halide-containing copolymer to color tune lead halide perovskite nanocrystals (NCs). These multifunctional ligands boost the photoluminescence quantum yield and facilitate a route to control inter-NC halide exchange kinetics based on binding of the polymer chains to the NC surface and their solvent-responsive aggregation.
