Molecular engineering towards efficientwhite-light-emitting perovskite

Abstract Low-dimensional hybrid perovskites have demonstrated excellent performance as white-light emitters. The broadband white emission originates from self-trapped excitons (STEs). Since the mechanism of STEs formation in is still not clear, preparing new low-dimensional relies mostly on screening lots intercalated organic molecules rather than rational design. Here, we report an atom-substituting strategy to trigger layered perovskites. Halogen-substituted phenyl are applied synthesize perovskite crystals. halogen-substituents will withdraw electrons branched chain (-R-NH 3 + ) molecule. This result positive charge accumulation -R-NH , and thus stronger Coulomb force bond )-(PbBr 4 2− ), which facilitates self-trapping. Our designed exhibit photoluminescence quantum yield 32%, color-rendering index near 90 chromaticity coordinates close standard white-light. joint experiment-theory study provides insights into benefit tailoring with boosting performance.