Ultrafast energy transfer between all-inorganic tin-based perovskite nanocrystals and RhB chromophore

This study explores the energy transfer mechanisms through visible-light excitation of hybrids based on CsSnBr 3 nanocrystals and Rhodamine B (RhB) chromophores. The ability of RhB dyes to donate energy to CsSnBr 3 is comprehensively investigated with steady-state and time-resolved photoluminescence, as well as femtosecond transient absorption spectroscopy. The Förster resonance energy transfer (FRET) dominates (85.1 %) the photosensitization of the singlet excited state of RhB in the nanocrystal-chromophore hybrids with a rate constant of 4.3 × 10 9 s −1 . These findings reveal the energy transfer mechanism and highlight the design of light-harvesting devices based on CsSnBr 3 nanocrystals and organic chromophores.