Lowering of the singlet-triplet energy gap via intramolecular exciton-exciton coupling.

ABSTRACT: Organic dyes typically have electronically excited states of both singlet and triplet multiplicity. Controlling the energy difference between these states is a key factor for making efficient organic light emitting diodes and triplet sensitizers, which fulfill essential functions in chemistry, physics, and medicine. Here, we propose a strategy to shift the singlet excited state of a known sensitizer to lower energies without shifting the energy of the triplet state, thus without compromising the ability of the sensitizer to do work. We covalently connect two to four sensitizers in such a way that their transition dipole moments are aligned in a head-to-tail fashion, but, through steric encumbrance, the delocalization is minimized between each moiety. Exciton coupling between the singlet ex

SUBMITTER: Schafer C 

PROVIDER: S-EPMC11461719 | biostudies-literature | 2024 Oct

REPOSITORIES: biostudies-literature