Electron spin resonance resolves intermediate triplet states in delayed fluorescence.

ABSTRACT: Molecular organic fluorophores are currently used in organic light-emitting diodes, though non-emissive triplet excitons generated in devices incorporating conventional fluorophores limit the efficiency. This limit can be overcome in materials that have intramolecular charge-transfer excitonic states and associated small singlet-triplet energy separations; triplets can then be converted to emissive singlet excitons resulting in efficient delayed fluorescence. However, the mechanistic details of the spin interconversion have not yet been fully resolved. We report transient electron spin resonance studies that allow direct probing of the spin conversion in a series of delayed fluorescence fluorophores with varying energy gaps between local excitation and charge-transfer triplet states. The o

SUBMITTER: Drummond BH 

PROVIDER: S-EPMC8313702 | biostudies-literature | 2021 Jul

REPOSITORIES: biostudies-literature