Confining donor conformation distributions for efficient thermally activated delayed fluorescence with fast spin-flipping.

ABSTRACT: Fast spin-flipping is the key to exploit the triplet excitons in thermally activated delayed fluorescence based organic light-emitting diodes toward high efficiency, low efficiency roll-off and long operating lifetime. In common donor-acceptor type thermally activated delayed fluorescence molecules, the distribution of dihedral angles in the film state would have significant influence on the photo-physical properties, which are usually neglected by researches. Herein, we find that the excited state lifetimes of thermally activated delayed fluorescence emitters are subjected to conformation distributions in the host-guest system. Acridine-type flexible donors have a broad conformation distribution or bimodal distribution, in which some conformers feature large singlet-triplet energy gap, le

SUBMITTER: Qiu W 

PROVIDER: S-EPMC10160101 | biostudies-literature | 2023 May

REPOSITORIES: biostudies-literature