Abstract
The design rule of an assistant dopant for enhanced external quantum efficiency (EQE) in hyperfluorescence organic light‐emitting diodes is investigated by synthesizing two assistant dopants with thermally activated delayed fluorescent (TADF) features, BPAc and BPAcCz, by combining a benzophenone acceptor and a dimethylacridane donor. BPAc has only the benzophenone acceptor and the dimethylacridane donor, whereas BPAcCz has an extra carbazole donor added to the BPAc structure. Comparison of the two assistant dopants reveals that the incorporation of the donor unit with a small dihedral angle degrades the efficiency of the hyperfluorescence devices by Dexter energy transfer. The hyperfluorescence devices with the BPAc and BPAcCz assistant dopants exhibit EQE of 16.6% and 15.0%, respectively.
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