Abstract
The strategy to develop orange–red thermally activated delayed fluorescent (TADF) materials for high-performance organic light-emitting diodes (OLEDs) with both high maximum external quantum efficiencies (EQEsmax) and low efficiency roll-off, is ongoing pursued yet challenging. Herein, two efficient orange–red TADF emitters, T-DMAC-PPyM and P-DMAC-BPyM, with a new acceptor fused by pyrazine and maleimide, were designed and synthesized. Notably, the highly twisted conformation of P-DMAC-BPyM can inhibit the close π-π stacking, so as to reduce exciton quenching, while the “locked” biphenyl bridge can enhance the molecular rigidity, thus reducing the non-radiative decay associated with intramolecular rotation. Consequently, P-DMAC-BPyM exhibits outstanding electroluminescent performance with a remarkably high EQEmax of 26.0% and an impressively low efficiency roll-off (EQE100 is 21.7%; EQE1000 is 18.3%), which are among the best results for orange–red TADF OLEDs.
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