Simple construction of deep-red hexaazatrinaphthylene-based thermally activated delayed fluorescence emitters for efficient solution-processed OLEDs with a peak at 692 nm

Solution-processable deep-red TADF emitters are simply constructed through a catalyst-free nucleophilic substitution reaction, and enable high-performance OLEDs with an EQE of 4.8% and electroluminescence emission peak at 692 nm.