Twin-emitter design strategy for use in solution-processable thermally activated delayed fluorescence organic light-emitting diodes

In this work we showcase the emitter DICzTRZ in which we employed a twin-emitter design of our previously reported material, ICzTRZ. This new system presented a red-shifted emission at 488 nm compared to that of ICzTRZ at 475 nm and showed a comparable photoluminescence quantum yield of 57.1% in a 20 wt% CzSi film versus 63.3% for ICzTRZ. The emitter was then incorporated within a solution-processed organic light-emitting diode that showed a maximum external quantum efficiency of 8%, with Commision Internationale de l’Éclairage coordinate of (0.21, 0.47), at 10 cd m−2.