compounds, those containing boron and those containing carbonyl groups as acceptor fragments in the polycyclic aromatic hydrocarbon skeleton. Using this molecular design, this compound shows desirable narrowband deep blue emission and efficient TADF character. The OLED with DOBDiKTa as the emitter and mCP:PPT (1:1) as the co-host exhibits an EQEmax of 17.4%, an efficiency roll-off of 32% at 100 cd m -2 , and CIE coordinates of (0.14, 0.12).