Acceptor modulation for blue and yellow TADF materials and fabrication of all-TADF white OLED

4,4′-(4-Phenylpyridine-2,6-diyl)dibenzonitrile is designed as an acceptor to develop a sky-blue TADF emitter that exhibits a fluorescence rate constant of 10 7 s −1 and high EQEs of 25.6% and 18.5% in sky-blue and all-TADF white organic light-emitting diodes.