Molecular asymmetry and rigidification as strategies to activate and enhance thermally activated delayed fluorescence in deep-blue MR-TADF emitters.
Rangani Wathsala WeerasingheJohn Marques Dos SantosYouhei ChitoseTomas MatulaitisStuart L WarrinerDebasish BarmanChin-Yiu ChanYouichi TsuchiyaEli Zysman-ColmanChihaya AdachiPublished in: Physical chemistry chemical physics : PCCP (2024)
Two novel deep-blue multi-resonance thermally activated delayed fluorescence (MR-TADF) emitters, 1B-CzCrs and 2B-CzCrs, containing a fused carbazole unit were synthesized. The carbazole contributed to the emergence of TADF in these small molecules. Particularly, organic light-emitting diodes with 1B-CzCrs doped in the mCP host achieve a maximum external quantum efficiency of 12.8% at CIE coordinates of (0.146, 0.062).