Dicyanophenyl derivatives, DCN1–3, were rationally synthesized and their thermally activated delayed
fluorescence properties were investigated. OLED devices were further fabricated using DCN1–3.
Particularly DCN3 (5-{3,6-di(9H-carbazole-9-yl)-9H-carbazol-9-yl}isophthalonitrile) showed excellent
device performances employing TADF mechanism with power efficiency of 15.26Cd/A, luminous
efficiency of 8.14 lm/W, the maximum external quantum efficiency of 13.33%, and brightness of 1526 Cd/
m2.