Effective thermally activated delayed fluorescence emitter and its performance in OLED device

• A series of carbazole containing DCN were synthesized as potential OLED dopants.
• DCN3 displayed a clear delayed fluorescence component with a lifetime of 3.26 μs.
• A twisted structure between donor and acceptor may facilitate a long lifetime.
• OLED device of DCN3 showed excellent device performances with PE of 15.26 Cd/A.
• It shows the maximum EQE of 13.33%, and brightness of 1526 Cd/m2.

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.

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