Abstract
We synthesized two blue thermally activated delayed fluorescence (TADF) emitters, TAZtCz‐1 and TAZtCz‐2 based on a molecular design concept introducing auxillary acceptor. These two emitters are designed to control acceptor strength of triazine moiety by introducing another accepting unit for controlled emitting wavelength. The t‐butyl substituted carbazole moiety was used as a donor. Their highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) were ‐6.10/‐3.49 and ‐6.07/‐3.33 eV and the singlet and triplet energy were 2.86/2.70 and 2.92/2.74 eV. The two emitters showed small singlet and triplet energy gap (ΔEst) below 0.2 eV. Maximum external quantum efficiency of two emitters showed above 20% and the color coordinate of (0.21, 0.42) and (0.15, 0.17).
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