Planar and rigid pyrazine based TADF emitter for deep blue bright organic light emitting diodes

Two blue thermally activated delayed fluorescence (TADF) emitters bearing di‐tert‐butyl carbazoles as the electron donor groups and pyrazine (DTCz‐Pz) or dipyrazine (DTCz‐Pz) as the electron acceptor are presented. The DFT calculations predict DTCz‐Pz and DTCz‐DPz to possess high S₁ energies (3.19 eV and 3.08 eV, respectively), and relatively large ΔE_ST values (0.52 eV and 0.56 eV, respectively). The closely layered intermediate triplet states between S₁ and T₁ , predicted by DFT calculations, are expected to facilitate the reverse intersystem crossing (RISC) and improve spin‐vibronic coupling efficiency between the excited states even the relatively larger ΔE_STs. The ΔE_STs for DTCz‐Pz and DTCz‐DPz are 0.27 eV and 0.38 eV, and both molecules show high photoluminescence quantum yields (65%, and 70%, respectively) and the decay lifetimes show temperature dependence in a PPT host, which is consistent that both molecules are TADF emitters in PPT. The OLEDs based on DTCz‐Pz exhibit deep blue emission with λ_EL of 460 nm and CIE of (0.15, 0.16). The maximum external quantum efficiency (EQE_max) reaches 11.6%, with a maximum luminance (L_max) of up to 6892 cd m^‐2 , while the device based on DTCz‐DPz exhibits sky blue emission with λ_EL of 484 nm and CIE of (0.15, 0.30), an EQE_max of 7.2%, and L_max of 8802 cd m^‐2 .