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

Pachaiyappan Rajamalli, Dongyang Chen, Subeesh Madayanad Suresh, Youichi Tsuchiya, Chihaya Adachi, Eli Zysman-Colman

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19 Citations (Scopus)
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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 ΔEST 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 ΔESTs. The ΔESTs 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 λEL of 460 nm and CIE of (0.15, 0.16). The maximum external quantum efficiency (EQEmax) reaches 11.6%, with a maximum luminance (Lmax) of up to 6892 cd m‐2 , while the device based on DTCz‐DPz exhibits sky blue emission with λEL of 484 nm and CIE of (0.15, 0.30), an EQEmax of 7.2%, and Lmax of 8802 cd m‐2 .
Original languageEnglish
Pages (from-to)2285-2293
Number of pages10
JournalEuropean Journal of Organic Chemistry
Issue number16
Early online date12 Mar 2021
Publication statusPublished - 28 Apr 2021


  • Thermally activated delayed fluorescence
  • TADF
  • Pyrazine
  • Donor-acceptor
  • Organic light-emitting diodes


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