Thermally activated delayed fluorescence of N-phenylcarbazole and triphenylamine functionalised tris(aryl)triazines

• Triazine derivatives for thermally activated delayed fluorescence were synthesized.
• The photophysical and electrochemical properties of the new molecules were studied.
• The energy gap between singlet and triplet was tuned from 0.24 eV to 0.18 eV.

N–phenyl carbazole and triphenylamine functionalized tris(aryl)triazines, as well as the corresponding mononers, have been synthesized by Suzuki cross–coupling reactions. The electronic, photophysical and electrochemical properties of these materials can be effectively tuned by manipulation of the constitution of acceptor and donor units. N–phenyl carbazole and triphenylamine functionalized 2,4,6–trisphenyl–1,3,5–triazines exhibit small energy gaps between the singlet and triplet (0.24 eV and 0.18 eV), and offer potential for application as thermally activated delayed fluorescence materials. The results are supported by time–dependent density functional theory calculations, delayed and time-resolved fluorescence data.

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