Thermally activated delayed fluorescence in neutral and cationic stages of aza-nanographene decorated with 6.6.6 defects.

Authors

Rohith Valavil Suku, Illia E Serdiuk, Krzysztof Dzieszkowski, Łukasz Orzeł, Monika Kijewska, Tadeusz M Muzioł, Miłosz Siczek, Miłosz Pawlicki

Published in

Chemical science. Oct 09, 2026. Epub Oct 09, 2026.

Abstract

Heteroatom-doped polycyclic aromatic hydrocarbons (PAHs) show substantially modified electron distribution caused by the presence of either an electron-rich or electron-poor element that significantly influences the optical properties of final molecules. A novel synthetic approach with a PBr₃ coupling agent, applied to precisely designed monomers and followed by intramolecular fusion, incorporates a tetraaza-dibenzo[g,p]chrysene decorated with two 6.6.6 defects into a nanographene-like system. The final derivative shows an efficient green fluorescence emission (λ _PF = 530 nm) accompanied by phosphorescence (λ _phos = 565 nm). The emission is tuned with simple protonation and shifted bathochromically to λ _PF = 620 nm and λ _phos = 640 nm. Both forms show thermally activated delayed fluorescence (TADF) with PLQYs of 93% for the green band and 50% for the red one, showing a unique ability to sustain the TADF behaviour after protonation.

PMID:
42898740
Bibliographic data and abstract were imported from PubMed on 20 Oct 2026.

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