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Highly emissive excitons with reduced exchange energy in thermally activated delayed fluorescent molecules

Research output: Contribution to journalArticle


Anton Pershin, David Hall, Vincent Lemaur, Juan-Carlos Sancho-Garcia, Luca Muccioli, Eli Zysman-Colman, David Beljonne, Yoann Olivier

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Unlike conventional thermally activated delayed fluorescence chromophores, boron-centered azatriangulene-like molecules combine a small excited-state singlet-triplet energy gap with high oscillator strengths and minor reorganization energies. Here, using highly correlated quantum-chemical calculations, we report this is driven by short-range reorganization of the electron density taking place upon electronic excitation of these multi-resonant structures. Based on this finding, we design a series of π-extended boron- and nitrogen-doped nanographenes as promising candidates for efficient thermally activated delayed fluorescence emitters with concomitantly decreased singlet-triplet energy gaps, improved oscillator strengths and core rigidity compared to previously reported structures, permitting both emission color purity and tunability across the visible spectrum.


Original languageEnglish
Article number597
Number of pages5
JournalNature Communications
Early online date5 Feb 2019
Publication statusE-pub ahead of print - 5 Feb 2019

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ID: 257704053