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Issue 20, 2018
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The role of fluorine-substitution on the π-bridge in constructing effective thermally activated delayed fluorescence molecules

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Abstract

Two thermally activated delayed fluorescence (TADF) emitters 9′-(4-(4,6-diphenyl-1,3,5-triazin-2-yl)-2-fluorophenyl)-9′H-9,3′:6′,9′′-tercarbazole (TCTZ-F) and 9′-(4-(4,6-diphenyl-1,3,5-triazin-2-yl)-2,6-difluorophenyl)-9′H-9,3′:6′,9′′-tercarbazole (TCTZ-2F) were synthesized and compared to the previously reported molecule 9′-(4-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl)-9′H-9,3′:6′,9′′-tercarbazole (TCTZ) to explore the possible effects of the fluorine atom(s) on the molecular conformation, electronic coupling between the donor and acceptor groups, and consequently the photophysical behavior of the emitters. Specifically, the TCTZ-F molecule was calculated to have a smaller dihedral angle than TCTZ-2F and a smaller S1–T1 gap than TCTZ, which led it to have the highest photoluminescence quantum yield (PLQY) among this series of compounds. An OLED fabricated with TCTZ-F as the emitter achieved the highest external quantum efficiencies (22.5%) of this series, indicating that fluorination can play a useful role in TADF emitters.

Graphical abstract: The role of fluorine-substitution on the π-bridge in constructing effective thermally activated delayed fluorescence molecules

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Publication details

The article was received on 09 Mar 2018, accepted on 23 Apr 2018 and first published on 23 Apr 2018


Article type: Paper
DOI: 10.1039/C8TC01158C
Citation: J. Mater. Chem. C, 2018,6, 5536-5541
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    The role of fluorine-substitution on the π-bridge in constructing effective thermally activated delayed fluorescence molecules

    Y. Li, J. Liang, H. Li, L. Cui, M. Fung, S. Barlow, S. R. Marder, C. Adachi, Z. Jiang and L. Liao, J. Mater. Chem. C, 2018, 6, 5536
    DOI: 10.1039/C8TC01158C

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