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Issue 26, 2018
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A simple and broadly applicable synthesis of fluorene-coupled D–σ–A type molecules: towards high-triplet-energy bipolar hosts for efficient blue thermally-activated delayed fluorescence

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Abstract

An effective two-step synthesis of high-triplet-energy (ET) bipolar hosts that is simple and broadly applicable is introduced. Electron-donating (D = (9-phenyl-9H-carbazol-3-yl/4-(9H-carbazol-9-yl)phenyl)) and -accepting (A = (tetrafluoropyridin-4-yl/4,6-diphenyl-1,3,5-triazin-2-yl)) units have been coupled to the C9 atom of fluorene to afford the four hosts 3CzFTFP, 9PhFTFP, 3CzFDPhTz, and 9PhFDPhTz with sp3 C9-centered bulky ternary structures, excellent thermal/morphological stabilities, tunable abilities for bipolar charge carrier injection/transport, and identical high ET (2.87 eV). Blue thermally-activated delayed fluorescence (TADF) devices using these new hosts and 2CzPN as the host–guest system exhibited efficient electroluminescence efficiencies of 38 cd A−1/30 lm W−1/17%, which are among the best for 2CzPN-based TADF devices. The generality of this synthetic strategy to high-ET fluorene-coupled D–σ–A type hosts was confirmed by successfully appending other D/A groups ((diphenylamino)phenyl/phenylsulfonyl) to fluorene, affording TPAFBSO.

Graphical abstract: A simple and broadly applicable synthesis of fluorene-coupled D–σ–A type molecules: towards high-triplet-energy bipolar hosts for efficient blue thermally-activated delayed fluorescence

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Publication details

The article was received on 18 Mar 2018, accepted on 10 May 2018 and first published on 12 May 2018


Article type: Paper
DOI: 10.1039/C8TC01309H
Citation: J. Mater. Chem. C, 2018,6, 6949-6957
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    A simple and broadly applicable synthesis of fluorene-coupled D–σ–A type molecules: towards high-triplet-energy bipolar hosts for efficient blue thermally-activated delayed fluorescence

    C. Li, X. Du, Y. Zhou, J. Ye, L. Fu, M. G. Humphrey, C. Wu, J. Zhao, Y. Du, S. Tao, J. Wu and C. Zhang, J. Mater. Chem. C, 2018, 6, 6949
    DOI: 10.1039/C8TC01309H

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