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Issue 31, 2017
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CN-Containing donor–acceptor-type small-molecule materials for thermally activated delayed fluorescence OLEDs

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Abstract

Very recently, the design of thermally activated delayed fluorescence (TADF) emitters has drawn significant attention in the production of low-cost and highly efficient organic light-emitting diodes (OLEDs). Several types of TADF materials have been successfully developed such as pure organic small molecules, polymers, metal complexes, and exciplexes. Among them, donor–acceptor (D–A)-structured small molecules have been regarded as most popular due to their twisted structure with large dihedral angle between the electron-donating and accepting subunits that permits small singlet–triplet energy gaps (ΔEST) for efficient reverse intersystem crossing (RISC). Various electron-withdrawing functional groups have been introduced for D–A-type TADF materials. The conjugated cyano (CN) moiety has been mostly demonstrated through rational molecular design based on the number of electron-accepting CN molecules and the relative linking position with electron-donating π-conjugated units. Herein, we reviewed the recent development of CN-containing D–A-type small molecular TADF materials according to different CN containing acceptors, such as mono- or multi-cyanobenzene, mono- or dicyano based N-heterocyclic aromatic rings and acrylonitrile derivatives. Moreover, structure–property relationships have been specially emphasized.

Graphical abstract: CN-Containing donor–acceptor-type small-molecule materials for thermally activated delayed fluorescence OLEDs

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Publication details

The article was received on 05 Jun 2017, accepted on 11 Jul 2017 and first published on 11 Jul 2017


Article type: Review Article
DOI: 10.1039/C7TC02481A
Citation: J. Mater. Chem. C, 2017,5, 7699-7714
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    CN-Containing donor–acceptor-type small-molecule materials for thermally activated delayed fluorescence OLEDs

    X. Cao, D. Zhang, S. Zhang, Y. Tao and W. Huang, J. Mater. Chem. C, 2017, 5, 7699
    DOI: 10.1039/C7TC02481A

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