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CN-Containing Donor-Accepter Type Small Molecular Materials for Thermally Activated Delayed Fluorescence OLEDs

Abstract

Very recently, the design of thermally activated delayed fluorescent (TADF) emitters has drawn intense attention in 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 complex, exciplex etc. Among, donor-accepter (D-A) structured small molecules have been regarded as the most popular categories due to the twisted structure with large dihedral angle between the electron-donating and accepting subunits which permits small singlet-triplet energy gaps (△EST) 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 on the number of electron-accepting CN and the relative linking position with the the electron-donating π-conjugated units. Herein, we review 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 as well as acrylonitrile derivatives. Besides,the structure-property relationships are specially emphasized.

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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, Accepted Manuscript
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    CN-Containing Donor-Accepter Type Small Molecular Materials for Thermally Activated Delayed Fluorescence OLEDs

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

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