Issue 31, 2017

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

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

Article information

Article type
Review Article
Submitted
05 Jun 2017
Accepted
11 Jul 2017
First published
11 Jul 2017

J. Mater. Chem. C, 2017,5, 7699-7714

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

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements