Dibenzo[a,j]phenazine-Cored Donor-Acceptor-Donor Compounds as Green-to-Red/NIR Thermally Activated Delayed Fluorescence Organic Light Emitters

Przemyslaw Data; Piotr Pander; Masato Okazaki; Youhei Takeda; Satoshi Minakata; Andrew P Monkman

doi:10.1002/anie.201600113

Dibenzo[a,j]phenazine-Cored Donor-Acceptor-Donor Compounds as Green-to-Red/NIR Thermally Activated Delayed Fluorescence Organic Light Emitters

Angew Chem Int Ed Engl. 2016 May 4;55(19):5739-44. doi: 10.1002/anie.201600113. Epub 2016 Apr 6.

Authors

Przemyslaw Data^{1

2}, Piotr Pander^{3

4}, Masato Okazaki⁵, Youhei Takeda⁶, Satoshi Minakata⁵, Andrew P Monkman³

Affiliations

¹ Physics Department, Durham University, South Road, Durham, DH1 3LE, UK. przemyslaw.data@durham.ac.uk.
² Faculty of Chemistry, Silesian University of Technology, M. Strzody 9, 44-100, Poland. przemyslaw.data@durham.ac.uk.
³ Physics Department, Durham University, South Road, Durham, DH1 3LE, UK.
⁴ Faculty of Chemistry, Silesian University of Technology, M. Strzody 9, 44-100, Poland.
⁵ Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Yamadaoka 2-1, Suita, Osaka, 565-0871, Japan.
⁶ Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Yamadaoka 2-1, Suita, Osaka, 565-0871, Japan. takeda@chem.eng.osaka-u.ac.jp.

PMID: 27060474
DOI: 10.1002/anie.201600113

Abstract

A new family of thermally activated delayed fluorescence (TADF) emitters based on U-shaped D-A-D architecture with a novel accepting unit has been developed. All investigated compounds have small singlet-triplet energy splitting (ΔEST ) ranging from 0.02 to 0.20 eV and showed efficient TADF properties. The lowest triplet state of the acceptor unit plays the key role in the TADF mechanism. OLEDs fabricated with these TADF emitters achieved excellent efficiencies up to 16 % external quantum efficiency (EQE).

Keywords: charge transfer; electroluminescence; exciplexes; fluorescence; organic light-emitting diodes.

Publication types

Research Support, Non-U.S. Gov't