title: Dibenzo[a,j]phenazine-Cored Donor-Acceptor-Donor Compounds as Green-to-Red/NIR Thermally Activated Delayed Fluorescence Organic Light Emitters.
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).
authors.affiliation: Physics Department, Durham University, South Road, Durham, DH1 3LE, UK. przemyslaw.data@durham.ac.uk.|Faculty of Chemistry, Silesian University of Technology, M. Strzody 9, 44-100, Poland. przemyslaw.data@durham.ac.uk.
authors.forename: Przemyslaw
authors.identifier: 0000-0002-1831-971X
authors.initials: P
authors.lastname: Data
authors.affiliation: Physics Department, Durham University, South Road, Durham, DH1 3LE, UK.|Faculty of Chemistry, Silesian University of Technology, M. Strzody 9, 44-100, Poland.
authors.forename: Piotr
authors.initials: P
authors.lastname: Pander
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Yamadaoka 2-1, Suita, Osaka, 565-0871, Japan.
authors.forename: Masato
authors.initials: M
authors.lastname: Okazaki
authors.affiliation: 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.
authors.forename: Youhei
authors.identifier: 0000-0001-9103-4238
authors.initials: Y
authors.lastname: Takeda
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Yamadaoka 2-1, Suita, Osaka, 565-0871, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Minakata
authors.affiliation: Physics Department, Durham University, South Road, Durham, DH1 3LE, UK.
authors.forename: Andrew P
authors.identifier: 0000-0002-0784-8640
authors.initials: AP
authors.lastname: Monkman
keywords: charge transfer; electroluminescence; exciplexes; fluorescence; organic light-emitting diodes