Dibenzo[a,j]phenazine-Cored Donor–Acceptor–Donor Compounds as Green-to-Red/NIR Thermally Activated Delayed Fluorescence Organic Light Emitters
Corresponding Author
Dr. Przemyslaw Data
Physics Department, Durham University, South Road, Durham, DH1 3LE UK
Faculty of Chemistry, Silesian University of Technology, M. Strzody 9, 44-100 Poland
Search for more papers by this authorPiotr Pander
Physics Department, Durham University, South Road, Durham, DH1 3LE UK
Faculty of Chemistry, Silesian University of Technology, M. Strzody 9, 44-100 Poland
Search for more papers by this authorMasato Okazaki
Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Yamadaoka 2-1, Suita, Osaka, 565-0871 Japan
Search for more papers by this authorCorresponding Author
Prof. Dr. Youhei Takeda
Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Yamadaoka 2-1, Suita, Osaka, 565-0871 Japan
Search for more papers by this authorProf. Dr. Satoshi Minakata
Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Yamadaoka 2-1, Suita, Osaka, 565-0871 Japan
Search for more papers by this authorProf. Dr. Andrew P. Monkman
Physics Department, Durham University, South Road, Durham, DH1 3LE UK
Search for more papers by this authorCorresponding Author
Dr. Przemyslaw Data
Physics Department, Durham University, South Road, Durham, DH1 3LE UK
Faculty of Chemistry, Silesian University of Technology, M. Strzody 9, 44-100 Poland
Search for more papers by this authorPiotr Pander
Physics Department, Durham University, South Road, Durham, DH1 3LE UK
Faculty of Chemistry, Silesian University of Technology, M. Strzody 9, 44-100 Poland
Search for more papers by this authorMasato Okazaki
Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Yamadaoka 2-1, Suita, Osaka, 565-0871 Japan
Search for more papers by this authorCorresponding Author
Prof. Dr. Youhei Takeda
Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Yamadaoka 2-1, Suita, Osaka, 565-0871 Japan
Search for more papers by this authorProf. Dr. Satoshi Minakata
Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Yamadaoka 2-1, Suita, Osaka, 565-0871 Japan
Search for more papers by this authorProf. Dr. Andrew P. Monkman
Physics Department, Durham University, South Road, Durham, DH1 3LE UK
Search for more papers by this authorGraphical Abstract
Photophysics: A series of U-shaped donor–acceptor–donor emissive compounds based on the electron-accepting unit dibenzo[a,j]phenazine has been developed. Static and dynamic photophysical investigations of these compounds revealed their detailed thermally activated delayed fluorescence properties. The external quantum efficiency of the organic light-emitting diodes fabricated with the new materials reached values up to 16 %.
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).
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