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Dibenzo[a,j]phenazine‐Cored Donor–Acceptor–Donor Compounds as Green‐to‐Red/NIR Thermally Activated Delayed Fluorescence Organic Light Emitters |
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| Authors: | Dr. Przemyslaw Data Piotr Pander Masato Okazaki Prof. Dr. Youhei Takeda Prof. Dr. Satoshi Minakata Prof. Dr. Andrew P. Monkman |
| Affiliation: | 1. Physics Department, Durham University, Durham, UK;2. Faculty of Chemistry, Silesian University of Technology, Poland;3. Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Osaka, Japan |
| 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 |