Fast delayed emission in new pyridazine-based compounds
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Three novel donor-acceptor molecules comprising the underexplored pyridazine (Pydz) acceptor moiety have been synthesized and their structural, electrochemical and photophysical properties thoroughly characterized. Combining Pydz with two phenoxazine donor units linked via a phenyl bridge in a meta configuration ( dPXZMePydz ) leads to high reverse intersystem crossing rate krISC = 3.9 ∙ 106 s-1 and fast thermally activated delayed fluorescence (TADF) with <500 ns delayed emission lifetime. Efficient triplet harvesting via the TADF mechanism is demonstrated in OLEDs using dPXZMePydz as the emitter but does not occur for compounds bearing weaker donor units.
Krotkus , S , Matulaitis , T , Diesing , S , Copley , G J , Archer , E , Keum , C , Cordes , D B , Slawin , A M Z , Gather , M C , Zysman-Colman , E & Samuel , I D W 2021 , ' Fast delayed emission in new pyridazine-based compounds ' , Frontiers in Chemistry , vol. 8 , 572862 . https://doi.org/10.3389/fchem.2020.572862
Frontiers in Chemistry
Copyright © 2021 Krotkus, Matulaitis, Diesing, Copley, Archer, Keum, Cordes, Slawin, Gather, Zysman-Colman and Samuel. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
DescriptionWe thank the EPSRC for financial support (grants EP/P010482/1 and EP/R035164/1). We thank the EPSRC UK National Mass Spectrometry Facility at Swansea University for analytical services. G.C. acknowledges funding by the European Commission through a Marie Skłodowska Individual Fellowship (No. 799302). C.K. acknowledges support from the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2017R1A6A3A03012331).
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