Deep blue oxadiazole-containing thermally activated delayed fluorescence emitters for organic light-emitting diodes
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A series of four novel deep blue to sky blue thermally activated delayed fluorescence (TADF) emitters (2CzdOXDMe, 2CzdOXD4MeOPh, 2CzdOXDPh and 2CzdOXD4CF3Ph) have been synthesized and characterized. These oxadiazole-based emitters demonstrated bluer emission compared with reference emitter 2CzPN thanks to the weaker acceptor strength of oxadiazole moieties. In particular, the oxadiazole compounds doped in hosts (mCP and PPT) emitted from 435-474 nm with photoluminescence quantum yields ranging from 14%-55%. The emitters possess relatively large singlet-triplet excited state energy gaps (ΔEST) from 0.25-0.46 eV resulting in long lifetimes of the delayed components ranging from 4.8 to 25.8 ms. Electroluminescent devices using these oxadiazole emitters as dopant emitters gave emission maxima (λEL) from 446 nm to 474 nm with maximum external quantum efficiencies ranging from 4.2-11.2%.
Wong , M Y , Krotkus , S , Copley , G , Li , W , Murawski , C , Hall , D , Hedley , G , Jaricot , M , Cordes , D B , Slawin , A M Z , Olivier , Y , Beljonne , D , Muccioli , L , Moral , M , Sancho-García , J C , Gather , M C , Samuel , I D W & Zysman-Colman , E 2018 , ' Deep blue oxadiazole-containing thermally activated delayed fluorescence emitters for organic light-emitting diodes ' , ACS Applied Materials & Interfaces , vol. In press . https://doi.org/10.1021/acsami.8b11136
ACS Applied Materials & Interfaces
Copyright © 2018 American Chemical Society. This work has been made available online in accordance with the publisher’s policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version. The final published version of this work is available at: https://doi.org10.1021/acsami.8b11136
DescriptionEZ-C thanks the University of St Andrews for support. The authors are grateful to the EPSRC for financial support (grants EP/P010482/1, EP/J01771X and EP/J00916). IDWS is a Royal Society Wolfson Research Merit Award Holder. CM acknowledges funding by the European Commission through a Marie Skłodowska Curie Individual Fellowship (No. 703387).
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