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Deep blue oxadiazole-containing thermally activated delayed fluorescence emitters for organic light-emitting diodes

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Date
07/09/2018
Author
Wong, Michael Yin
Krotkus, Simonas
Copley, Graeme
Li, Wenbo
Murawski, Caroline
Hall, David
Hedley, Gordon
Jaricot, Marie
Cordes, David B.
Slawin, Alexandra M. Z.
Olivier, Yoann
Beljonne, David
Muccioli, Luca
Moral, Mónica
Sancho-García, Juan Carlos
Gather, Malte C
Samuel, Ifor D. W.
Zysman-Colman, Eli
Keywords
Thermally activated delayed fluorescence
Organic light emitting diodes
Oxadiazoles
Blue emitters
DFT calculations
QD Chemistry
DAS
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Abstract
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%.
Citation
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
Publication
ACS Applied Materials & Interfaces
Status
Peer reviewed
DOI
https://doi.org/10.1021/acsami.8b11136
ISSN
1944-8244
Type
Journal article
Rights
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
Description
EZ-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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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/18433

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