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1,3,4-oxadiazole-based deep-blue thermally activated delayed fluorescence emitters for organic light emitting diodes

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OXD_manuscript_final.pdf (3.891Mb)
Date
10/10/2019
Author
Li, Zhaoning
Li, Wenbo
Keum, Changmin
Archer, Emily
Zhao, Baomin
Slawin, Alexandra Martha Zoya
Huang, Wei
Gather, Malte Christian
Samuel, Ifor David William
Zysman-Colman, Eli
Funder
EPSRC
EPSRC
EPSRC
EPSRC
Grant ID
EP/P010482/1
EP/J01771X/1
EP/R035164/1
EP/P010482/1
Keywords
Oxadiazole
TADF
OLED
Orientation
Transition dipole
Blue emitter
QD Chemistry
DAS
Metadata
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Abstract
A series of four 1,3,4-oxadiazole-based thermally activated delayed fluorescence (TADF) derivatives are reported as emitters for organic light emitting diodes (OLEDs). As a function of the nature of the substituent on the weak 1,3,4-oxadiazole acceptor their emission color could be tuned from green-blue to blue. The highly twisted conformation between carbazoles and oxadiazoles results in effective separation of the HOMO and the LUMO resulting in a small singlet-triplet splitting. The corresponding singlet-triplet energy gaps (∆EST) range from 0.22 to 0.28 eV resulting in an efficient reverse intersystem crossing (RISC) process and moderate to high photoluminescence quantum yields (ΦPL), ranging from 35 to 70% in a DPEPO matrix. Organic light-emitting diodes (OLEDs) based on i-2CzdOXD4CF3Ph achieve maximum external quantum efficiency (EQEmax) of up to 12.3% with a sky-blue emission at CIE of (0.18, 0.28) while the device based on i-2CzdOXDMe shows blue emission at CIE of (0.17, 0.17) with a maximum EQE of 11.8%.
Citation
Li , Z , Li , W , Keum , C , Archer , E , Zhao , B , Slawin , A M Z , Huang , W , Gather , M C , Samuel , I D W & Zysman-Colman , E 2019 , ' 1,3,4-oxadiazole-based deep-blue thermally activated delayed fluorescence emitters for organic light emitting diodes ' , Journal of Physical Chemistry , vol. 123 , no. 40 , pp. 24772-24785 . https://doi.org/10.1021/acs.jpcc.9b08479
Publication
Journal of Physical Chemistry
Status
Peer reviewed
DOI
https://doi.org/10.1021/acs.jpcc.9b08479
ISSN
0022-3654
Type
Journal article
Rights
Copyright © 2019 American Chemical Society. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1021/acs.jpcc.9b08479
Description
We are grateful to the EPSRC for financial support (grants EP/P010482/1, EP/J01771X, EP/J00916 and EP/R035164/1). We gratefully acknowledge funding through the EPSRC NSF- CBET lead agency agreement (EP/R010595/1, 1706207) and a Leverhulme Trust Research Grant (RPG-2017-231). We thank the EPSRC UK National Mass Spectrometry Facility at Swansea University for analytical services. Z.L. and W. L. thank the China Scholarship Council (grant numbers 201703780004 and 201708060003)
Collections
  • University of St Andrews Research
URI
http://hdl.handle.net/10023/20626

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