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dc.contributor.authorLi, Zhaoning
dc.contributor.authorLi, Wenbo
dc.contributor.authorKeum, Changmin
dc.contributor.authorArcher, Emily
dc.contributor.authorZhao, Baomin
dc.contributor.authorSlawin, Alexandra Martha Zoya
dc.contributor.authorHuang, Wei
dc.contributor.authorGather, Malte Christian
dc.contributor.authorSamuel, Ifor David William
dc.contributor.authorZysman-Colman, Eli
dc.date.accessioned2020-09-15T23:37:27Z
dc.date.available2020-09-15T23:37:27Z
dc.date.issued2019-10-10
dc.identifier.citationLi , 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.9b08479en
dc.identifier.issn0022-3654
dc.identifier.otherPURE: 262039522
dc.identifier.otherPURE UUID: e8e65a4e-6cc7-4cf2-9586-168fe1b49749
dc.identifier.otherScopus: 85072997684
dc.identifier.otherORCID: /0000-0002-9527-6418/work/63380838
dc.identifier.otherORCID: /0000-0002-4857-5562/work/63380973
dc.identifier.otherORCID: /0000-0001-7183-6022/work/63380978
dc.identifier.otherWOS: 000490353900049
dc.identifier.urihttp://hdl.handle.net/10023/20626
dc.descriptionWe 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)en
dc.description.abstractA 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%.
dc.language.isoeng
dc.relation.ispartofJournal of Physical Chemistryen
dc.rightsCopyright © 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.9b08479en
dc.subjectOxadiazoleen
dc.subjectTADFen
dc.subjectOLEDen
dc.subjectOrientationen
dc.subjectTransition dipoleen
dc.subjectBlue emitteren
dc.subjectQD Chemistryen
dc.subjectDASen
dc.subject.lccQDen
dc.title1,3,4-oxadiazole-based deep-blue thermally activated delayed fluorescence emitters for organic light emitting diodesen
dc.typeJournal articleen
dc.description.versionPostprinten
dc.contributor.institutionUniversity of St Andrews.School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews.Organic Semiconductor Centreen
dc.contributor.institutionUniversity of St Andrews.EaSTCHEMen
dc.contributor.institutionUniversity of St Andrews.School of Chemistryen
dc.contributor.institutionUniversity of St Andrews.Sir James Mackenzie Institute for Early Diagnosisen
dc.contributor.institutionUniversity of St Andrews.Centre for Biophotonicsen
dc.contributor.institutionUniversity of St Andrews.Biomedical Sciences Research Complexen
dc.contributor.institutionUniversity of St Andrews.Condensed Matter Physicsen
dc.identifier.doihttps://doi.org/10.1021/acs.jpcc.9b08479
dc.description.statusPeer revieweden
dc.date.embargoedUntil2020-09-16


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