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dc.contributor.authorHall, David
dc.contributor.authorMadayanad Suresh, Subeesh
dc.contributor.authordos Santos, Paloma Lays
dc.contributor.authorDuda, Eimantas
dc.contributor.authorBagnich, Sergey
dc.contributor.authorPershin, Anton
dc.contributor.authorPachai Gounder, Rajamalli
dc.contributor.authorCordes, David Bradford
dc.contributor.authorSlawin, Alexandra Martha Zoya
dc.contributor.authorBelijonne, David
dc.contributor.authorKöhler, Anna
dc.contributor.authorSamuel, Ifor David William
dc.contributor.authorOlivier, Yoann
dc.contributor.authorZysman-Colman, Eli
dc.date.accessioned2019-12-04T12:30:17Z
dc.date.available2019-12-04T12:30:17Z
dc.date.issued2019-12-03
dc.identifier.citationHall , D , Madayanad Suresh , S , dos Santos , P L , Duda , E , Bagnich , S , Pershin , A , Pachai Gounder , R , Cordes , D B , Slawin , A M Z , Belijonne , D , Köhler , A , Samuel , I D W , Olivier , Y & Zysman-Colman , E 2019 , ' Improving processability and efficiency of Resonant TADF emitters : a design strategy ' , Advanced Optical Materials , vol. Early View , 1901627 . https://doi.org/10.1002/adom.201901627en
dc.identifier.issn2195-1071
dc.identifier.otherPURE: 262232382
dc.identifier.otherPURE UUID: 871874a1-881d-4988-afb8-52a1db4196f2
dc.identifier.otherORCID: /0000-0002-9527-6418/work/65702388
dc.identifier.otherORCID: /0000-0002-5366-9168/work/65702469
dc.identifier.otherORCID: /0000-0001-7183-6022/work/65702620
dc.identifier.otherORCID: /0000-0001-8079-0425/work/65702683
dc.identifier.otherScopus: 85076107915
dc.identifier.otherWOS: 000500297000001
dc.identifier.urihttps://hdl.handle.net/10023/19066
dc.descriptionThis work is funded by the EC through the Horizon 2020 Marie Sklodowska-Curie ITN project TADFlife. The St Andrews team would also like to thank the Leverhulme Trust (RPG-2016- 047) and EPSRC (EP/P010482/1) for financial support. Computational resources have been provided by the Consortium des Équipements de Calcul Intensif (CÉCI), funded by the Fonds de la Recherche Scientifiques de Belgique (F.R.S.-FNRS) under Grant No. 2.5020.11, as well as the Tier-1 supercomputer of the Fédération Wallonie-Bruxelles, infrastructure funded by the Walloon Region under the grant agreement n1117545. AP acknowledges the financial support from the Marie Curie Fellowship (MILORD project, N°. 748042). DB is a FNRS Research Director. We thank Franck-Julian Kahle for support with data analysis.en
dc.description.abstractA new design strategy is introduced to address a persistent weakness with resonance thermally activated delayed fluorescence (R-TADF) emitters to reduce aggregation-caused quenching effects, which we identify as one of the key limiting factors. The emitter Mes3DiKTa shows an improved photoluminescence quantum yield of 80% compared to 75% for the reference DiKTa in 3.5 wt% mCP. Importantly, emission from aggregates, even at high doping concentrations, is eliminated and aggregation-caused quenching is strongly curtailed. For both molecules, triplets are almost quantitatively upconverted into singlets in electroluminescence, despite a significant (~0.21 eV) singlet-triplet energy gap (ΔEST), in line with correlated quantum-chemical calculations, and a slow reverse intersystem crossing. We speculate that the lattice stiffness responsible for the narrow fluorescence and phosphorescence emission spectra also protects the triplets against non-radiative decay. An improved EQEmax of 21.1% for Mes3DIKTa compared to the parent DiKTa (14.7%) and, importantly, reduced efficiency roll- off compared to literature resonance TADF OLEDs, shows the promise of this design strategy for future design of R-TADF emitters for OLED applications.
dc.language.isoeng
dc.relation.ispartofAdvanced Optical Materialsen
dc.rightsCopyright © 2019 The Authors. Published by WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.en
dc.subjectBlue emissionen
dc.subjectMultiresonance thermally activated delayed fluorescenceen
dc.subjectOrganic light emitting diodesen
dc.subjectSCS-CC2 approachen
dc.subjectQD Chemistryen
dc.subjectDASen
dc.subject.lccQDen
dc.titleImproving processability and efficiency of Resonant TADF emitters : a design strategyen
dc.typeJournal articleen
dc.contributor.sponsorEuropean Commissionen
dc.contributor.sponsorThe Leverhulme Trusten
dc.contributor.sponsorEPSRCen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Chemistryen
dc.contributor.institutionUniversity of St Andrews. Organic Semiconductor Centreen
dc.contributor.institutionUniversity of St Andrews. EaSTCHEMen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews. Centre for Biophotonicsen
dc.contributor.institutionUniversity of St Andrews. Condensed Matter Physicsen
dc.identifier.doihttps://doi.org/10.1002/adom.201901627
dc.description.statusPeer revieweden
dc.date.embargoedUntil2019-12-03
dc.identifier.grantnumber812872en
dc.identifier.grantnumberRPG-2016-047en
dc.identifier.grantnumberEP/P010482/1en


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