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Exciton efficiency beyond the spin statistical limit in organic light emitting diodes based on anthracene derivatives

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dc.contributor.authorSharma, Nidhi
dc.contributor.authorWong, Michael Yin
dc.contributor.authorHall, David
dc.contributor.authorSpuling, Eduard
dc.contributor.authorTenopala Carmona, Francisco
dc.contributor.authorPrivitera, Alberto
dc.contributor.authorCopley, Graeme Jeffrey
dc.contributor.authorCordes, David Bradford
dc.contributor.authorSlawin, Alexandra Martha Zoya
dc.contributor.authorMurawski, Caroline
dc.contributor.authorGather, Malte Christian
dc.contributor.authorBeljonne, David
dc.contributor.authorOlivier, Yoann
dc.contributor.authorSamuel, Ifor D. W.
dc.contributor.authorZysman-Colman, Eli
dc.date.accessioned2021-01-28T00:37:29Z
dc.date.available2021-01-28T00:37:29Z
dc.date.issued2020-01-28
dc.identifier266073607
dc.identifiera3f7b612-83bf-4aaa-bbcd-df5e0eabf86a
dc.identifier85082297917
dc.identifier000528591300016
dc.identifier.citationSharma , N , Wong , M Y , Hall , D , Spuling , E , Tenopala Carmona , F , Privitera , A , Copley , G J , Cordes , D B , Slawin , A M Z , Murawski , C , Gather , M C , Beljonne , D , Olivier , Y , Samuel , I D W & Zysman-Colman , E 2020 , ' Exciton efficiency beyond the spin statistical limit in organic light emitting diodes based on anthracene derivatives ' , Journal of Materials Chemistry C , vol. In press . https://doi.org/10.1039/C9TC06356Ken
dc.identifier.issn2050-7526
dc.identifier.otherORCID: /0000-0002-9527-6418/work/68281330
dc.identifier.otherORCID: /0000-0002-5366-9168/work/68281387
dc.identifier.otherORCID: /0000-0002-4857-5562/work/68281562
dc.identifier.otherORCID: /0000-0001-7183-6022/work/68281577
dc.identifier.otherORCID: /0000-0002-4603-034X/work/68281621
dc.identifier.urihttps://hdl.handle.net/10023/21337
dc.descriptionE.Z.-C. acknowledges the University of St Andrews and the Leverhulme Trust (RPG- 2016-047) for financial support. E.Z.-C. and I.D.W.S. thank EPSRC (EP/P010482/1) for support. We thank EPSRC UK National Mass Spectrometry Facility at Swansea University for analytical services. The work in Mons was supported by the European Union’s Horizon 2020 research and innovation program under Grant Agreement N°. 646176 (EXTMOS project). 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. C.M. and G.C acknowledge funding by the European Commission through a Marie Skłodowska Curie fellowship (No. 703387 and 799302, respectively). M.C.G. acknowledges funding from EPSRC (EP/R010595/1). A.P. acknowledges the European Union’s Horizon 2020 research and innovation programme under Marie Sklodowska Curie Grant agreement No. 722651 (SEPOMO project). EPR measurements were performed in the Centre for Advanced ESR (CAESR), located in the Department of Chemistry of the University of Oxford, and this work was supported by the EPSRC (EP/L011972/1).en
dc.description.abstractWe report two donor-acceptor (D-A) materials based on a cyanoanthracene acceptor paired with diphenylamine ( DPAAnCN ) and carbazole ( CzAnCN ) donor moieties. These compounds show hybrid locally excited (LE) charge-transfer (CT) excited states (HLCT), which we demonstrated through a combined photophysical and computational study. Vacuum- deposited organic light emitting diodes (OLEDs) using these HLCT emitters exhibit maximum external quantum efficiencies (EQEmax) close to 6%, with impressive exciton utilization efficiency (Φs) of >50%, far exceeding the spin statistic limit of 25%. We rule out triplet-triplet annihilation and thermally activated delayed fluorescence as triplet harvesting mechanisms along with horizontal orientation of emitters to enhance light outcoupling and, instead, propose a “hot exciton” channel involving the nearly isoenergetic T2 and S1 states.
dc.format.extent6192133
dc.language.isoeng
dc.relation.ispartofJournal of Materials Chemistry Cen
dc.subjectQD Chemistryen
dc.subjectDASen
dc.subject.lccQDen
dc.titleExciton efficiency beyond the spin statistical limit in organic light emitting diodes based on anthracene derivativesen
dc.typeJournal articleen
dc.contributor.sponsorThe Leverhulme Trusten
dc.contributor.sponsorEPSRCen
dc.contributor.sponsorEPSRCen
dc.contributor.sponsorEuropean Commissionen
dc.contributor.sponsorEuropean Commissionen
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. 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.doi10.1039/C9TC06356K
dc.description.statusPeer revieweden
dc.date.embargoedUntil2021-01-28
dc.identifier.grantnumberRPG-2016-047en
dc.identifier.grantnumberEP/P010482/1en
dc.identifier.grantnumberEP/P010482/1en
dc.identifier.grantnumber703387en
dc.identifier.grantnumber799302en


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