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dc.contributor.authorStavrou, Kleitos
dc.contributor.authorMadayanad Suresh, Subeesh
dc.contributor.authorHall, David
dc.contributor.authorDanos, Andrew
dc.contributor.authorKukhta, Nadzeya A.
dc.contributor.authorSlawin, Alexandra M. Z.
dc.contributor.authorWarriner, Stuart
dc.contributor.authorBeljonne, David
dc.contributor.authorMonkman, Andrew
dc.contributor.authorZysman-Colman, Eli
dc.identifier.citationStavrou , K , Madayanad Suresh , S , Hall , D , Danos , A , Kukhta , N A , Slawin , A M Z , Warriner , S , Beljonne , D , Monkman , A & Zysman-Colman , E 2022 , ' Emission and absorption tuning in TADF B,N-doped heptacenes : towards ideal-blue hyperfluorescent OLEDs ' , Advanced Optical Materials , vol. 10 , no. 17 , 2200688 .
dc.identifier.otherPURE: 279513281
dc.identifier.otherPURE UUID: 84f10fe4-0db7-484a-82bf-f83144c5ae8a
dc.identifier.otherORCID: /0000-0002-9527-6418/work/114641358
dc.identifier.otherORCID: /0000-0001-7183-6022/work/114641569
dc.identifier.otherScopus: 85131782811
dc.identifier.otherWOS: 000810565400001
dc.descriptionThis project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska Curie grant agreement No 838885 (NarrowbandSSL) and under the Marie Skłodowska Curie grant agreement No 812872 (TADFlife). S.M.S. acknowledges support from the Marie Skłodowska-Curie Individual Fellowship (grant agreement No 838885 NarrowbandSSL). The St. Andrews team would like to thank the Leverhulme Trust (RPG-2016-047) for financial support. E. Z.-C. is a Royal Society Leverhulme Trust Senior Research fellow (SRF\R1\201089). 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 n 1117545.en
dc.description.abstractDeveloping high-efficiency purely organic blue organic light-emitting diodes (OLEDs) that meet the stringent industry standards is a major current research challenge. Hyperfluorescent device approaches achieve in large measure the desired high performance by combining the advantages of a high-efficiency thermally activated delayed fluorescence (TADF) assistant dopant with a narrowband deep-blue multi-resonant TADF (MR-TADF) terminal emitter. However, this approach requires suitable spectral overlap to support Förster resonance energy transfer (FRET) between the two. Here, a color tuning of a recently reported MR-TADF B,N-heptacene core through control of the boron substituents is demonstrated. While there is little impact on the intrinsic TADF properties—as both singlet and triplet energies decrease in tandem—this approach improves the emission color coordinate as well as the spectral overlap for blue hyperfluorescence OLEDs (HF OLEDs). Crucially, the red-shifted and more intense absorption allows the new MR-TADF emitter to pair with a high-performance TADF assistant dopant and achieve maximum external quantum efficiency (EQEmax) of 15% at color coordinates of (0.15 and 0.10). The efficiency values recorded for the device at a practical luminance of 100 cd m–2 are among the highest reported for HF TADF OLEDs with CIEy ≤ 0.1.
dc.relation.ispartofAdvanced Optical Materialsen
dc.rightsCopyright © 2022 The Authors. Advanced Optical Materials published by Wiley-VCH GmbH. 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.subjectMulti-resonant thermally activated delayed fluorescenceen
dc.subjectOrganic light-emitting diodesen
dc.subjectQD Chemistryen
dc.titleEmission and absorption tuning in TADF B,N-doped heptacenes : towards ideal-blue hyperfluorescent OLEDsen
dc.typeJournal articleen
dc.contributor.sponsorEuropean Commissionen
dc.contributor.sponsorEuropean Commissionen
dc.contributor.sponsorThe Leverhulme Trusten
dc.contributor.sponsorThe Royal Societyen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Chemistryen
dc.contributor.institutionUniversity of St Andrews. EaSTCHEMen
dc.contributor.institutionUniversity of St Andrews. Centre for Energy Ethicsen
dc.description.statusPeer revieweden

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