Tandem rigidification and π-extension as a key tool for the development of a narrow linewidth yellow hyperfluorescent OLED system

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dc.contributor.authorBartkowski, Krzysztof
dc.contributor.authorZimmermann Crocomo, Paola
dc.contributor.authorKochman, Michał Andrzej
dc.contributor.authorKumar, Dharmandra
dc.contributor.authorKubas, Adam
dc.contributor.authorData, Przemysław
dc.contributor.authorLindner, Marcin
dc.contributor.organizationInstitute of Organic Chemistry, Polish Academy of Sciencesen
dc.contributor.organizationFaculty of Chemistry, Silesian University of Technology, Gliwice, Polanden
dc.date.accessioned2022-08-04T14:37:30Z
dc.date.available2022-08-04T14:37:30Z
dc.date.issued2022-07-21
dc.descriptionVersion: Accepted Manuscripten
dc.description.abstractHyperfluorescence (HF), a relatively new phenomenon utilizing the transfer of excitons between two luminophores, requires careful pairwise tuning of molecular energy levels and is proposed to be the crucial step towards the development of new, highly effective OLED systems. To date, barely few HF yellow emitters with desired narrowband emission but moderate external quantum efficiency (EQE <20%) have been reported. This is because a systematic strategy embracing both Förster Resonance Energy Transfer (FRET) and triplet to singlet (TTS) transition as complementary mechanisms for effective exciton transfer has not yet been proposed. Herein, we present a rational approach, which allows, through subtle structural modification, a pair of compounds built from the same donor and acceptor subunits, but with varied communication between these ambipolar fragments, to be obtained. The TADF-active dopant is based on a naphthalimide scaffold linked to the nitrogen of a carbazole moiety, which through introduction of an additional bond leads not only to π-cloud enlargement, but also rigidifies and inhibits rotation of the donor. This structural change prevents TADF, and guides bandgaps and excited state energies to simultaneously pursue FRET and TTS process. New OLED devices utilizing the presented emitters show excellent external quantum efficiency (up to 27%) and narrow full width at half maximum (40nm), which is a consequence of very good alignment of energy levels. The presented design principles prove that only a minor structural modification is needed to obtain commercially applicable dyes for HF OLED devices.en
dc.description.sponsorshipNational Science of Research and Development, Poland, Grant No. LIDER/21/0077/L-11/19/NCBR/2020 European Union's Horizon 2020 research and innovation program under the Marie Skłodowska-Curie grant agreement No. 847413. National Science Centre, Poland, Grant No. 2020/39/B/ST4/01952. Polish National Science Centre funding, grant no. 2017/25/B/ST5/02488 Supporting action from EU's Horizon 2020 ERA-Chair project ExCEED, grant agreement No 952008.
dc.identifier.citationK. Bartkowski, P. Z. Crocomo, M. Kochman, D. Kumar, A. Kubas, P. Data and M. Lindner, Chem. Sci., 2022, DOI: 10.1039/D2SC03342Aen
dc.identifier.doi10.1039/D2SC03342A
dc.identifier.issn2041-6539
dc.identifier.urihttps://open.icm.edu.pl/handle/123456789/21559
dc.language.isoen
dc.publisherRoyal Society of Chemistryen
dc.rightsUznanie autorstwa-Użycie niekomercyjne 3.0 Unported*
dc.rights.urihttp://creativecommons.org/licenses/by-nc/3.0/pl/*
dc.subjecthyperfluorescenceen
dc.subjectorganic light-emitting diodesen
dc.subjectphotophysicsen
dc.subjectphotochemistryen
dc.titleTandem rigidification and π-extension as a key tool for the development of a narrow linewidth yellow hyperfluorescent OLED systemen
dc.typearticleen
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