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dc.contributor.authorMeng, Guoyun
dc.contributor.authorLiu, Lijie
dc.contributor.authorHe, Zhechang
dc.contributor.authorHall, David
dc.contributor.authorWang, Xiang
dc.contributor.authorPeng, Tai
dc.contributor.authorYin, Xiaodong
dc.contributor.authorChen, Pangkuan
dc.contributor.authorBeljonne, David
dc.contributor.authorOlivier, Yoann
dc.contributor.authorZysman-Colman, Eli
dc.contributor.authorWang, Nan
dc.contributor.authorWang, Suning
dc.identifier.citationMeng , G , Liu , L , He , Z , Hall , D , Wang , X , Peng , T , Yin , X , Chen , P , Beljonne , D , Olivier , Y , Zysman-Colman , E , Wang , N & Wang , S 2022 , ' Multi-resonant thermally activated delayed fluorescence emitters based on tetracoordinate boron-containing PAHs : colour tuning based on the nature of chelates ' , Chemical Science , vol. Advance Article , no. 6 .
dc.identifier.otherPURE: 277693016
dc.identifier.otherPURE UUID: a972e74c-8fd5-42d5-9eda-41f561fa0e7d
dc.identifier.otherJisc: cdbba5db4e954ff18cc074351f9b2008
dc.identifier.otherORCID: /0000-0001-7183-6022/work/107718253
dc.identifier.otherWOS: 000744599000001
dc.identifier.otherScopus: 85124688776
dc.descriptionThe St Andrews team would like to thank the Leverhulme Trust (RPG-2016-047) and EPSRC (EP/P010482/1) for financial support. E. Z.-C. is a Royal Society Leverhulme Trust Senior Research fellow (SRF\R1\201089).en
dc.description.abstractMulti-resonant thermally activated delayed fluorescence (MR-TADF) materials have attracted considerable attention recently. The molecular design frequently incorporates cycloboration. However, to the best of our knowledge MR-TADF compounds containing nitrogen chelated to boron are still unknown. Reported herein is a new class of tetracoordinate boron-containing MR-TADF emitters bearing C^N^C- and N^N^N-chelating ligands. We demonstrate that the replacement of the B–C covalent bond in the C^N^C-chelating ligand by the B–N covalent bond affords an isomer, which dramatically influences the optoelectronic properties of the molecule. The resulting N^N^N-chelating compounds show bathochromically shifted absorption and emission spectra relative to C^N^C-chelating compounds. The incorporation of a tert-butylcarbazole group at the 4-position of the pyridine significantly enhances both the thermal stability and the reverse intersystem crossing rate, yet has a negligible effect on emission properties. Consequently, high-performance hyperfluorescent organic light-emitting diodes (HF-OLEDs) that utilize these molecules as green and yellow-green emitters show a maximum external quantum efficiency (ηext) of 11.5% and 25.1%, and a suppressed efficiency roll-off with an ηext of 10.2% and 18.7% at a luminance of 1000 cd m−2, respectively.
dc.relation.ispartofChemical Scienceen
dc.rightsCopyright © 2022 The Author(s). Open Access. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.en
dc.subjectQD Chemistryen
dc.titleMulti-resonant thermally activated delayed fluorescence emitters based on tetracoordinate boron-containing PAHs : colour tuning based on the nature of chelatesen
dc.typeJournal articleen
dc.contributor.sponsorThe Leverhulme Trusten
dc.contributor.sponsorThe Royal Societyen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. EaSTCHEMen
dc.contributor.institutionUniversity of St Andrews. School of Chemistryen
dc.description.statusPeer revieweden

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