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dc.contributor.authorSi, Changfeng
dc.contributor.authorHu, Ya-Nan
dc.contributor.authorSun, Dianming
dc.contributor.authorWang, Kai
dc.contributor.authorZhang, Xiaohong
dc.contributor.authorZysman-Colman, Eli
dc.date.accessioned2023-09-11T11:30:06Z
dc.date.available2023-09-11T11:30:06Z
dc.date.issued2023-09-28
dc.identifier.citationSi , C , Hu , Y-N , Sun , D , Wang , K , Zhang , X & Zysman-Colman , E 2023 , ' The influence of nitrogen doping of the acceptor in orange–red thermally activated delayed fluorescence emitters and OLEDs ' , Journal of Materials Chemistry C , vol. 11 , no. 36 , pp. 12174-12184 . https://doi.org/10.1039/D3TC02352Den
dc.identifier.issn2050-7526
dc.identifier.otherPURE: 292982542
dc.identifier.otherPURE UUID: d23bd7da-31e8-40ac-8492-b0661525b7a6
dc.identifier.otherORCID: /0000-0001-7183-6022/work/142499561
dc.identifier.otherScopus: 85171899397
dc.identifier.urihttps://hdl.handle.net/10023/28345
dc.descriptionFunding: C. Si thanks the China Scholarship Council (201806890001). D.S acknowledges support from the Royal Academy of Engineering Enterprise Fellowship (EF2122-13106). The St Andrews team thanks EPSRC for financial support (EP/P010482/1). X.-H. Zhang acknowledges support from the National Natural Science Foundation of China (Grant Nos. 52130304, 51821002), Suzhou Key Laboratory of Functional Nano & Soft Materials, Collaborative Innovation Center of Suzhou Nano Science & Technology, the 111 Project.en
dc.description.abstractNitrogen-containing polycyclic aromatic hydrocarbons (N-PAH) have been widely used as deep lowest unoccupied molecular orbital (LUMO) acceptors in donor-acceptor (D-A) red thermally activated delayed fluorescent (TADF) emitters and their use in organic light-emitting diodes. However, most of the studies have focused disparately on donor/acceptor combinations to yield efficient emitters, while it is rare that there is a methodological study to investigate the influence of the nitrogen (N) doping ratios on the ground and excited states of PAH acceptors. Here, we report a family of four different N-PAH acceptors containing different numbers of nitrogen atoms within the N-PAH and their use in D-A TADF emitters, DMACBP, DMACPyBP, DMACBPN and DMACPyBPN, when coupled to the same donor, 9,9-dimethyl-9,10-dihydroacridine (DMAC). As the nitrogen content in the acceptor increases the LUMO becomes progressively more stabilized while the singlet-triplet energy gap (ΔEST) decreases and the rate constant for reverse intersystem crossing (kRISC) increases. In particular, introducing nitrogen at the 10-position of the dibenzo[a,c]phenazine (BP) leads to a more than ten-fold enhancement in kRISC in DMACPyBP and DMACPyBPN compared to DMACBP and DMACBPN. Among the OLEDs with all four emitters that with DMACBPN demonstrates the highest EQEmax of 19.4% at an emission peak of 588 nm. while the deepest red emitting device employed DMACPyBPN (λEL = 640 nm) with an EQEmax of 5.4%.
dc.format.extent11
dc.language.isoeng
dc.relation.ispartofJournal of Materials Chemistry Cen
dc.rightsCopyright © 2023 The Author(s). Open Access. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.en
dc.subjectQD Chemistryen
dc.subjectDASen
dc.subject.lccQDen
dc.titleThe influence of nitrogen doping of the acceptor in orange–red thermally activated delayed fluorescence emitters and OLEDsen
dc.typeJournal articleen
dc.contributor.sponsorEPSRCen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Chemistryen
dc.contributor.institutionUniversity of St Andrews. Centre for Energy Ethicsen
dc.contributor.institutionUniversity of St Andrews. EaSTCHEMen
dc.identifier.doihttps://doi.org/10.1039/D3TC02352D
dc.description.statusPeer revieweden
dc.identifier.grantnumberEP/P010482/1en


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