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dc.contributor.authorSun, Dianming
dc.contributor.authorDuda, Eimantas
dc.contributor.authorFan, Xiaochun
dc.contributor.authorSaxena, Rishabh
dc.contributor.authorZhang, Ming
dc.contributor.authorBagnich, Sergey
dc.contributor.authorZhang, Xiao-Hong
dc.contributor.authorKoehler, Anna
dc.contributor.authorZysman-Colman, Eli
dc.identifier.citationSun , D , Duda , E , Fan , X , Saxena , R , Zhang , M , Bagnich , S , Zhang , X-H , Koehler , A & Zysman-Colman , E 2022 , ' Thermally activated delayed fluorescent dendrimers that underpin high-efficiency host-free solution-processed organic light emitting diodes ' , Advanced Materials , vol. 34 , no. 23 , 2110344 .
dc.identifier.otherPURE: 278643430
dc.identifier.otherPURE UUID: e43843cf-2510-4a74-9880-12de641f048c
dc.identifier.otherORCID: /0000-0001-7183-6022/work/112711451
dc.identifier.otherWOS: 000789313900001
dc.identifier.otherScopus: 85129143199
dc.descriptionThis project has received funding from the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie grant agreements No. 838009 (TSFP) and No 812872 (TADFlife). D.S. acknowledges support from the Marie Skłodowska-Curie Individual Fellowship (TSFP), the National Postdoctoral Program for Innovative Talents (BX201700164), and the Jiangsu Planned Projects for Postdoctoral Research Funds (2018K011A). S.B. acknowledges support from the German Science Foundation (392306670/HU2362). The St Andrews team thank the Leverhulme Trust (RPG2016047) and EPSRC (EP/P010482/1) for financial support. X.Z. would like to thank the support from the National Key Research & Development Program of China (Grant No. 2020YFA0714601, 2020YFA0714604), the National Natural Science Foundation of China (Grant No. 52130304, 51821002), Suzhou Key Laboratory of Functional Nano & Soft Materials, Collaborative Innovation Center of Suzhou Nano Science & Technology, the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), the 111 Project, Joint International Research Laboratory of Carbon-Based Functional Materials and Devices. E. Z.-C. is a Royal Society Leverhulme Trust Senior Research fellow (SRF\R1\201089).en
dc.description.abstractThe development of high-performance solution-processed organic light-emitting diodes (OLEDs) remains a challenge. An effective solution, highlighted in this work, is to use highly efficient thermally activated delayed fluorescence (TADF) dendrimers as emitters. Here, the design, synthesis, density functional theory (DFT) modeling, and photophysics of three triazine-based dendrimers, tBuCz2pTRZ , tBuCz2mTRZ , and tBuCz2m2pTRZ , is reported, which resolve the conflicting requirements of achieving simultaneously a small ΔEST and a large oscillator strength by incorporating both meta- and para-connected donor dendrons about a central triazine acceptor. The solution-processed OLED containing a host-free emitting layer exhibits an excellent maximum external quantum efficiency (EQEmax) of 28.7%, a current efficiency of 98.8 cd A−1, and a power efficiency of 91.3 lm W−1. The device emits with an electroluminescence maximum, λEL, of 540 nm and Commission International de l'Éclairage (CIE) color coordinates of (0.37, 0.57). This represents the most efficient host-free solution-processed OLED reported to date. Further optimization directed at improving the charge balance within the device results in an emissive layer containing 30 wt% OXD-7, which leads to an OLED with the similar EQEmax of 28.4% but showing a significantly improved efficiency rolloff where the EQE remains high at 22.7% at a luminance of 500 cd m−2.
dc.relation.ispartofAdvanced Materialsen
dc.rightsCopyright © 2022 The Authors. Advanced 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.subjectTADF dendrimersen
dc.subjectHost-free OLEDsen
dc.subjectExternal quantum efficiencyen
dc.subjectQD Chemistryen
dc.titleThermally activated delayed fluorescent dendrimers that underpin high-efficiency host-free solution-processed organic light emitting diodesen
dc.typeJournal articleen
dc.contributor.sponsorEuropean Commissionen
dc.contributor.sponsorEuropean Commissionen
dc.contributor.sponsorThe Royal Societyen
dc.contributor.sponsorThe Leverhulme Trusten
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. Centre for Energy Ethicsen
dc.contributor.institutionUniversity of St Andrews. EaSTCHEMen
dc.contributor.institutionUniversity of St Andrews. School of Chemistryen
dc.description.statusPeer revieweden

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