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Highly efficient organic light-emitting diodes and light-emitting electrochemical cells employing multiresonant thermally activated delayed fluorescent emitters with bulky donor or acceptor peripheral groups
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dc.contributor.author | Wang, Jingxiang | |
dc.contributor.author | Hafeez, Hassan | |
dc.contributor.author | Tang, Shi | |
dc.contributor.author | Matulaitis, Tomas | |
dc.contributor.author | Edman, Ludvig | |
dc.contributor.author | Samuel, Ifor D. W. | |
dc.contributor.author | Zysman-Colman, Eli | |
dc.date.accessioned | 2024-05-03T16:30:07Z | |
dc.date.available | 2024-05-03T16:30:07Z | |
dc.date.issued | 2024-05-03 | |
dc.identifier | 301892973 | |
dc.identifier | 0ea9e409-a964-4783-ba40-305749153c67 | |
dc.identifier | 85192166923 | |
dc.identifier.citation | Wang , J , Hafeez , H , Tang , S , Matulaitis , T , Edman , L , Samuel , I D W & Zysman-Colman , E 2024 , ' Highly efficient organic light-emitting diodes and light-emitting electrochemical cells employing multiresonant thermally activated delayed fluorescent emitters with bulky donor or acceptor peripheral groups ' , Aggregate , vol. Early View , e571 . https://doi.org/10.1002/agt2.571 | en |
dc.identifier.issn | 2692-4560 | |
dc.identifier.other | RIS: urn:AE4D8299582567493AEB1D9F7143620F | |
dc.identifier.other | ORCID: /0000-0003-0470-7356/work/159009776 | |
dc.identifier.other | ORCID: /0000-0001-7183-6022/work/159011134 | |
dc.identifier.uri | https://hdl.handle.net/10023/29811 | |
dc.description | Jingxiang Wang thanks the China Scholarship Council (202006250026). We thank the Engineering and Physical Sciences Research Council (EP/R035164/1, EP/W015137/1, and EP/W007517/1) for support. Ludvig Edman and Shi Tang acknowledge financial support from the Swedish Research Council (2019-02345 and 2021–04778), the Swedish Energy Agency (50779-1 and P2021-00032), the Wallenberg Initiative Materials Science for Sustainability (WISE) funded by the Knut and Alice Wallenberg Foundation (WISE-AP01-D02), and the European Research Council for an ERC Advanced Grant (Project 101096650). | en |
dc.description.abstract | Multiresonant thermally activated delayed fluorescence (MR-TADF) emitters have been the focus of extensive design efforts as they are recognized to show bright, narrowband emission, which makes them very appealing for display applications. However, the planar geometry and relatively large singlet?triplet energy gap lead to, respectively, severe aggregation-caused quenching (ACQ) and slow reverse intersystem crossing (RISC). Here, a design strategy is proposed to address both issues. Two MR-TADF emitters triphenylphosphine oxide (TPPO)-tBu-DiKTa and triphenylamine (TPA)-tBu-DiKTa have been synthesized. Twisted ortho-substituted groups help increase the intermolecular distance and largely suppress the ACQ. In addition, the contributions from intermolecular charge transfer states in the case of TPA-tBu-DiKTa help to accelerate RISC. The organic light-emitting diodes (OLEDs) with TPPO-tBu-DiKTa and TPA-tBu-DiKTa exhibit high maximum external quantum efficiencies (EQEmax) of 24.4% and 31.0%, respectively. Notably, the device with 25 wt% TPA-tBu-DiKTa showed both high EQEmax of 28.0% and reduced efficiency roll-off (19.9% EQE at 1000 cd m?2) compared to the device with 5 wt% emitter (31.0% EQEmax and 11.0% EQE at 1000 cd m?2). The new emitters were also introduced into single-layer light-emitting electrochemical cells (LECs), equipped with air-stable electrodes. The LEC containing TPA-tBu-DiKTa dispersed at 0.5 wt% in a matrix comprising a mobility-balanced blend-host and an ionic liquid electrolyte delivered blue luminance with an EQEmax of 2.6% at 425 cd m?2. The high efficiencies of the OLEDs and LECs with TPA-tBu-DiKTa illustrate the potential for improving device performance when the DiKTa core is decorated with twisted bulky donors. | |
dc.format.extent | 12 | |
dc.format.extent | 4551148 | |
dc.language.iso | eng | |
dc.relation.ispartof | Aggregate | en |
dc.subject | Aggregation-caused quenching | en |
dc.subject | Electroluminescence | en |
dc.subject | Long-range charge transfer | en |
dc.subject | OLED | en |
dc.subject | Organic semiconductor | en |
dc.subject | Short-range charge transfer | en |
dc.subject | TADF | en |
dc.subject | DAS | en |
dc.title | Highly efficient organic light-emitting diodes and light-emitting electrochemical cells employing multiresonant thermally activated delayed fluorescent emitters with bulky donor or acceptor peripheral groups | en |
dc.type | Journal article | en |
dc.contributor.sponsor | EPSRC | en |
dc.contributor.sponsor | UK Research and Innovation | en |
dc.contributor.sponsor | EPSRC | en |
dc.contributor.institution | University of St Andrews. School of Chemistry | en |
dc.contributor.institution | University of St Andrews. School of Physics and Astronomy | en |
dc.contributor.institution | University of St Andrews. Institute of Behavioural and Neural Sciences | en |
dc.contributor.institution | University of St Andrews. Centre for Biophotonics | en |
dc.contributor.institution | University of St Andrews. Condensed Matter Physics | en |
dc.contributor.institution | University of St Andrews. Organic Semiconductor Centre | en |
dc.contributor.institution | University of St Andrews. Centre for Energy Ethics | en |
dc.contributor.institution | University of St Andrews. EaSTCHEM | en |
dc.identifier.doi | 10.1002/agt2.571 | |
dc.description.status | Peer reviewed | en |
dc.identifier.grantnumber | EP/R035164/1 | en |
dc.identifier.grantnumber | EP/W007517/1 | en |
dc.identifier.grantnumber | EP/W015137/1 | en |
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