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dc.contributor.authorChen, Dongyang
dc.contributor.authorPachai, Rajamalli
dc.contributor.authorTenopala Carmona, Francisco
dc.contributor.authorCarpenter-Warren, Cameron Lewis
dc.contributor.authorCordes, David Bradford
dc.contributor.authorKeum, Changmin
dc.contributor.authorSlawin, Alexandra Martha Zoya
dc.contributor.authorGather, Malte Christian
dc.contributor.authorZysman-Colman, Eli
dc.identifier.citationChen , D , Pachai , R , Tenopala Carmona , F , Carpenter-Warren , C L , Cordes , D B , Keum , C , Slawin , A M Z , Gather , M C & Zysman-Colman , E 2019 , ' Bipyridine-containing host materials for high performance yellow thermally activated delayed fluorescence-based organic light emitting diodes with very low efficiency roll-off ' , Advanced Optical Materials , vol. Early View , 1901283 .
dc.identifier.otherPURE: 262929443
dc.identifier.otherPURE UUID: 8a54aec1-8cd1-4f6a-8b7e-73429bb91cd4
dc.identifier.otherORCID: /0000-0002-9527-6418/work/65014093
dc.identifier.otherORCID: /0000-0002-5366-9168/work/65014123
dc.identifier.otherORCID: /0000-0002-4857-5562/work/65014287
dc.identifier.otherORCID: /0000-0001-7183-6022/work/65014311
dc.identifier.otherORCID: /0000-0002-4603-034X/work/65014324
dc.identifier.otherORCID: /0000-0001-8079-0425/work/65014587
dc.identifier.otherScopus: 85075395308
dc.identifier.otherWOS: 000497597900001
dc.descriptionAuthors are grateful to the Engineering and Physical Sciences Research Council (EPSRC) for support from grants EP/P010482/1 and EP/R035164/1, and to EPSRC NSF-CBET lead agency agreement (EP/R010595/1, 1706207). Dongyang Chen thanks the China Scholarship Council (201603780001). P. Rajamalli acknowledges support from a Marie Skłodowska-Curie Individual Fellowship (MCIF; No. 749557).en
dc.description.abstractTwo bipolar host materials 3-CBPy and 4-mCBPy are reported. These hosts are structural analogs of the common host materials CBP and mCBP wherein the phenyl rings have been replaced with pyridines. The two materials possess deep HOMO and shallow LUMO levels along with sufficiently high energy S1 and T1 states that make them suitable hosts for yellow emitters in electroluminescent devices. Yellow-emitting thermally activated delayed fluorescence (TADF) organic light-emitting diodes (OLEDs) were fabricated using 2,4,6-tris(4-(10H-phenoxazin-10-yl)phenyl)-1,3,5-triazine (tri-PXZ-TRZ) as the dopant emitter with either 3-CBPy or 4-mCBPy employed as the host. Their device performance was compared to analogous devices using CBP and mCBP as host materials. The pyridine-containing host devices showed markedly improved external quantum efficiencies (EQE) and decreased roll-off. The 7 wt% tri-PXZ-TRZ-doped device exhibited very low turn-on voltage (2.5 V for both 3-CBPy and 4-mCBPy ) along with maximum external quantum efficiencies (EQEmax) reaching 15.6% (for 3-CBPy ) and 19.4% (for 4-mCBPy ). The device using 4-mCBPy also exhibited very low efficiency roll-off with an EQE of 16.0% at a luminance of 10,000 cd m-2.
dc.relation.ispartofAdvanced Optical Materialsen
dc.rightsCopyright © 2019 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the final published version of the work, which was originally published at
dc.subjectAmbipolar hostsen
dc.subjectEfficiency roll-offen
dc.subjectOrganic light emitting diodesen
dc.subjectThermally activated delayed fluorescenceen
dc.subjectQD Chemistryen
dc.titleBipyridine-containing host materials for high performance yellow thermally activated delayed fluorescence-based organic light emitting diodes with very low efficiency roll-offen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews.School of Chemistryen
dc.contributor.institutionUniversity of St Andrews.Organic Semiconductor Centreen
dc.contributor.institutionUniversity of St Andrews.School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews.EaSTCHEMen
dc.contributor.institutionUniversity of St Andrews.Sir James Mackenzie Institute for Early Diagnosisen
dc.contributor.institutionUniversity of St Andrews.Centre for Biophotonicsen
dc.contributor.institutionUniversity of St Andrews.Biomedical Sciences Research Complexen
dc.description.statusPeer revieweden

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