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dc.contributor.authorMurawski, Caroline
dc.contributor.authorFuchs, Cornelius
dc.contributor.authorHofmann, Simone
dc.contributor.authorLeo, Karl
dc.contributor.authorGather, Malte C.
dc.date.accessioned2015-06-30T11:40:04Z
dc.date.available2015-06-30T11:40:04Z
dc.date.issued2014-09-15
dc.identifier.citationMurawski , C , Fuchs , C , Hofmann , S , Leo , K & Gather , M C 2014 , ' Alternative p-doped hole transport material for low operating voltage and high efficiency organic light-emitting diodes ' , Applied Physics Letters , vol. 105 , no. 11 , 113303 . https://doi.org/10.1063/1.4896127en
dc.identifier.issn0003-6951
dc.identifier.otherPURE: 157831697
dc.identifier.otherPURE UUID: 0469c857-49d1-46c1-aba6-42b34e77d6d0
dc.identifier.otherWOS: 000342995800083
dc.identifier.otherScopus: 84907228966
dc.identifier.otherORCID: /0000-0002-4857-5562/work/47136425
dc.identifier.otherWOS: 000342995800083
dc.identifier.urihttp://hdl.handle.net/10023/6878
dc.descriptionThis work received funding from the European Community Seventh Framework Programme under Grant Agreement No. FP7 267995 (NUDEV) and from the European Social Fund and the free state of Saxony through the OrganoMechanics project.en
dc.description.abstractWe investigate the properties of N,N'-[(Diphenyl-N,N'-bis) 9,9,-dimethyl-fluoren-2-yl]-benzidine (BF-DPB) as hole transport material (HTL) in organic light-emitting diodes (OLEDs) and compare BF-DPB to the commonly used HTLs N,N,N',N'-tetrakis(4-methoxyphenyl)-benzidine (MeO-TPD), 2,2',7,7'-tetrakis(N,N'-di-p-methylphenylamino)-9,9'-spirobifluorene (Spiro-TTB), and N, N'-di(naphtalene-1-yl)-N,N'-diphenylbenzidine (NPB). The influence of 2,2'-(perfluoronaphthalene-2,6-diylidene)dimalononitrile (F6-TCNNQ p-dopant) concentration in BF-DPB on the operation voltage and efficiency of red and green phosphorescent OLEDs is studied; best results are achieved at 4 wt. % doping. Without any light extraction structure, BF-DPB based red (green) OLEDs achieve a luminous efficacy of 35.1 lm/W (74.0 lm/W) at 1000 cd/m(2) and reach a very high brightness of 10 000 cd/m(2) at a very low voltage of 3.2 V (3.1 V). We attribute this exceptionally low driving voltage to the high ionization potential of BF-DPB which enables more efficient hole injection from BF-DPB to the adjacent electron blocking layer. The high efficiency and low driving voltage lead to a significantly lower luminous efficacy roll-off compared to the other compounds and render BF-DPB an excellent HTL material for highly efficient OLEDs. 
dc.format.extent5
dc.language.isoeng
dc.relation.ispartofApplied Physics Lettersen
dc.rightsCopyright 2014 AIP Publishing LLC. Alternative p-doped hole transport material for low operating voltage and high efficiency organic light-emitting diodes Murawski, C., Fuchs, C., Hofmann, S., Leo, K. & Gather, M. C. 15 Sep 2014 In : Applied Physics Letters. 105, 11, 5 p.113303 available from http://scitation.aip.org/content/aip/journal/apl/105/11/10.1063/1.4896127en
dc.subjectElectroluminescent devicesen
dc.subjectRoll-offen
dc.subjectLayersen
dc.subjectDopantsen
dc.subjectQC Physicsen
dc.subject.lccQCen
dc.titleAlternative p-doped hole transport material for low operating voltage and high efficiency organic light-emitting diodesen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews.School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews.Biomedical Sciences Research Complexen
dc.identifier.doihttps://doi.org/10.1063/1.4896127
dc.description.statusPeer revieweden


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