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dc.contributor.authorGraf, Arko
dc.contributor.authorLiehm, Philipp
dc.contributor.authorMurawski, Caroline
dc.contributor.authorHofmann, Simone
dc.contributor.authorLeo, Karl
dc.contributor.authorGather, Malte Christian
dc.date.accessioned2015-10-16T23:11:17Z
dc.date.available2015-10-16T23:11:17Z
dc.date.issued2014
dc.identifier.citationGraf , A , Liehm , P , Murawski , C , Hofmann , S , Leo , K & Gather , M C 2014 , ' Correlating the transition dipole moment orientation of phosphorescent emitter molecules in OLEDs with basic material properties ' , Journal of Materials Chemistry C , vol. Early online . https://doi.org/10.1039/C4TC00997Een
dc.identifier.issn2050-7526
dc.identifier.otherPURE: 156677296
dc.identifier.otherPURE UUID: 288d544e-5385-463c-83a7-a06d81f4979f
dc.identifier.otherScopus: 84911880555
dc.identifier.otherORCID: /0000-0002-4857-5562/work/47136412
dc.identifier.otherWOS: 000345528900008
dc.identifier.urihttp://hdl.handle.net/10023/7668
dc.descriptionThis work received funding from the ESF/EU project OrganoMechanics and the European Community's Seventh Framework Programme under Grant Agreement no. FP7 267995 (NUDEV)en
dc.description.abstractThe orientation of the emissive dipole moment of seven iridium-based phosphorescent emitter molecules commonly used in organic light-emitting diodes (OLEDs) is investigated. The orientation of Ir(ppy)3, Ir(ppy)2(acac), Ir(chpy)3, Ir(dhfpy)2(acac), Ir(BT)2(acac), Ir(MDQ)2(acac), and Ir(piq)3 is determined by measuring the angle dependent spectral radiant intensity of the transverse magnetic polarized emission from p–i–n OLEDs comprising these emitters. The experimental data are compared to the intensity calculated by a multilayer simulation method that includes the anisotropy factor describing the average dipole orientation. Surprisingly, among these molecules, Ir(ppy)3 is the only emitter showing an isotropically distributed transition dipole moment. In order to correlate our results with basic molecular properties, the permanent dipole moment and the size of the molecules are calculated by density functional theory (DFT). The dipole–dipole potential obtained for Ir(ppy)3 is more than 2.5 times larger than those for all other emitter molecules investigated here, indicating that this parameter is correlated with the transition dipole moment orientation.
dc.language.isoeng
dc.relation.ispartofJournal of Materials Chemistry Cen
dc.rights© 2014. The Royal Society of Chemistry. This is the accepted version before publication of the following article: Correlating the transition dipole moment orientation of phosphorescent emitter molecules in OLEDs with basic material properties Graf, A., Liehm, P., Murawski, C., Hofmann, S., Leo, K. & Gather, M. C. 2014 In : Journal of Materials Chemistry C.. The final publication is available at http://dx.doi.org/10.1039/C4TC00997Een
dc.subjectQC Physicsen
dc.subject.lccQCen
dc.titleCorrelating the transition dipole moment orientation of phosphorescent emitter molecules in OLEDs with basic material propertiesen
dc.typeJournal articleen
dc.description.versionPostprinten
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/10.1039/C4TC00997E
dc.description.statusPeer revieweden
dc.date.embargoedUntil2015-10-17


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