Colour tuning from green to red by substituent effects in phosphorescent tris-cyclometalated iridium(III) complexes of carbazole-based ligands: Synthetic, photophysical, computational and high efficiency OLED studies

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dc.contributor.authorMoore, Tom N.
dc.contributor.authorZheng, Yonghao
dc.contributor.authorBryce, Martin R.
dc.contributor.authorFox, Mark A.
dc.contributor.authorGriffiths, Gareth C.
dc.contributor.authorJankus, Vygintas
dc.contributor.authorAl-Attar, Hameed A.
dc.contributor.authorMonkman, Andrew P.
dc.contributor.buuauthorTavaslı, Mustafa
dc.contributor.departmentUludağ Üniversitesi/Fen-Edebiyat Fakültesi/Kimya Bölümü.tr_TR
dc.contributor.orcid0000-0002-9466-1111tr_TR
dc.contributor.researcheridAAB-1630-2020tr_TR
dc.contributor.scopusid6506308760tr_TR
dc.date.accessioned2021-11-30T10:46:40Z
dc.date.available2021-11-30T10:46:40Z
dc.date.issued2012
dc.description.abstractTwo series of fac-tris-cyclometalated iridium(III) complexes, series 1 from the 2-(carbazol-3'-yl)-pyridine ligands, and series 2 from the isomeric 2-(carbazol-2'-yl)-pyridine ligands, have been characterised. The photoluminescence and electroluminescence from series 2 complexes are red shifted compared to series 1 complexes, due to the increased electron donating ability of the carbazole unit in series 2. The attachment of trifluoromethyl and methoxy substituents to the pyridyl ring in these complexes results in colour tuning of phosphorescence energy maxima over the range 494-637 nm (green to red). These complexes possess predominantly (MLCT)-M-3 (metal-to-ligand-charge transfer) excited states. DFT/TD-DFT computations correctly predict the phosphorescence emission maxima and show that the HOMOs in these complexes contain mixed iridium and carbazolyl character. The carbazolyl ligand contributions to the excited states increase in series 2 compared to series 1. Complexes of series 1 exhibit high phosphorescence quantum yields whereas complexes of series 2 show lower quantum yields. Solution processed organic light emitting devices (OLEDs) with series 1 complexes using the high triplet poly(9-vinylcarbazole) (PVK) as the host polymer exhibit very high performances of up to 40 cd A(-1) and external quantum efficiency of 12%. For series 2 the highest current efficiency is 10.3 cd A(-1) and external quantum efficiency of 5.6%.en_US
dc.description.sponsorshipUK Research & Innovation (UKRI)en_US
dc.description.sponsorshipEngineering & Physical Sciences Research Council (EPSRC) - EP/I013695/1en_US
dc.identifier.citationTavaslı, M. vd. (2012). "Colour tuning from green to red by substituent effects in phosphorescent tris-cyclometalated iridium(III) complexes of carbazole-based ligands: Synthetic, photophysical, computational and high efficiency OLED studies". Journal of Materials Chemistry, 22(13), 6419-6428.en_US
dc.identifier.endpage6428tr_TR
dc.identifier.issn0959-9428
dc.identifier.issn1364-5501
dc.identifier.issue13tr_TR
dc.identifier.scopus2-s2.0-84863229486tr_TR
dc.identifier.startpage6419tr_TR
dc.identifier.urihttps://doi.org/10.1039/c2jm15049b
dc.identifier.urihttps://pubs.rsc.org/en/content/articlelanding/2012/jm/c2jm15049b/unauth
dc.identifier.urihttp://hdl.handle.net/11452/22887
dc.identifier.volume22tr_TR
dc.identifier.wos000301195300072tr_TR
dc.indexed.scopusScopusen_US
dc.indexed.wosSCIEen_US
dc.language.isoenen_US
dc.publisherRoyal Soc Chemistryen_US
dc.relation.collaborationYurt dışıtr_TR
dc.relation.journalJournal of Materials Chemistryen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergitr_TR
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectChemistryen_US
dc.subjectMaterials scienceen_US
dc.subjectLight-emitting-diodesen_US
dc.subjectDensity-functional theoryen_US
dc.subjectElectroluminescent propertiesen_US
dc.subjectIr(III) complexesen_US
dc.subjectElectrochemical propertiesen_US
dc.subject9-arylcarbazole moietiesen_US
dc.subjectState propertiesen_US
dc.subjectIII complexesen_US
dc.subjectEmissionen_US
dc.subjectDevicesen_US
dc.subjectCharge transferen_US
dc.subjectComputational efficiencyen_US
dc.subjectExcited statesen_US
dc.subjectIridiumen_US
dc.subjectLigandsen_US
dc.subjectLight emissionen_US
dc.subjectLight emitting diodesen_US
dc.subjectPhosphorescenceen_US
dc.subjectPolycyclic aromatic hydrocarbonsen_US
dc.subjectPyridineen_US
dc.subjectQuantum efficiencyen_US
dc.subjectQuantum yielden_US
dc.subjectCarbazole unitsen_US
dc.subjectCarbazolylen_US
dc.subjectCurrent efficiencyen_US
dc.subjectElectron-donating abilityen_US
dc.subjectEmission maximaen_US
dc.subjectExternal quantum efficiencyen_US
dc.subjectHost polymersen_US
dc.subjectIridium complexen_US
dc.subjectMethoxyen_US
dc.subjectOrganic light-emitting devicesen_US
dc.subjectPhosphorescence quantum yielden_US
dc.subjectPhotophysicalen_US
dc.subjectPoly(9-vinylcarbazole)en_US
dc.subjectPyridine ligandsen_US
dc.subjectPyridyl ringsen_US
dc.subjectRed-shifteden_US
dc.subjectSolution-processeden_US
dc.subjectSubstituent effecten_US
dc.subjectTrifluoromethylen_US
dc.subjectIridium compoundsen_US
dc.subject.scopusIridium; Organic Light-emitting Diodes; 2-Phenylpyridineen_US
dc.subject.wosChemistry, physicalen_US
dc.subject.wosMaterials science, multidisciplinaryen_US
dc.titleColour tuning from green to red by substituent effects in phosphorescent tris-cyclometalated iridium(III) complexes of carbazole-based ligands: Synthetic, photophysical, computational and high efficiency OLED studiesen_US
dc.typeArticle
dc.wos.quartileQ1en_US

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