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dc.contributor.authorHofmann, Simone
dc.contributor.authorHummert, Markus
dc.contributor.authorScholz, Reinhard
dc.contributor.authorLuschtinetz, Regina
dc.contributor.authorMurawski, Caroline
dc.contributor.authorWill, Paul Anton
dc.contributor.authorHintschich, Susanne
dc.contributor.authorAlex, Jörg
dc.contributor.authorJankus, Vygintas
dc.contributor.authorMonkman, Andrew P
dc.contributor.authorLüssem, Björn
dc.contributor.authorLeo, Karl
dc.contributor.authorGather, Malte Christian
dc.identifier.citationHofmann , S , Hummert , M , Scholz , R , Luschtinetz , R , Murawski , C , Will , P A , Hintschich , S , Alex , J , Jankus , V , Monkman , A P , Lüssem , B , Leo , K & Gather , M C 2014 , ' Engineering blue fluorescent bulk emitters for OLEDs : triplet harvesting by green phosphors ' , Chemistry of Materials , vol. 26 , no. 7 , pp. 2414-2426 .
dc.identifier.otherORCID: /0000-0002-4857-5562/work/47136449
dc.descriptionThis work is supported by funding from the European Community’s Seventh Framework Programme under grant FP7-224122 (
dc.description.abstractTriplet harvesting in organic light-emitting diodes (OLEDs) from a blue fluorescent to a green phosphorescent emitter is important for the development of highly efficient white OLEDs for lighting applications. Here, we report new blue fluorescent bulk emitters with high triplet energies for triplet harvesting in OLEDs. Based on the chemical structure of the highly efficient blue emitter N,N′-di-1-naphthalenyl-N,N′-diphenyl-[1,1′:4′,1″:4″,1‴-quaterphenyl]-4,4‴ diamine (4P-NPD), two new quarterphenylene compounds are designed and synthesized. Their experimentally obtained ionization potentials, singlet, and triplet levels are compared to quantum chemical calculations. We show that the incorporation of repulsive methyl groups leads to a twist of the outer phenyl rings of the molecule and increases the triplet level. Finally, triplet harvesting OLEDs comprising these two new compounds as bulk emittersare electrically and optically characterized. We demonstrate that both materials allow triplet harvesting by the green phosphorescent emitter iridium(III)bis(2-phenylpyridinato-N,C2′)acetylacetonate (Ir(ppy)2(acac)).
dc.relation.ispartofChemistry of Materialsen
dc.subjectOrganic light‐emitting diodeen
dc.subjectTriplet harvestingen
dc.subjectBlue fluorescent emitteren
dc.subjectQD Chemistryen
dc.subjectQC Physicsen
dc.titleEngineering blue fluorescent bulk emitters for OLEDs : triplet harvesting by green phosphorsen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews. Biomedical Sciences Research Complexen
dc.description.statusPeer revieweden

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