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An efficient heterodinuclear Ir(III)/Pt(II) complex: synthesis, photophysics and application in light-emitting electrochemical cells
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0003-1274-5918
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0002-2480-3786
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2019 (English)In: Journal of Materials Chemistry C, ISSN 2050-7526, E-ISSN 2050-7534, Vol. 7, no 34, p. 10672-10682Article in journal (Refereed) Published
Abstract [en]

We report on the design, synthesis, characterization and successful application of a heterodinuclear Ir(III)/Pt(II) complex endowed with two 4,6-diphenylpyrimidine ligands and two acetylacetonate ligands, with one of the former being the rigid bridging unit between the two metal centers. The heterodinuclear complex exhibits red phosphorescence with a high quantum yield of Phi(PL) = 85% and a short room-temperature decay time of tau = 640 ns in degassed toluene solution. The high efficiency of the spin-forbidden T-1 -> S-0 transition is demonstrated to originate in a strong spin-orbit coupling of the T-1 state with a manifold of excited singlet states, which contributes to the record-breaking zero-field splitting of the T-1 state of 240 cm(-1). The high-solubility and non-ionic hetero-dinuclear complex was employed as the emissive guest compound in host-guest light-emitting electrochemical cells, and such optimized devices delivered vibrant red emission (lambda(peak) = 615 nm) with a second-fast turn-on and a high external quantum efficiency of 2.7% at a luminance of 265 cd m(-2).

Place, publisher, year, edition, pages
ROYAL SOC CHEMISTRY , 2019. Vol. 7, no 34, p. 10672-10682
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:umu:diva-164505DOI: 10.1039/c9tc02930cISI: 000483684600026OAI: oai:DiVA.org:umu-164505DiVA, id: diva2:1372307
Available from: 2019-11-22 Created: 2019-11-22 Last updated: 2019-11-22Bibliographically approved

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Tang, ShiLarsen, ChristianEdman, Ludvig

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