An efficient heterodinuclear Ir(iii)/Pt(ii) complex: synthesis, photophysics and application in light-emitting electrochemical cells

Shafikov, Marsel Z., Tang, Shi, Larsen, Christian, Bodensteiner, Michael, Kozhevnikov, Valery and Edman, Ludvig (2019) An efficient heterodinuclear Ir(iii)/Pt(ii) complex: synthesis, photophysics and application in light-emitting electrochemical cells. Journal of Materials Chemistry C, 7 (34). pp. 10672-10682. ISSN 2050-7526

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Abstract

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 ΦPL = 85% and a short room-temperature decay time of τ = 640 ns in degassed toluene solution. The high efficiency of the spin-forbidden T1 → S0 transition is demonstrated to originate in a strong spin-orbit coupling of the T1 state with a manifold of excited singlet states, which contributes to the record-breaking zero-field splitting of the T1 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 (λpeak = 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

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