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

Marsel Z. Shafikov*, Shi Tang, Christian Larsen, Michael Bodensteiner, Valery N. Kozhevnikov, Ludvig Edman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)
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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

Original languageEnglish
Pages (from-to)10672-10682
Number of pages11
JournalJournal of Materials Chemistry C
Volume7
Issue number34
Early online date12 Aug 2019
DOIs
Publication statusPublished - 14 Sep 2019

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