Shafikov, Marsel Z. and Tang, Shi and Larsen, Christian and Bodensteiner, Michael and Kozhevnikov, Valery N. 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, 2050-7534
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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).
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | DINUCLEAR IRIDIUM(III) COMPLEXES; TRANSITION-METAL-COMPLEXES; PLATINUM(II) COMPLEXES; EXCITED-STATES; TRIPLET-STATE; BASIS-SETS; POLYMER; EMISSION; PHOSPHORESCENCE; LIGANDS; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Physical Chemistry I > Prof. Dr. Patrick Nürnberger |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 30 Mar 2020 07:17 |
| Last Modified: | 06 Apr 2020 06:32 |
| URI: | https://pred.uni-regensburg.de/id/eprint/26253 |
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