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- W2801132373 abstract "Abstract A series of substituted 2‐phenylquinoxaline ligands have been explored to finely tune the visible emission properties of a corresponding set of cationic, cyclometallated iridium(III) complexes. The electronic and redox properties of the complexes were investigated through experimental (including time‐resolved luminescence and transient absorption spectroscopy) and theoretical methods. The complexes display absorption and phosphorescent emissions in the visible region that are attributed to metal to ligand charge‐transfer transitions. The different substitution patterns of the ligands induce variations in these parameters. Time‐dependent DFT studies support these assignments and show that there is likely to be a strong spin‐forbidden contribution to the visible absorption bands at λ =500–600 nm. Calculations also reliably predict the magnitude and trends in triplet emitting wavelengths for the series of complexes. The complexes were assessed as potential sensitisers in triplet–triplet annihilation upconversion experiments by using 9,10‐diphenylanthracene as the acceptor; the methylated variants performed especially well with impressive upconversion quantum yields of up to 39.3 %." @default.
- W2801132373 created "2018-05-17" @default.
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- W2801132373 date "2018-06-07" @default.
- W2801132373 modified "2023-10-15" @default.
- W2801132373 title "Ligand‐Tuneable, Red‐Emitting Iridium(III) Complexes for Efficient Triplet–Triplet Annihilation Upconversion Performance" @default.
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- W2801132373 doi "https://doi.org/10.1002/chem.201801007" @default.
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