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- W2079734199 abstract "A series of inert and photostable encapsulated lanthanide(III) complexes—based on dendritic anthracene ligands—is shown for the first time to exhibit strong near-IR emission bands via efficient energy transfer from the excited states of the peripheral antenna to the Ln3+ ions (Er3+, Yb3+, and Nd3+). A significant decrease in the fluorescence of the anthracene ligand is accompanied by a strong increase in the near-IR emission of the Ln3+ ions. The near-IR emission intensities of Ln3+ ions in the encapsulated Ln3+–dendrimer complexes are dramatically enhanced on increasing the generation number (n) of dendrons, owing to site-isolation and light-harvesting effects. Furthermore, a first attempt is made to distinguish between the site-isolation and light-harvesting effects in the present complexes. Photophysical studies indicate the sensitization of Ln3+ luminescence by energy transfer through the excited singlet state of the anthracene ligands, and the energy-transfer efficiency between the dendritic anthracene ligands and the Ln3+ ion is evaluated to be in the range of 90 to 97 %. Their energy-transfer efficiency is in good agreement with the result that the biexponential decays contain a radiative decay of anthracene units (< ca. 10 %) and an energy-transfer component (> ca. 90 %) from the excited state of anthracene ligands to the Ln3+ ions. Time-resolved luminescence spectra show monoexponential decays with a lifetime of 2 μs for the Er3+ ion 11 μs for the Yb3+ ion and 0.7 μs for the Nd3+ ion in thin films, and calculated intrinsic quantum yields of the Ln3+ ions are in the range of ca. 0.025 to 0.55 %." @default.
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- W2079734199 date "2006-09-18" @default.
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- W2079734199 title "The First Inert and Photostable Encapsulated Lanthanide(III) Complexes Based on Dendritic 9,10-Diphenylanthracene Ligands: Synthesis, Strong Near-Infrared Emission Enhancement, and Photophysical Studies" @default.
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- W2079734199 doi "https://doi.org/10.1002/adfm.200500835" @default.
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