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- W2004117670 abstract "The photophysical properties (absorption, emission, and excitation spectra; luminescence quantum yields; luminescence decay lifetimes ) of K13[Eu(SiW11O39)2] and K15[Eu(BW11O39)2] in aqueous solution and in the solid state are reported. Both complexes exhibit broad and very intense O → W charge transfer bands in the U.V. region and weak and narrow f → f Eu3+ bands in the visible. At 77 K the luminescence emission of both complexes, which consists of 5DO → 7FJ bands split by the local crystal field, can be pumped very efficiently via both the O → W CT and the f → f Eu3+ levels, whereas at 298 K only pumping via the f → f Eu3+ is efficient. The values of the luminescence decay lifetimes in H2O and D2O solution are quite similar, showing that no water molecule is coordinated to the central Eu3+ ion. The high resolution emission spectra are discussed in an attempt to define the coordination symmetry of Eu3+." @default.
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- W2004117670 date "1984-12-01" @default.
- W2004117670 modified "2023-09-27" @default.
- W2004117670 title "Photophysical properties of Eu(SiW11O39)213− and Eu(BW11O39)215−" @default.
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- W2004117670 doi "https://doi.org/10.1016/s0020-1693(00)84901-4" @default.
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