Eu3+ luminescence and Gd3+-Eu3+ energy transfer in K5Li2GdF10:Eu3+ |
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Authors: | W. Ryba-Romanowski S. Gołvab G. Dominiak-Dzik P. Solarz |
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Affiliation: | (1) Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wrocław, Poland, PL |
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Abstract: | Polycrystalline samples of europium-doped K5Li2GdF10 have been obtained by a slow cooling of melted compound and investigated using spectroscopy methods. Luminescence from the 5 D 2 level of Eu3+ is found to be weak. Intense visible emission upon excitation into the 5 D 2 or higher energy levels has been attributed to overlapping transitions from long-lived 5 D 1 and 5 D 0 levels. A strong increase of the 5 D 0 emission at the expense of the 5 D 1 emission occurs between 5 K and 25 K without significant change of the 5 D 1 lifetime. To account for this, it is supposed that both the radiative and the nonradiative transition rates are temperature-dependent. Efficient energy transfer from the 6 G J levels of Gd3+ to Eu3+ ions has been evidenced by excitation spectra in the VUV region and VUV-excited luminescence. It has been concluded that the cross relaxation contributes to the energy-transfer process. Received: 8 May 2001 / Accepted: 11 May 2001 / Published online: 25 July 2001 |
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Keywords: | PACS: 78.50.-w 78.55.-m |
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