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The sol-gel powders doubly-doped with Gd3+/Eu3+ ions with different concentration of Gd3+ have been successfully obtained. The spectroscopic characterization of prepared samples was conducted based on excitation and emission spectra as well as luminescence decay analysis. Upon direct excitation of Eu3+ active ions, the characteristic 5D0 → 7F1 (orange) and 5D0 → 7F2 (red) emission bands were observed...
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