Abstract
The silica sol-gel derived glasses co-doped with Cu<sub>x</sub>O and Cu<sub>x</sub>Se nanoparticles and Eu<sup>3+</sup> ions have been fabricated. The analysis of luminescence spectra of a series of glasses with different composition allows us to suppose the direct energy transfer between copper oxide nanoparticle and Eu<sup>3+</sup> ion. A luminescence signal of europium ions occurs as the result of excitation of the complex active centres (SiO<sub>2</sub>:Cu<sub>2</sub>O:Eu<sup>3+</sup>) in the absorption range of copper oxide.
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