Nanocrystalline nature of high-symmetry Ce4+-Eu3+ centers in silica gel glasses |
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Authors: | G. E. Malashkevich V. N. Sigaev G. I. Semkova B. Champagnon |
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Affiliation: | (1) Institute of Molecular and Atomic Physics, National Academy of Sciences of Belarus, pr. F. Skoriny 70, Minsk, 220072, Belarus;(2) Mendeleev University of Chemical Technology, Miusskaya pl. 9, Moscow, 125190, Russia;(3) University of Lyon-1, Villeurbanne Cedex Lyon, 69622, France |
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Abstract: | The spectral-luminescent properties of silica gel glasses coactivated by Ce4+ and Eu3+ ions are investigated. The structure of the glasses is studied using x-ray powder diffraction and small-angle neutron scattering. The inference is drawn that Ce4+-Eu3+ centers with high-symmetry Eu(III) oxo complexes, which are formed in the glasses, have nanocrystalline nature. These centers are characterized by a weak vibronic interaction of Eu3+ ions with the matrix. The size of nanocrystallites formed under the synthesis conditions and at coactivator concentrations used is approximately equal to 10 nm. |
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