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2008

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Yu. V. YERMOLAYEVA, M. V. DOBROTVORS’KA, V. L. KARBIVSKYY, T. I. KORSHIKOVA, and A. V. TOLMACHEV
«Morphology of Lu2О3 Nanocrystalline Coatings on Spherical Particles of Silica»
829–838 (2008)

PACS numbers: 61.46.Df, 61.46.Hk, 68.37.Hk, 68.37.Lp, 81.07.Bc, 81.16.Pr, 82.80.Pv

Nanocrystalline Lu2O3 coatings on the nanosized spherical amorphous SiO2 particles are obtained for the first time by the sol–gel technique from water solutions forming the ‘core–shell’ SiO2/Lu2O3 heteroparticles. The morphology and geometrical parameters of SiO2/Lu2O3 heteroparticles as well as structure, continuity and phase composition of Lu2O3 coatings are determined by electron microscopy, x-ray photoelectron spectroscopy (XPS) and x-ray diffraction (XRD) methods. As shown, the Lu2O3 coatings on the SiO2 spheres consist of individual 15 nm nanocrystals or uniform nanocrystalline layers with the thickness in the range of 15–50 nm depending on synthesis conditions and the number of deposition cycles. Obtained nanocrystalline Lu2O3 coatings with the cubic crystalline structure are promising as a host lattices for activation by rare-earth ions (Еu3?, Er3?, Yb3?) for the fabrication of new-type effective spherical phosphors for visible and near-IR spectral ranges.

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