Features of the Phase Composition and Structure of Eu Doped Y2O3 Submicrospheres
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Date
2013
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Sumy State University
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Abstract
Polycrystalline, non-agglomerated nanopowders based on monosized (Y1-xEux)2O3 submicrospheres were prepared. It was shown that the annealing temperature strongly influences on the structure, mor-phology and composition of the spherical (Y1-xEux)2O3 phosphors obtained. It was found that the concentra-tion quenching effects of Eu3+ luminescence in the (Y1-xEux)2O3 spheres with 70-280 nm diameter is shifted to lower Eu3+ concentrations (x =0,02; 0,05 for 70 and 280 nm spheres respectively) compared with the mi-crocrystalline powders with similar composition (x = 0,09). The reason of this phenomenon probably is for-mation of inhomogeneous phase of (Y1-xEux)2O3 solid solution in the nanopowders with the primary location of bigger Eu3+ ions in the surface area due to active diffusion processes.
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Keywords
Solid Solution, Structure, Yttrium Oxide, Sphere, Luminescence, Segregation
Citation
Features of the Phase Composition and Structure of Eu Doped Y2O3 Submicrospheres [Текст] / O.S. Bezkrovnyi, Y.V. Yermolayeva, N.A. Matveevskaya et al.
// Nanomaterials: Applications & Properties (NAP-2013) : 3-rd International conference, Alushta, the Crimea, Ukraine, September 16-21, 2013 / Edited by: A. Pogrebnjak. - Sumy : Sumy State University, 2013. - V.2, No2. - 02PCN30