Features of the Phase Composition and Structure of Eu Doped Y2O3 Submicrospheres

Polycrystalline, non-agglomeratednanopowders based on monosized (Y1-xEux)2O3submicrospheres were prepared. It was shown that the annealing temperaturestrongly influences on the structure, morphology and composition of thespherical (Y1-xEux)2O3 phosphorsobtained. It was found that the concentration quenching effects of Eu3+luminescence in the (Y1-xEux)2O3spheres with 70-280 nm diameter is shifted to lower Eu3+concentrations (x =0,02; 0,05 for 70 and 280 nm spheres respectively) comparedwith the microcrystalline powders with similar composition (x = 0,09). The reasonof this phenomenon probably is formation of inhomogeneous phase of (Y1-xEux)2O3solid solution in the nanopowders with the primary location of bigger Eu3+ions in the surface area due to active diffusion processes.