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Yermolayeva Y.,Scientific and Technological Corporation | Tolmachev A.,Scientific and Technological Corporation | Tkachenko V.,Scientific and Technological Corporation | Danylenko N.,Frantsevich Institute for Problems of Materials Science | Fedaruk R.,University Of Szczecin
Journal of Crystal Growth | Year: 2011

Monodisperse Lu2O3:Eu3+ submicrospheres with the diameters ranging from 40 to 400 nm were obtained by the urea-based homogeneous precipitation technique with subsequent spheres crystallization during annealing. The inner structure, morphology of Lu2O 3:Eu3+ polycrystalline spheres and thermal stability of the particles shape were investigated by means of transmission electron microscopy (TEM), X-ray diffractometry (XRD) and electron paramagnetic resonance (EPR). Eu3+-doped lutetium oxide spheres were characterized by effective luminescence under X-ray excitation in the λ=575725 nm range corresponding to 5D0→7FJ transitions (J=04) of Eu3+ ions. Experimental data showed that the X-ray luminescence efficiency increases with the increase of the crystallites size, which occurred by the annealing temperature and particles diameter. © 2011 Elsevier B.V. All rights reserved. Source


Yermolayeva Y.V.,Scientific and Technological Corporation | Tolmachev A.V.,Scientific and Technological Corporation | Dobrotvorskaya M.V.,Scientific and Technological Corporation | Vovk O.M.,Scientific and Technological Corporation
Journal of Alloys and Compounds | Year: 2011

Monodisperse non-agglomerated Lu2O3:Eu3+ submicrometer spheres were obtained by the homogeneous precipitation technique with subsequent annealing for spheres crystallization. The morphological and structural parameters of the Lu2O3:Eu3+ crystalline spheres prepared were investigated by the electron microscopy methods, thermal analysis (TG-DTA), X-ray diffractometry (XRD), X-ray photoelectron (XPS) and FT-IR spectroscopy. The influence of the annealing temperature on the morphology and sphericity was shown. Eu3+-doped lutetium oxide spheres were characterized by effective luminescence under X-ray excitation in the λ = 575-725 nm range corresponding to 5D0 → 7FJ transitions (J = 0-4) of Eu3+ ions. It was shown that the X-ray luminescence efficiency of the Lu2O3:Eu3+ spherical phosphors prepared strongly depend on annealing temperature and dopant concentration. © 2011 Elsevier B.V. Source

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