Synthesis and characterization of Gd2O3:Eu phosphor nanoparticles by a sol-lyophilization technique |
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Authors: | C Louis Marco A Flores K Lebbou O Tillement C Dujardin |
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Institution: | a Physical Chemistry of Luminescent Materials, Claude Bernard/Lyon University, CNRS UMR 5620, Villeurbanne, Cedex 69622, Franceb UMR 5510 CNRS INSA of Lyon, France |
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Abstract: | The characterization and luminescence properties of nanostructured Gd2O3:Eu3+ phosphors synthesized by a sol-lyophilization process are presented. After preparation of gadolinium-based sols from gadolinium nitrate and ammonium hydroxide, the so-prepared sols were freeze dried at −10°C and calcinated at different temperatures. For temperatures lower than 1300 K, highly crystalline samples with the cubic structure can be obtained without concomitant grain growth of the particles (<50 nm). The luminescence spectra contain all possible transitions of Eu3+ with C2 symmetry and present two major features: an increase of the luminescence efficiencies of the phosphors in comparison with that obtained by solid-state reaction and the presence of an additional peak at about 609 nm at the vicinity of the 5D0→7F0…4 transition. |
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Keywords: | Lyophilization Nanoparticles Crystalline Phosphors Luminescence |
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