Synthesis and characterization of Ce doped silica (SiO2) nanoparticles |
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Authors: | LF Koao RI Obed |
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Institution: | a Department of Physics, University of the Free State, P.O. Box 339, Bloemfontein, South Africa b Department of Physics, University of Ibadan, Ibadan, Nigeria |
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Abstract: | A series of silica doped with different mol percentages of Ce3+ concentration was synthesized using a sol-gel method to determine the dependence of photoluminescence wavelengths and intensity on the concentrations of the dopants. Sol-gel glasses are porous networks that have been densified through chemical processing and heat treatment. Rare-earths (REs) are insoluble in silica; due to this insolubility RE ions in silicate glasses enter as network modifiers and compete for non-bridging oxygen in order to complete their coordination. The morphological, structural, thermal and optical properties of the phosphors were characterized by X-ray diffraction, scanning electron microscopy, UV-vis absorption, photoluminescence, thermogravimetric analyses and differential scanning calorimeter. Silica (SiO2) gel containing Ce3+ ions was sputter coated with Au (gold) in order to monitor surface morphology of the samples. The highest emission intensity was found for the sample with a composition of 0.5 mol% Ce3+. Cerium doped silica glasses had broad blue emission corresponding to the 2D3/2-2FJ transition at 448 nm but exhibited apparent concentration quenching above concentrations of 0.5 mol% Ce3+. |
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Keywords: | Synthesis Nanoparticles Ce3+-doped silica Photoluminescence |
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