Sol–gel synthesis and luminescent properties of SiO2/Zn2SiO4 and SiO2/Zn2SiO4:V composite materials

Undoped and vanadium-doped Zn2SiO4 particles embedded in silica host matrix were prepared by a simple solid-phase reaction after the incorporation of ZnO and ZnO:V nanoparticles, respectively, in silica monolith using the sol–gel method with supercritical drying of ethyl alcohol in two steps. After...

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Bibliographic Details
Published in:Journal of luminescence 2012-09, Vol.132 (9), p.2288-2292
Main Authors: El Ghoul, J., Omri, K., El Mir, L., Barthou, C., Alaya, S.
Format: Article
Language:English
Subjects:
Composite materials
Condensed Matter
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Drying
Energy transfer
Exact sciences and technology
Luminescence
Optical materials
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Other solid inorganic materials
Particulate composites
Photoluminescence
Physics
Silicon dioxide
Sol–gel
Temperature
Vanadium
Zinc oxide
Zn2SiO4
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Summary:Undoped and vanadium-doped Zn2SiO4 particles embedded in silica host matrix were prepared by a simple solid-phase reaction after the incorporation of ZnO and ZnO:V nanoparticles, respectively, in silica monolith using the sol–gel method with supercritical drying of ethyl alcohol in two steps. After supercritical drying and annealing in the temperature range between 1423 and 1473K in an air atmosphere, the photoluminescence (PL) measurements show a band centered at about 760nm in the case of non-doped Zn2SiO4 which is attributed to energy transfer from Zn2SiO4 particles to NBOHs interface defects. In the case of vanadium doped Zn2SiO4, the PL reveals a band centered at about 540nm attributed to the vanadium in the interfaces between Zn2SiO4 particles and SiO2 host matrix. Photoluminescence excitation (PLE) measurements show different origins of the emission bands. The PLE band (∼240–350nm) may be understood as an energy transfer process from O2− to V5+ which occurs intrinsically in the vanadyl group. ► Elaboration of vanadium doped Zn2SiO4 nanoparticles. ► Structural and optical characterizations of Zn2SiO4:V nanoparticles. ► The powder shows an average particle size of 25nm. ► A strong luminescence band appears in the visible and infrared range.
ISSN:0022-2313
1872-7883
DOI:10.1016/j.jlumin.2012.03.069