Synthesis and luminescence of SiO2/Zn2SiO4 and SiO2/Zn2SiO4:Mn composite with sol-gel methods - Archive ouverte HAL
Article Dans Une Revue Journal of Luminescence Année : 2013

Synthesis and luminescence of SiO2/Zn2SiO4 and SiO2/Zn2SiO4:Mn composite with sol-gel methods

J. El Ghoul
  • Fonction : Auteur
K. Omri
  • Fonction : Auteur
A. Alyamani
  • Fonction : Auteur
L. El Mir
  • Fonction : Auteur

Résumé

The sol gel method is used for the preparation of undoped and manganese-doped Zn2SiO4 particles embedded in SiO2 host matrix with supercritical drying of ethyl alcohol in two steps. Zn2SiO4 and Zn2SiO4: Mn were prepared by simple solid-phase reaction in a natural atmosphere at 1200 degrees C after the incorporation of the nanoparticles of ZnO and ZnO: Mn, respectively, in the silica monolith. The photoluminescence (PL) measurements show a band centered at about 760 nm in the case of non-doped Zn2SiO4 which is attributed to energy transfer from Zn2SiO4 particles to NBOHs interface defects. In the case of Manganese doped Zn2SiO4, the PL reveals a band centered at about 525 nm attributed to Mn2+ in Zn2SiO4. Photoluminescence excitation (PLE) measurements show different origins of the emission. It was suggested that electronic transition T-4(1)((4)G)->(6)A(1)(S-6) associated with Mn2+ ions in willemite and the presence of Mn2+ in intensive crystal field were responsible for these luminescence band centered at 525 nm. (C) 2013 Elsevier B.V. All rights reserved.
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Dates et versions

hal-01236760 , version 1 (02-12-2015)

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Citer

J. El Ghoul, K. Omri, A. Alyamani, Carlos Barthou, L. El Mir. Synthesis and luminescence of SiO2/Zn2SiO4 and SiO2/Zn2SiO4:Mn composite with sol-gel methods. Journal of Luminescence, 2013, 138, pp.218-222. ⟨10.1016/j.jlumin.2013.02.009⟩. ⟨hal-01236760⟩
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