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  1. No Access

    Chapter and Conference Paper

    Tb3+/Yb3+ Activated Silica-Hafnia Glass and Glass Ceramics to Improve the Efficiency of Photovoltaic Solar Cells

    A down-conversion layer placed on the front side of silicon solar cells waveguides has the potential to cute one high-energy photon into two low energy photons. This paper examines the Tb3+/Yb3+ energy transfer e...

    S. Belmokhtar, A. Bouajaj, M. Britel… in Proceedings of the Mediterranean Conferenc… (2016)

  2. Article

    Open Access

    Sol–gel-derived photonic structures handling erbium ions luminescence

    The sol–gel technique is a very flexible, relatively simple, and low-cost method to fabricate many different innovative photonic structures characterized by specific functionalities. During synthesis, starting...

    A. Lukowiak, A. Chiappini, A. Chiasera, D. Ristic… in Optical and Quantum Electronics (2015)

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  3. No Access

    Article

    Synthesis and characterization of PMMA-based superhydrophobic surfaces

    Recently, superhydrophobic surfaces are gaining much interest because they may be employed in a series of applications, spanning from the realization of self-cleaning surfaces to microfluidics to special water...

    I. Bernagozzi, S. Torrengo, L. Minati, M. Ferrari… in Colloid and Polymer Science (2012)

  4. No Access

    Article

    Er3+-activated silica inverse opals synthesized by the solgel method

    We present the details of the sol-gel processing used to realize inverse silica opal, where the silica was activated with 0.3 mol% of Er3+ ions. The template (direct opal) was obtained assembling polystyrene sphe...

    A. Chiappini, C. Armellini, A. Chiasera, Y. Jestin, M. Ferrari… in Optoelectronics Letters (2007)

  5. No Access

    Article

    Diagnostic techniques for photonic materials based on Raman and Brillouin spectroscopies

    The elastic and vibrational properties of a material, bulk or planar waveguide, are studied by Brillouin and Raman spectroscopy to follow the process of nanocrystals growth in glass-ceramics. The nanoparticles...

    M. Mattarelli, S. Caponi, A. Chiappini, M. Montagna, E. Moser… in Optoelectronics Letters (2007)

  6. No Access

    Article

    Effect of Yb3+ concentration on Er3+ luminescence properties of sol-gelderived silica-alumina xerogels

    Er3+ / Yb3+ co-doped silica-alumina monolithic xerogels were prepared with the same concentration on 2 000 Er/Si ppm and 6 000 Al/Si ppm. The Yb/Si content was varied from 0 to 4 000 ppm Densification of the samp...

    K. Tran Ngoc, H. Pham Thanh, C. Nguyen Duc, C. Armellini… in Optoelectronics Letters (2006)

  7. No Access

    Article

    Photoluminescence Spectroscopy of Er3+/Yb3+ Co-Activated Silica-Alumina Monolithic Xerogels

    Two Er3+/Yb3+ monolithic silica-alumina xerogels doped with different Yb3+ concentrations were prepared by sol–gel route. The samples were thermally treated in air at 950°C for 120 h, and Raman and UV-visible-NIR...

    C. Armellini, A. Chiasera, S. Dirè, M. Ferrari… in Journal of Sol-Gel Science and Technology (2004)

  8. No Access

    Article

    Erbium-Activated Silica-Titania Planar Waveguides

    (100 − x)SiO2-(x)TiO2-ErO3/2 planar waveguides, with 7 ≤ x ≤ 20 have been prepared by sol-gel route using the dip-coating technique. The thickness of the films was optimized to support a single propagating mode a...

    L. Zampedri, M. Ferrari, C. Armellini… in Journal of Sol-Gel Science and Technology (2003)

  9. No Access

    Article

    Er3+/Yb3+ Co-Activated Silica-Alumina Monolithic Xerogels

    Monolithic silica xerogels doped with different concentrations of Er3+, Yb3+ and Al3+ were prepared by sol-gel route. Densification was achieved by thermal treatment in air at 950°C for 120 h with a heating rate ...

    A. Chiasera, M. Montagna, R. Rolli, S. Ronchin… in Journal of Sol-Gel Science and Technology (2003)

  10. No Access

    Article

    X-Ray Absorption and Diffraction Studies of Pr3+, Tb3+ and Er3+-Activated Silica Gels

    Rare-earth (Pr3+, Tb3+, Er3+) doped silica xerogels were studied by x-ray absorption spectroscopy and x-ray diffraction. A change of the local environment around rare-earth ions upon xerogel densification at 900–...

    F. Rocca, C. Armellini, M. Ferrari, G. Dalba… in Journal of Sol-Gel Science and Technology (2003)

  11. No Access

    Article

    Er-doped silica-based waveguides prepared by different techniques: RF-sputtering, sol-gel and ion-exchange

    Erbium-activated silica-based planar waveguides were prepared by three different technological routes: RF-sputtering, sol–gel and ion exchange. Various parameters of preparation were varied in order to optimiz...

    G.C. Righini, S. Pelli, M. Ferrari, C. Armellini… in Optical and Quantum Electronics (2002)

  12. No Access

    Article

    Influence of the Er3+ Content on the Luminescence Properties and on the Structure of Er2O3-SiO2 Xerogels

    Er2O3-SiO2 xerogels doped with different Er/Si concentrations were annealed at 950°C for 120 h. The Er3+ do** level varied from 0 to 40000 Er/Si ppm. The effect of Er2O3 content on the sintering behavior of sil...

    M. Ferrari, C. Armellini, S. Ronchin, R. Rolli… in Journal of Sol-Gel Science and Technology (2000)

  13. No Access

    Article

    Effect of Pr3+ Do** on the OH Content of Silica Xerogels

    Pr2O3-SiO2 xerogels doped with different Pr/Si concentrations were annealed at 900°C for 120 h and then investigated by FTIR, NIR absorption, Raman and luminescence spectroscopies. It is observed that the cont...

    C. Armellini, L. Del Longo, M. Ferrari… in Journal of Sol-Gel Science and Technology (1998)