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  1. 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)

  2. 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)

  3. 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)

  4. 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)

  5. 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)

  6. 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)