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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...
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Article
Open AccessSol–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...
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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...
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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...
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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...
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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...
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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...
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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...
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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 ...
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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–...
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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...
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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...
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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...