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  • 1.
    Enrichi, Francesco
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    Armellini, C.
    CNR-IFN, Istituto di Fotonica e Nanotecnologie, CSMFO Lab. & FBK-CMM.
    Battaglin, G.
    Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca’ Foscari Venezia.
    Belluomo, F.
    Meridionale Impianti SpA.
    Belmokhtar, S.
    Laboratoire des Technologies Innovantes, LTI, Département de Génie industriel ENSA – Tanger.
    Bouajaj, A.
    Laboratoire des Technologies Innovantes, LTI, Département de Génie industriel ENSA – Tanger.
    Cattaruzza, E.
    Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca’ Foscari Venezia.
    Ferrari, M.
    M. Ferrari . Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi, Piazza del Viminale .
    Gonella, F.
    Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca’ Foscari Venezia.
    Lukowiak, A.
    Institute of Low Temperature and Structure Research, PAS.
    Silver doping of silica-hafnia waveguides containing Tb3+/Yb3+ rare earths for downconversion in PV solar cells2016Ingår i: Optical materials (Amsterdam), ISSN 0925-3467, E-ISSN 1873-1252, Vol. 60, s. 264-269Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The aim of this paper is to study the possibility to obtain an efficient downconverting waveguide which combines the quantum cutting properties of Tb3+/Yb3+ codoped materials with the optical sensitizing effects provided by silver doping. The preparation of 70SiO(2)-30HfO(2) glass and glass-ceramic waveguides by sol-gel route, followed by Ag doping by immersion in molten salt bath is reported. The films were subsequently annealed in air to induce the migration and/or aggregation of the metal ions. Results of compositional and optical characterization are given, providing evidence for the successful introduction of Ag in the films, while the photoluminescence emission is strongly dependent on the annealing conditions. These films could find potential applications as downshifting layers to increase the efficiency of PV solar cells

  • 2.
    Enrichi, Francesco
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap. Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi, Roma.
    Belmokhtar, Saloua
    Laboratoire des Technologies Innovantes, LTI, Université Abdelmalek Essâadi, Tanger.
    Benedetti, Alvise
    Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca’ Foscari Venezia, Mestre, Venezia.
    Bouajaj, Adel
    Laboratoire des Technologies Innovantes, LTI, Université Abdelmalek Essâadi, Tanger.
    Cattaruzza, E.
    Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca’ Foscari Venezia.
    Coccetti, F.
    Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi, Roma.
    Colusso, Elena
    Dipartimento di Ingegneria Industriale (DII), Università degli Studi di Padova.
    Ferrari, M.
    Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi, Roma.
    Ghamgosar, Pedram
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    Gonella, Francesco
    Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi, Roma.
    Karlsson, Maths
    Department of Chemistry and Chemical Engineering, Chalmers University of Technology.
    Martucci, Alessandro
    Dipartimento di Ingegneria Industriale (DII), Università degli Studi di Padova.
    Ottini, Riccardo
    Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca’ Foscari Venezia, Mestre, Venezia.
    Riello, Pietro
    Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca’ Foscari Venezia, Mestre, Venezia.
    Righini, Giancarlo C.
    Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi, Roma.
    Trave, Enrico
    Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca’ Foscari Venezia, Mestre, Venezia.
    Vomiero, Alberto
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    You, Shujie
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    Zur, Lidia Z.
    Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi, Roma.
    Ag nanoaggregates as efficient broadband sensitizers for Tb3+ ions in silica-zirconia ion-exchanged sol-gel glasses and glass-ceramics2018Ingår i: Optical materials (Amsterdam), ISSN 0925-3467, E-ISSN 1873-1252, Vol. 84, s. 668-674Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this paper we report the study of down-shifting silica-zirconia glass and glass-ceramic films doped by Tb3+ ions and Ag nanoaggregates, which combine the typical spectral properties of the rare-earth-ions with the broadband sensitizing effect of the metal nanostructures. Na-Tb co-doped silica-zirconia samples were obtained by a modified sol-gel route. Dip-coating deposition followed by annealing for solvent evaporation and matrix densification were repeated several times, obtaining a homogeneous crack-free film. A final treatment at 700 °C or 1000 °C was performed to control the nanoscale structural properties of the samples, resulting respectively in a glass (G) or a glass-ceramic (GC), where tetragonal zirconia nanocrystals are surrounded by an amorphous silica matrix. Ag introduction was then achieved by ion-exchange in a molten salt bath, followed by annealing in air to control the migration and aggregation of the metal ions. The comparison of the structural, compositional and optical properties are presented for G and GC samples, providing evidence of highly efficient photoluminescence enhancement in both systems, slightly better in G than in GC samples, with a remarkable increase of the green Tb3+ PL emission at 330 nm excitation: 12 times for G and 8 times for GC samples. Furthermore, after Ag-exchange, the shape of Tb3+ excitation resembles the one of Ag ions/nanoaggregates, with a broad significant absorption in the whole UV-blue spectral region. This broadband enhanced downshifting could find potential applications in lighting devices and in PV solar cells.

  • 3.
    Zur, Lidia Z.
    et al.
    Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi; CNR-IFN, Istituto di Fotonica e Nanotecnologie, CSMFO Lab. & FBK-CMM.
    Armellini, Cristina
    CNR-IFN, Istituto di Fotonica e Nanotecnologie, CSMFO Lab. & FBK-CMM.
    Belmokhtar, Saloua
    Laboratoire des Technologies Innovantes, LTI, Université Abdelmalek Essâadi, Tanger.
    Bouajaj, Adel
    Laboratoire des Technologies Innovantes, LTI, Université Abdelmalek Essâadi, Tanger.
    Cattaruzza, E.
    Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca’ Foscari Venezia.
    Chiappini, A.
    CNR-IFN, Istituto di Fotonica e Nanotecnologie, CSMFO Lab. & FBK-CMM.
    Coccetti, F.
    Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi”.
    Ferrari, M.
    CNR-IFN, Istituto di Fotonica e Nanotecnologie, CSMFO Lab. & FBK-CMM; Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi” .
    Gonella, Francesco
    Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi”; Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca’ Foscari Venezia.
    Righini, Giancarlo C.
    Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi”; CNR-IFAC, Istituto di Fisica Applicata Nello Carrara .
    Trave, Enrico
    Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca’ Foscari Venezia.
    Vomiero, Alberto
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    Enrichi, Francesco
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap. Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi”.
    Comparison between glass and glass-ceramic silica-hafnia matrices on the down-conversion efficiency of Tb3+/Yb3+ rare earth ions2019Ingår i: Optical materials (Amsterdam), ISSN 0925-3467, E-ISSN 1873-1252, Vol. 87, s. 102-106Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this paper, the investigation of energy transfer efficiency in Tb3+-Yb3+ co-doped SiO2-HfO2 glass and glass-ceramic waveguides is presented. Cooperative energy transfer between these two ions allows to cut one UV or 488 nm photon in two 980 nm photons and could have important applications in improving the performance of photovoltaic solar cells. Thin films with different molar concentrations of rare earths, up to a total concentration of 21%, were prepared by a sol-gel route, using dip-coating deposition technique on SiO2 substrates. The ratio between Yb3+ and Tb3+ ions in all the prepared thin films is constant and equal to 4. The energy transfer between Tb3+ and Yb3+ ions in glass and glass-ceramic waveguides shows the higher efficiency for glass-ceramic with a maximum quantum transfer efficiency of about 190% for the sample containing 19% of rare earths.

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