Ag nanoaggregates as efficient broadband sensitizers for Tb3+ ions in silica-zirconia ion-exchanged sol-gel glasses and glass-ceramics
Artikel i vetenskaplig tidskrift, 2018

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.

Sol-gel

Broadband sensitizers

Downshifting

Rare earths

Ag nanoaggregates

Författare

F. Enrichi

Luleå tekniska universitet

Universita Ca' Foscari Venezia

Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi

S. Belmokhtar

Université Abdelmalek Essaâdi

A. Benedetti

Universita Ca' Foscari Venezia

A. Bouajaj

Université Abdelmalek Essaâdi

E. Cattaruzza

Universita Ca' Foscari Venezia

F. Coccetti

Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi

E. Colusso

Università di Padova

M. Ferrari

Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi

Istituto di Fotonica e Nanotecnologie (CNR-IFN)

P. Ghamgosar

Luleå tekniska universitet

F. Gonella

Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi

Universita Ca' Foscari Venezia

Maths Karlsson

Oorganisk miljökemi 2

A. Martucci

Università di Padova

R. Ottini

Universita Ca' Foscari Venezia

P. Riello

Universita Ca' Foscari Venezia

G. C. Righini

Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi

Istituto Di Fisica Applicata Nello Carrara

E. Trave

Universita Ca' Foscari Venezia

A. Vomiero

Luleå tekniska universitet

S. You

Luleå tekniska universitet

L. Zur

Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi

Istituto di Fotonica e Nanotecnologie (CNR-IFN)

Optical Materials

0925-3467 (ISSN)

Vol. 84 668-674

Ämneskategorier

Atom- och molekylfysik och optik

Materialkemi

Annan materialteknik

DOI

10.1016/j.optmat.2018.07.074

Mer information

Senast uppdaterat

2018-10-18