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.
Downshifting
Sol-gel
Rare earths
Broadband sensitizers
Ag nanoaggregates
Författare
F. Enrichi
Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi
Luleå tekniska universitet
Universita Ca' Foscari Venezia
S. Belmokhtar
Abdelmalek Essaâdi University
A. Benedetti
Universita Ca' Foscari Venezia
A. Bouajaj
Abdelmalek Essaâdi University
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
Consiglio Nazionale delle Ricerche (CNR)
P. Ghamgosar
Luleå tekniska universitet
F. Gonella
Universita Ca' Foscari Venezia
Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi
Maths Karlsson
Chalmers, Kemi och kemiteknik, Energi och material
A. Martucci
Università di Padova
R. Ottini
Universita Ca' Foscari Venezia
P. Riello
Universita Ca' Foscari Venezia
G. C. Righini
Consiglio Nazionale delle Ricerche (CNR)
Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi
E. Trave
Universita Ca' Foscari Venezia
A. Vomiero
Luleå tekniska universitet
S. You
Luleå tekniska universitet
L. Zur
Consiglio Nazionale delle Ricerche (CNR)
Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi
Optical Materials
0925-3467 (ISSN)
Vol. 84 668-674Ämneskategorier (SSIF 2011)
Atom- och molekylfysik och optik
Materialkemi
Annan materialteknik
DOI
10.1016/j.optmat.2018.07.074