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Ag-Sensitized NIR-Emitting Yb3+-Doped Glass-Ceramics
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- Enrichi, Francesco (author)
- CNR-ISP Istituto di Scienze Polari, c/o campus scientifico Università Ca’ Foscari Venezia, via Torino 155, 30172 Mestre-Venezia, Italy. Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca’ Foscari Venezia, via Torino 155, 30172 Mestre-Venezia, Italy
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- Cattaruzza, Elti (author)
- Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca’ Foscari Venezia, via Torino 155, 30172 Mestre-Venezia, Italy
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- Finotto, Tiziano (author)
- Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca’ Foscari Venezia, via Torino 155, 30172 Mestre-Venezia, Italy
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- CNR-ISP Istituto di Scienze Polari, c/o campus scientifico Università Ca’ Foscari Venezia, via Torino 155, 30172 Mestre-Venezia, Italy Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca’ Foscari Venezia, via Torino 155, 30172 Mestre-Venezia, Italy Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca’ Foscari Venezia, via Torino 155, 30172 Mestre-Venezia, Italy (creator_code:org_t)
- 2020-03-23
- 2020
- English.
- In: Applied Sciences. - : MDPI. - 2076-3417. ; 10:6
- Journal article (peer-reviewed)
Abstract
Subject headings
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- The optical photoluminescent (PL) emission of Yb3+ ions in the near infrared (NIR) spectral region at about 950–1100 nm has many potential applications, from photovoltaics to lasers and visual devices. However, due to their simple energy-level structure, Yb3+ ions cannot directly absorb UV or visible light, putting serious limits on their use as light emitters. In this paper we describe a broadband and efficient strategy for sensitizing Yb3+ ions by Ag codoping, resulting in a strong 980 nm PL emission under UV and violet-blue light excitation. Yb-doped silica–zirconia–soda glass–ceramic films were synthesized by sol-gel and dip-coating, followed by annealing at 1000 °C. Ag was then introduced by ion-exchange in a molten salt bath for 1 h at 350 °C. Different post-exchange annealing temperatures for 1 h in air at 380 °C and 430 °C were compared to investigate the possibility of migration/aggregation of the metal ions. Studies of composition showed about 1–2 wt% Ag in the exchanged samples, not modified by annealing. Structural analysis reported the stabilization of cubic zirconia by Yb-doping. Optical measurements showed that, in particular for the highest annealing temperature of 430 °C, the potential improvement of the material’s quality, which would increase the PL emission, is less relevant than Ag-aggregation, which decreases the sensitizers number, resulting in a net reduction of the PL intensity. However, all the Ag-exchanged samples showed a broadband Yb3+ sensitization by energy transfer from Ag aggregates, clearly attested by a broad photoluminescence excitation spectra after Ag-exchange, paving the way for applications in various fields, such as solar cells and NIR-emitting devices.
Subject headings
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
Keyword
- sol–gel
- silica–zirconia
- glass–ceramics
- Ag nanoaggregates
- Yb3+ ions
- energy transfer
- downshifting
- photoluminescence
- Experimentell fysik
- Experimental Physics
Publication and Content Type
- ref (subject category)
- art (subject category)
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- Vomiero, Alberto
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- Luleå University of Technology
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