Ag-Sensitized Yb³⁺ Emission in Glass-Ceramics

Area of Science:

• Materials Science
• Photonics
• Nanotechnology

Background:

• Rare earth doped materials are crucial for photonic devices, with Ytterbium (Yb³⁺) ions widely used for their 980 nm emission.
• Yb³⁺ ions have limited absorption in UV-visible light and often require co-doping, which can result in narrow absorption bandwidths and small cross-sections.
• Efficient energy transfer mechanisms are needed to overcome Yb³⁺'s absorption limitations.

Purpose of the Study:

• To investigate a broadband and efficient energy transfer process between silver (Ag) dimers/multimers and Yb³⁺ ions.
• To achieve strong photoluminescence (PL) emission around 980 nm under UV light excitation.
• To explore potential applications in photovoltaic (PV) solar cells and near-infrared (NIR) light-emitting devices.

Main Methods:

• Preparation of silica-zirconia (70% SiO₂-30% ZrO₂) glass-ceramic films doped with 4 mol.% Yb³⁺ and 5 mol.% Na₂O via sol-gel synthesis.
• Thermal annealing at 1000 °C to form the glass-ceramic structure.
• Introduction of Ag by ion-exchange in molten salt, followed by annealing at 430 °C to induce Ag aggregation and sensitization.

Main Results:

• Successful synthesis of Yb³⁺-doped silica-zirconia glass-ceramic films.
• Evidence of efficient broadband sensitization of Yb³⁺ ions by energy transfer from Ag dimers/multimers under UV excitation.
• Strong photoluminescence emission around 980 nm was observed.

Conclusions:

• Ag dimers/multimers act as efficient broadband sensitizers for Yb³⁺ ions in silica-zirconia glass-ceramics.
• The developed material exhibits strong NIR emission under UV excitation, overcoming the inherent absorption limitations of Yb³⁺.
• This approach holds promise for applications in PV solar cells and NIR light-emitting devices.