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Updated: Jun 9, 2025
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A Technical Guide for Performing Spectroscopic Measurements on Metal-Organic Frameworks
Published on: April 28, 2023
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Spectroscopic Properties of TmF3-Doped CaF2 Crystals
Carla Schornig1, Marius Stef1, Gabriel Buse2
1Crystal Growth Laboratory, Faculty of Physics, West University of Timisoara, 4 Bd. Vasile Parvan, 300223 Timisoara, Romania.
Materials (Basel, Switzerland)
|October 26, 2024
Summary
We grew TmF3-doped CaF2 crystals and analyzed their optical properties. Optimal luminescence for Tm3+ and Tm2+ ions occurred at 0.1 mol% TmF3, with new UV emission reported for Tm2+.
Area of Science:
- Materials Science
- Solid-State Physics
- Spectroscopy
Background:
- Fluoride crystals like CaF2 are promising hosts for rare-earth ions.
- Thulium (Tm) ions, in both trivalent (Tm3+) and divalent (Tm2+) states, exhibit unique optical properties.
- Understanding doping effects is crucial for developing advanced optical materials.
Purpose of the Study:
- To grow TmF3-doped CaF2 crystals using the vertical Bridgman method.
- To conduct a comprehensive spectroscopic analysis of Tm3+ and Tm2+ ions within the CaF2 host.
- To investigate the influence of TmF3 concentration on optical absorption and photoluminescence.
Main Methods:
- Vertical Bridgman crystal growth technique.
- UV-VIS-NIR optical absorption spectroscopy.
- Photoluminescence spectroscopy.
- Judd-Ofelt (JO) formalism for optical parameter calculation.
Main Results:
- Characteristic absorption bands for both Tm3+ and Tm2+ ions were identified.
- Judd-Ofelt intensity parameters (Ω2, Ω4, Ω6) were determined for Tm3+.
- Significant Tm3+ and Tm2+ emissions were observed at 0.1 mol% TmF3 doping.
- A novel UV emission band attributed to Tm2+ was discovered.
- Higher TmF3 concentrations led to luminescence quenching due to non-radiative energy transfer.
Conclusions:
- The study elucidates the optical behavior of Tm-doped CaF2 crystals.
- Optimal TmF3 concentration for luminescence is around 0.1 mol%.
- The findings have implications for laser technologies and radiation dosimetry applications.
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