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Cooperative energy transfer frequency upconversion in Tb3+/Yb3+-codoped oxyfluoride glasses
Li Feng1, Jianhui Zhang, Jing Wang
1State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat-Sen (Zhongshan) University, Guangzhou 510275, PR China.
Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|February 6, 2007
Summary
This study explores upconversion luminescence in terbium (Tb3+) and ytterbium (Yb3+) doped glasses. Researchers found that Tb3+ concentration affects emission bands, with temperature and excitation power influencing luminescence intensity.
Area of Science:
- Materials Science
- Optics and Photonics
- Inorganic Chemistry
Background:
- Upconversion luminescence in rare-earth doped materials is crucial for photonic applications.
- Oxyfluoride glasses offer a promising host matrix due to their unique optical properties.
Purpose of the Study:
- To investigate cooperative energy transfer upconversion in Tb3+/Yb3+-codoped SiO2-Al2O3-Na2O-ZnF2 oxyfluoride glasses.
- To analyze the influence of Tb3+ and Yb3+ concentrations on upconversion emission bands.
- To study the temperature and excitation power dependence of upconversion luminescence.
Main Methods:
- Synthesis of Tb3+/Yb3+-codoped oxyfluoride glasses.
- Characterization using 980 nm diode laser excitation.
- Analysis of upconversion luminescence spectra and intensity variations with temperature (40–450 K) and excitation power.
Main Results:
- Observed emission bands associated with (5)D(3) and (5)D(4) transitions at lower Tb3+ concentrations.
- Suppression of (5)D(3) transitions and dominance of (5)D(4) transitions at higher Tb3+ concentrations.
- Investigated temperature-dependent and excitation power-dependent behaviors of upconversion luminescence intensity.
Conclusions:
- Concentration of Tb3+ plays a critical role in determining the upconversion emission pathways.
- The synthesized oxyfluoride glasses exhibit tunable upconversion luminescence properties.
- Understanding these mechanisms is vital for developing advanced optical materials.
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