研究目的
To investigate the quantum cutting properties of Tb3+/Yb3+ co-doped ZrO2-SiO2 nano-crystallized glasses synthesized via a sol-gel route and their potential application in improving the conversion efficiency of solar cells.
研究成果
The study successfully prepared Tb3+/Yb3+ co-doped ZrO2-SiO2 nano-crystallized glasses with a sol-gel method, demonstrating increased energy transfer efficiency with heat-treatment temperature. A post-treatment reduction process improved the down-conversion luminescence intensities and transparency, achieving a high quantum cutting efficiency of 183%. This validates the potential of these materials for wavelength converters in solar cells.
研究不足
The study notes the generation of Tb4+ ions at high temperatures, which can diminish the energy conversion efficiency. The transparency of glasses decreased with increasing heat-treatment temperature, indicating partial oxidation of Tb3+ to Tb4+.
1：Experimental Design and Method Selection:
The study employed a sol-gel process to prepare Tb3+/Yb3+ co-doped ZrO2-SiO2 nano-crystallized glasses. The optical properties and crystal structure were analyzed using XRD, Raman spectroscopy, PL, and PL decay curves analysis.
2：Sample Selection and Data Sources:
Samples were prepared with 1 mol% Tb2O3 and 10 mol% Yb2O3 doped into 30ZrO2-70SiO2 glasses. The samples were heat-treated at different temperatures (900, 1000, 1100 oC) under ambient atmosphere.
3：List of Experimental Equipment and Materials:
Equipment included XRD, Raman spectroscopy (JASCO NRS-2000), PL spectra (Hitachi 7000 with a Xe light source), and absorption spectra (JASCO V-670). Materials included tetraethylorthosilicate (TEOS), zirconium propoxide (Zr(OPr)4), TbCl3·6H2O, and YbCl3·6H2O.
4：0). Materials included tetraethylorthosilicate (TEOS), zirconium propoxide (Zr(OPr)4), TbCl3·6H2O, and YbCl3·6H2O.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The sol-gel process involved hydrolysis of TEOS, mixing with zirconium propoxide solution doped with rare earth ions, drying, water-vapor treatment, and baking at specified temperatures. A post-treatment reduction was also performed.
5：Data Analysis Methods:
The energy transfer efficiency from Tb3+ to Yb3+ ions was calculated using PL decay curves analysis.
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