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<p>Up-conversion process in co-doped Er<sup>3+</sup>/Yb<sup>3+</sup>: SiO<sub>2</sub>-Y<sub>2</sub>O<sub>3</sub> at different annealing temperatures was analyzed for the first time. SEM micrographs show changes in the morphology due to temperature treatment. XRD analyses agree with the observed morphology and its correlation with the ceramic glassy phase. FTIR spectra of the samples were obtained at room temperature in the range 450–4000&#xa0;cm<sup>−1</sup>. Absorbance spectra show bands modifications depending on dopant concentration and annealing temperature. All samples with temperature treatment show prominent green (510–575&#xa0;nm) emission band, and two more emissions, red (625–690&#xa0;nm), and blue emission bands (475–510&#xa0;nm); this last one intensity depends on temperature and dopant concentration in the samples. Samples without temperature treatment show weak green, red, and blue emissions. The fluorescence red to green intensity ratio confirms the important role of annealing temperature in the material phase, which promotes enhanced Up-conversion emission.</p>

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Structural, morphological and photoluminescent study of SiO2-Y2O3 doped with Er3+ and Yb3+ with enhanced Up-conversion emission

  • 期刊论文

  • 发表日期：

    2025年7月2日

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  • Jorge L. Cervantes,
  • L. A. Diaz-Torres,
  • Janet Elias,
  • M. A. Vallejo

摘要

Up-conversion process in co-doped Er3+/Yb3+: SiO2-Y2O3 at different annealing temperatures was analyzed for the first time. SEM micrographs show changes in the morphology due to temperature treatment. XRD analyses agree with the observed morphology and its correlation with the ceramic glassy phase. FTIR spectra of the samples were obtained at room temperature in the range 450–4000 cm−1. Absorbance spectra show bands modifications depending on dopant concentration and annealing temperature. All samples with temperature treatment show prominent green (510–575 nm) emission band, and two more emissions, red (625–690 nm), and blue emission bands (475–510 nm); this last one intensity depends on temperature and dopant concentration in the samples. Samples without temperature treatment show weak green, red, and blue emissions. The fluorescence red to green intensity ratio confirms the important role of annealing temperature in the material phase, which promotes enhanced Up-conversion emission.