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Upcycling solar glass into Ce-doped oxyfluorides: spectroscopic and crystallization properties

Marcos Paulo Belançon, Rafaela Valcarenghi, Marcelo Sandrini, Brenno Greatti, Robson Ferrari Muniz, Vitor Santaella Zanuto, Sandra Ory, Aurélien Canizares, Maxence Vigier, Emmanuel Veron, Mathieu Allix, Michael Pitcher

Abstract

Oxyfluorides containing up to 80 wt% recycled glass from end-of-life solar panels have been investigated. Reduced processing temperature and high transparency have shown that the material has potential for optical applications. In this work, cerium-doped samples were investigated. Spectroscopic study reveals the presence of Ce$^{3+}$, and luminescence from these ions and oxygen-deficient centers was detected. Raman demonstrated that cerium affects the glass network by promoting polymerization. In turn, thermal analysis indicated some changes in the crystallization events between 500-800 $^o$ C, which were confirmed by in situ X-ray powder diffraction measurements. Crystallization of fluorite, xonotlite, and combeite was confirmed, while other phases give minor contributions to the XRD patterns. Cerium addition reduced the formation of xonotlite, mainly above 700 $^o$ C. The potential applications of the material and the further studies required are discussed.

Upcycling solar glass into Ce-doped oxyfluorides: spectroscopic and crystallization properties

Abstract

Oxyfluorides containing up to 80 wt% recycled glass from end-of-life solar panels have been investigated. Reduced processing temperature and high transparency have shown that the material has potential for optical applications. In this work, cerium-doped samples were investigated. Spectroscopic study reveals the presence of Ce, and luminescence from these ions and oxygen-deficient centers was detected. Raman demonstrated that cerium affects the glass network by promoting polymerization. In turn, thermal analysis indicated some changes in the crystallization events between 500-800 C, which were confirmed by in situ X-ray powder diffraction measurements. Crystallization of fluorite, xonotlite, and combeite was confirmed, while other phases give minor contributions to the XRD patterns. Cerium addition reduced the formation of xonotlite, mainly above 700 C. The potential applications of the material and the further studies required are discussed.

Paper Structure

This paper contains 5 sections, 10 figures, 1 table.

Table of Contents

  1. Introduction
  2. Materials and methods
  3. Results and discussion
  4. Conclusion
  5. Acknowledgement

Figures (10)

  • Figure 1: CgCaF12 samples under natural light (top) and 254 nm ilumination (bottom), from 0 to 1.0 % (left to right) cerium oxide concentration.
  • Figure 2: Absorbance spectra as measured. The inset shows the computed difference between CgCAF12Ce0.10 and CgCAF12 spectra.
  • Figure 3: Emission spectra of matrix and a doped sample, including an asynchronous emission spectrum (smoothed in the red dashed curve) where fast components can not be detected. Intensities were adjusted for better data visualization.
  • Figure 4: ODC (Ce$^{3+}$) emission under 225 (330) nm pumping, and ODC excitation for 510 (440) nm emission. Intensities were adjusted for better data presentation. A representative energy diagram for both species is also shown.
  • Figure 5: Raman spectra under 514 nm wavelength. The gray dotted lines indicate the positions of the main bands, as identified in the figure.
  • ...and 5 more figures