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<p>Co-precipitation route synthesized undoped CeO<sub>2</sub> and Ce<sub>1-x</sub>Dy<sub>x</sub>O<sub>2</sub> (where <i>x</i> = 0.03, 0.06, 0.09 and 0.12) nanoparticles were investigated with X-ray diffraction (XRD), Transmission Electron Microscopy (TEM), UV–Vis Spectroscopy, Raman spectroscopy, Photoluminescence (PL) Spectroscopy, X-ray Photoelectron Spectroscopy (XPS) and&#xa0;SQUID characterization. XRD analysis revealed FCC structure of <i>fm</i>-<i>3m</i> space group with average crystallite sizes of 8–11&#xa0;nm for the nanoparticles. TEM reflected the spherical geometry of particle with sizes of 6–9&#xa0;nm. Raman analysis confirmed red shifting of F<sub>2g</sub> mode due to formation of oxygen vacancies in CeO<sub>2</sub> nano-lattice with Dy doping. The band gap energy values were found to increase with UV–Vis spectra. PL analysis confirmed domestic light application with the white luminescence for undoped CeO<sub>2</sub> and yellow luminescence for Dy-doped CeO<sub>2</sub> with high CRI values. The valence states of Ce ions as 4+ and 3+ , of Dy ions as 3+ was reported with XPS analysis. The conversion of Ce<sup>4+</sup> in Ce<sup>3+</sup> led to the formation of oxygen vacancies and its bonding with Dy ions. The XPS and PL analysis proposed oxygen vacancies at surface of nanoparticles were key components for room temperature ferromagnetic properties for all the doped nanoparticles. The magnetism of Dy-doped CeO<sub>2</sub> were suggested to be influenced by the formation of F-center exchange interaction and Bound Magnetic Polaron. These nanoparticles would be extremely beneficial for the spintronics, optoelectronics and magneto-optic applications.</p>

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Ferromagnetic interactions and luminescence in Dy-doped CeO2 nanoparticles with regard of defects and electronic structure

  • 期刊论文

  • 发表日期：

    2025年3月31日

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  • Mridula Dave,
  • N. S. Leel,
  • M. Kiran,
  • P. A. Alvi,
  • B. Dalela,
  • Shalendra Kumar,
  • S. Dalela

摘要

Co-precipitation route synthesized undoped CeO2 and Ce1-xDyxO2 (where x = 0.03, 0.06, 0.09 and 0.12) nanoparticles were investigated with X-ray diffraction (XRD), Transmission Electron Microscopy (TEM), UV–Vis Spectroscopy, Raman spectroscopy, Photoluminescence (PL) Spectroscopy, X-ray Photoelectron Spectroscopy (XPS) and SQUID characterization. XRD analysis revealed FCC structure of fm-3m space group with average crystallite sizes of 8–11 nm for the nanoparticles. TEM reflected the spherical geometry of particle with sizes of 6–9 nm. Raman analysis confirmed red shifting of F2g mode due to formation of oxygen vacancies in CeO2 nano-lattice with Dy doping. The band gap energy values were found to increase with UV–Vis spectra. PL analysis confirmed domestic light application with the white luminescence for undoped CeO2 and yellow luminescence for Dy-doped CeO2 with high CRI values. The valence states of Ce ions as 4+ and 3+ , of Dy ions as 3+ was reported with XPS analysis. The conversion of Ce4+ in Ce3+ led to the formation of oxygen vacancies and its bonding with Dy ions. The XPS and PL analysis proposed oxygen vacancies at surface of nanoparticles were key components for room temperature ferromagnetic properties for all the doped nanoparticles. The magnetism of Dy-doped CeO2 were suggested to be influenced by the formation of F-center exchange interaction and Bound Magnetic Polaron. These nanoparticles would be extremely beneficial for the spintronics, optoelectronics and magneto-optic applications.