Photoluminescence properties of praseodymium doped cerium oxide nanocrystals

Abstract The structure and photoluminescence (PL) properties of CeO 2 nanocrystals synthesized by the microwave-assisted hydrothermal (MAH) method with different praseodymium (Pr 3+ ) ions contents were performed. X-ray diffraction (XRD), transmission electron microscopy (TEM), diffuse reflectance ultraviolet-visible (UV-vis), Fourier transform Raman (FT-Raman) spectroscopies and PL measurements at room temperature were employed. XRD patterns indicated that the nanocrystals are free of secondary phases and crystallize in the cubic structure while FT-Raman revealed a typical scattering mode of fluorite type. The UV-vis spectra suggested the presence of intermediate energy levels in the band gap of these nanocrystals. The most intense PL emission was obtained for CeO 2 nanocrystals doped with 1.6% of Pr 3+ ions and smaller particle size.