The present paper reports the Photoluminescence (PL) curves of Erbium doped Gd2O3 phosphors. Gd2O3:Er 3+ Phosphor was synthesized by combustion synthesis method. The phosphor were characterized by using X-ray diffractometer (XRD), Scanning Electron Microscope (SEM), Transmission Electron Microscopy (TEM) and photoluminescence emission spectra. The particle size was calculated by Debye-Scherer's formula. The XRD patterns reveal that these phosphors have monoclinic crystal structure and particle size is 26 nm for urea and 14 nm for glucose. The optical property was characterized by photoluminescence study. The emission spectra consists peak in the range 450-750nm at 960 nm excitation. The emission spectra have intense green emission at 545 nm for both samples.
An Er(3+) -doped phosphor of Gd2O3(Gd2O3:Er(3+)) was prepared using a conventional solid-state reaction method. The structure and particle size were determined from X-ray powder diffraction measurements. The average particle size of the phosphor was in between 20 and 50 nm. The particle size and structure of the phosphor were further confirmed by transmission electron microscopy (TEM) analysis. Luminescence spectra were recorded under excitation wavelengths of 275, 380, 515 and 980 nm. The visible upconversion and downconversion luminescence spectra of the Gd2O3:Er(3+) phosphor were investigated as a function of Er(3+) ion concentration. The upconverted emission at 980 nm excitation shows enhanced red emission with respect to green emission as the dopant concentration increased. Similar results were observed for downconversion emission under 275 and 380 nm excitation wavelengths. The mechanisms responsible for populating the (4)S3/2 and (4)F9/2 levels, for green and red emissions, respectively, are different for different excitations and for different concentrations of Er(3+).
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