Synthesis of Sharp Blue Emitting Gd_2O_3:Dy~(3+) Nanophosphor by Co-Precipitation Method

摘要

In this paper, we have reported the synthesizes of dysprosium (Dy~(3+)) doped gadolinium oxide (Gd_2O_3) nanophosphors by the co-precipitation method. The concentration of dysprosium was varied from 1.0 mol% to 2.0 mol%. All the prepared samples were annealed at 1000 °C in the air.The synthesized sample will be characterized by X-ray diffraction (XRD), which revealed the size of Gadolinium oxide nanocrystallites. The crystallite size of Gd_2O_3:Dy~(3+) was found to lie in the range of 30-40 nm. The optical properties of the synthesized samples will be investigated by UV visible spectroscopy and photoluminescence spectroscopy. The band Gap of Gd_2O_3:Dy~(3+)is found to be 5.06 eV. From photo-luminescence studies it was found in the emission spectra of Gd_2O_3: Dy~(3+)has shown a sharp peak at around 485 nm correspond to~4F_(9/2) -~6H_(15/2) transition of the Dy~(3+) ions at an excitation wavelength 220nm. Prepared samples Gd_2O_3:Dy~(3+)nanophosphors can be used as promising blue phosphors in many of the display devices.