Abstract

Single phased dysprosium doped GdSrAl3O7 nanophosphor has been successfully obtained via low temperature solution combustion synthesis (SCS). The crystal structure and particle morphology of the nanophosphor were investigated by the X-ray diffraction (XRD), Fourier transform infra-red spectroscopy (FT-IR), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). All observations indicate that SCS yields pure-phased, well crystallized tetragonal GdSrAl3O7 phosphor with particle dimensions in the nano-regime at low sintering temperature (550oC). The photoluminescent excitation and emission spectra were studied to characterize the optical properties of the GdSrAl3O7: Dy3+ nanophosphor. Several sharp excitation peaks attributed to intra-4f transitions of the Dy3+ ions in the near UV region were observed, as well as characteristic blue and yellow emission ascribed to 4 F9/2 → 6H15/2 and 4 F9/2 → 6H13/2 transitions, respectively. The emission spectral features confirm that dysprosium occupies low symmetry site in GdSrAl3O7 lattice. In addition, the optimum Dy3+ ions concentration and decay curves were also investigated. The optical features suggest that Dy3+ doped GdSrAl3O7 nanophosphor may play a vital role in advanced lighting devices. © 2018 iGlobal Research and Publishing Foundation. All rights reserved.

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