Synthesis and Structural, Optical, Photoluminescence and Electronic Structure Studies of SrAl2O4 Phosphor

Abstract

In this work, pure SrAl2O4 phosphor is synthesized using precipitation method annealed at 1000 ºC and characterized by XRD, FTIR, UV-visible, Raman, SEM, EDX, TEM, SAED and photoluminescence spectroscopy. The XRD pattern reveals the unit cell structure of SrAl2O4 as monoclinic. The SEM and TEM images show a non-uniform shape with agglomeration, and its size varies from 10 to 80 nm. The SAED pattern confirms polycrystalline and single crystal in the different selected area with different magnification. Photoluminescence emission shows a peak at 467 nm (blue) when excited at 272 nm wavelength. The electronic structure calculation with the density functional theory (DFT) shows a band gap of 4.4 eV, which is nearly equal to 4.46 eV obtained from the experiment optical absorption spectrum. The findings would be beneficial for furthermore investigations on doping in the pure SrAl2O4 phosphor to enhance its high luminescent intensity and long-lasting for a future technological purpose.