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Enhanced Luminescence and Photocatalytic Activity of the Monovalent Sodium (Na+) Co-Doped MgAl2O4: Eu3+ Nanostructures
In the present work, monovalent sodium (Na+) co-doped MgAl2O4: Eu3+ photocatalyst was prepared bya combustion method followed by annealing at 1000 °. The doping of trivalent Eu3+ ions into a host MgAl2O4 with divalent cations leads to luminescence quenching and hence needs charge compensation to control the quenching, which was systematically studied by powder X-ray diffraction (PXRD), diffuse reflectance spectroscopy (DRS), photoluminescence (PL) and X-ray photoelectron spectroscopy (XPS) etc. The PL spectra of doped and co-doped samples exhibit sharp peaks around 580, 592, 611, 628 and 692 nm associated to the 5D0 → 7 Fj (j = 1–4) transitions of the Eu3+ ions, respectively. The interplay of Na+ and Eu3+ ions in the host MgAl2O4 lattice appears to be an effective charge compensation mechanism that achieve better crystal quality and enhanced red luminescence of such co-doped particles. In addition, we studied the photocatalytic activity of all the prepared photocatalysts. Specifically, Na+ co-doped MgAl2O4: Eu3+ photocatalyst revealed the enhanced photocatalytic activity with photodegradation efficiency 82% under visible light irradiation.
Keywords
Luminescence, Photocatalytic Activity, Diffuse Reflectance Spectroscopy, XPS.
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