Abstract
Nano-sized yttria (Y2O3) doped with Eu3+ powders were successfully synthesized by co-precipitation method, where the quenching concentration for photoluminescence study of Eu3+ ions is 12mol% which is much higher than the micro-scaled powders. The effect of changing concentration of co-dopants (Li+, Na+ and K+) along with Eu3+ (12mol%) is studied on optical properties of Y2O3 nanoparticles. The results showed that the incorporation of these metal ions can further improve the luminescence intensity. The highest emission intensity was observed with 6mol% of Li+, 2mol% of Na+, and 1mol% of K+ doping in Y2O3:Eu3+(12mol%) nanoparticles given by the formula (Y0.82mol%Eu0.12mol%Li0.06mol%)2O3, (Y0.86mol%Eu0.12mol%Na0.02mol%)2O3, and (Y0.87mol%Eu0.12mol% K0.01mol%)2O3 respectively. The structural, morphological and optical properties were studied by X-ray diffraction, Rietveld refinement, transmission electron microscopy, Fourier transform infrared spectroscopy, and Photoluminescence spectroscopy. XRD studies followed by Rietveld refinement confirmed the body-centered cubic structure of doped nanophosphors. All the powders were well crystallized and the emission intensity was observed to increase further from quenching concentration of Eu 12mol% with co-doped samples.
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