Synthesis and enhanced luminescence properties of double perovskite NaLa0.95-xYxEu0.05MgWO6phosphors

Double perovskite Na(La, Y)MgWO6:Eu(3+)phosphors were obtained by the sol-gel method. X-ray diffractometer (XRD) patterns, scanning electron microscopy (SEM) images and photoluminescence properties were carried out to study the effect of polyethylene glycol (PEG). Enhanced optical properties were obtained by adding 3 wt% PEG under the excitation of 395 nm. Y(3+)with smaller radius was selected to substitute La(3+)in this host to decrease the symmetry and further enhance the luminescence properties. With Y(3+)concentration increasing, Na(2)WO(4)and Y(30)W(8)O(69)phases came up. The emission spectra showed different shapes, and the emission intensity was enhanced by doping Y3+. Under the excitation of 395 and 465 nm, the emission intensity reached the maximum. The Commission Internationale de L'Eclairage (CIE) coordinates of the phosphors were on the edge of the CIE diagram, illustrating that this double perovskite phosphor showed good color purity. Above luminescence properties showed that the synthesized phosphors had great potential in solid-state lighting.