Sol–gel synthesis of red-phosphors [NaxGd1−x/3−zEuz]MoyW1−yO4 powers and luminescence properties

In this work, we report on the sol–gel synthesis of red-phosphors [NaxGd1−x/3−zEuz]MoyW1−yO4 powders doped with several dopants and its luminescence properties at room temperature. X-ray diffraction patters indicated that red-phosphors powders present tetragonal symmetry and cubic structure. The red-phosphors [NaxGd1−x/3−zEuz]MoyW1−yO4 powders doped exhibit characteristic of a ultraviolet visible-light emission diode. The SEM images for [Na0.9Gd0.62Eu0.043+]Mo0.4W0.6O4 phosphor exhibits irregular morphology and cottonlike shape. The size of the particles is estimated to be about 1 μm. Luminescence properties showed that the maximum emission in red region lies in the arrange of 613 nm and 617 nm.

Research highlights
► Cottonlike-shape 1μm particle size and red-emission [Na0.9Gd0.66Eu0.043+] [M0.4W0.6O4] phosphor prepared.
► The maximum emission peaks at 613 nm and 617 nm.
► At least two kinds of luminescent centers in the host.
► One possible emission mechanism mentioned.