Citrate-based sol-gel synthesis and luminescent properties of Y6WO12:Eu3+, Dy3+ phosphors for solid-state lighting applications

The rare-earth ions (Eu3+, Dy3+) doped Y6WO12 phosphors were prepared by a citrate-based sol-gel method. The morphologies and structural properties of the as-prepared and doped samples were analyzed by scanning electron microscope images and X-ray diffraction patterns. The luminescent properties were studied by examining the excitation and emission spectra of the samples. The Eu3+ and Dy3+ ions doped samples exhibited their characteristic emission bands in the visible region under ultraviolet light excitation. The temperature-dependent photoluminescence (PL) properties of the samples were also investigated. The PL spectra of the synthesized samples by the sol-gel method were compared with those of the bulk sample prepared by a solid-state reaction. Similarly, the Commission International de I'Eclairage chromaticity coordinates and the decay times of Y6WO12:Eu3+ (3 mol%) and Y6WO12:Dy3+ (2 mol%) phosphors were studied.