Abstract
Eu3+-doped cubic double perovskite Ba3Y2WO9 phosphors have been firstly successfully synthesized by sol–gel method. The prepared samples were characterized by X-ray diffraction (XRD) and field emission-scanning electron microscopy (FE-SEM). The luminescence excitation and emission spectra in the ultraviolet–visible (UV) region were used to investigate the luminescence properties of these phosphors. Then the site-selective excitation and emission spectroscopy along with luminescence decay have been investigated in the 5D0→7F0 region under a pulsed, tunable, narrowband dye laser at room temperature. In our study, the crystallographic occupations of Eu3+ ions were explored based on both spectroscopy and crystal structure of cubic Ba3Y2WO9:Eu3+. The multiple site structure of Eu3+ ions with highly disordered distributions in cubic Ba3Y2WO9 lattices was suggested. The results help us to understand the site assignments of rare earth ions doped in cubic Ba3Y2WO9.
Published Version
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