Photoluminescent properties of white-light-emitting Li6Y(BO3)3: Dy3+ phosphor

In this study, lithiumyttrium borate (LYBO) phosphor was doped with various concentrations of trivalent dysprosium ions. To produce these phosphors, the raw materials were sintered. The phase conformation, crystallinity, grain size, and overall morphology of the synthesized phosphors were studied with X-ray diffraction and scanning electron microscopy. The optimized LYBO phosphor, i. e., the LYBO phosphor that exhibited the highest X-ray-and ultraviolet (UV)-induced photoluminescent intensities, had a Dy3+ concentration of 4 mol%. Photoluminescence analysis showed that this phosphor could be easily excited with near-UV light (300-400 nm). The dominant photoluminescence bands were found in the blue (480 nm) and yellow (577 nm) regions of the visible spectrum. The light yield of the X-ray-induced luminescence of the optimized Li6Y(BO3)(3): Dy(3+)was found to be 66% of that of the commercially available X-ray imaging material, Gd2O2S: Tb3+ (GOS). The chromaticity coordinates of the Li6Y(BO3)(3): Dy3+ phosphor were x = 0.34 and y = 0.32, which agree well with achromatic white (x = 0.33, y = 0.33). The results of this study show that the synthesized Li6Y(BO3)(3): Dy(3+)phosphor could be used as X-ray imaging material. (C) 2016 Elsevier Masson SAS. All rights reserved.