Structure and luminescence properties of La6Ba4(SiO4)6F2:Dy3+ phosphor with apatite structure

In this study, we investigated the structure, luminescence properties and morphology of La6Ba4(SiO4)6F2:Dy3+ in detail using X-ray diffraction (XRD), photoluminescence spectroscopy, scanning electron microscopy (SEM) and decay kinetics measurements. The results indicate that La6Ba4(SiO4)6F2:Dy3+ was well crystallized, and its structure is of apatite-type and belongs to the hexagonal system. The prepared samples exhibit two intense characteristic bands in the blue (484 nm) and yellow (579 nm) spectral ranges corresponding to the Dy3+ transitions 4F9/2 → 6H15/2 and 4F9/2 → 6H13/2, respectively. These dominant photoluminescence bands are accompanied by a weak red band (670 nm) due to the 4F9/2 → 6H11/2 transition. The emission color of La6Ba4(SiO4)6F2:Dy3+ phosphors are found to fall in the white light region. The Dy3+ optimal dopant concentration in the La6Ba4(SiO4)6F2 host was found to be 0.12 (mol). In addition, the phosphors have high thermal stability. Hence, La6Ba4(SiO4)6F2:Dy3+ may have an application in white light-emitting diodes.