Synthesis and photoluminescence study of Ce3+/Dy3+-activated KLa(WO4)2 phosphors

In this study, the authors report the synthesis of Ce³⁺- and Dy³⁺-activated double potassium lanthanum tungstates [KLa(WO₄)₂], prepared by solid-state diffusion method. The prepared phosphors were characterised by X-ray diffraction, scanning electron microscopy and photoluminescence (PL) techniques. The PL spectra of KLa(WO₄)₂:Dy³⁺ shows the emission peaks at 569 and 476 nm. KLa(WO₄)₂:Ce³⁺ showed the emission peaks at 388 nm. Excitation wavelengths of these Ce³⁺- and Dy³⁺-activated tungstates are in near-UV region, that is, Hg-free excitation. Accordingly, Ce³⁺- and Dy³⁺-activated KLa(WO₄)₂ may be the promising materials for solid-state lighting applications.