Synthesis and photoluminescence study of Ce 3+ /Dy 3+ -activated KLa(WO 4 ) 2 phosphors

Abstract

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.