Synthesis and photoluminescence characterization of Ce3 +  and Dy3 +  activated ALa(WO4)2(A = Na and Li) novel phosphors

In this paper, we report the synthesis of Ce3 +  and Dy3 +  activated alkali lanthanide tungstates, ALa(WO4)2(where A = Na and Li), prepared by solid state reaction method. The prepared phosphors were characterized by X-ray diffraction and photoluminescence techniques. The NaLa(WO4)2:Dy3 +  and LiLa(WO4)2:Dy3 +  phosphors show two emission peaks at around 574 and 486 nm (λexc = 354 nm). NaLa(WO4)2:Ce3 +  and LiLa(WO4)2:Ce3 +  show two emission peaks at around 378 and 425 nm (λexc = 350 nm). Excitation wavelengths of Ce3 +  and Dy3 +  activated alkali lanthanide tungstates are in near UV region i.e. Hg free excitation. These characterizations of phosphors are applicable for solid state lighting. Accordingly, Ce3 +  and Dy3 +  activated NaLa(WO4)2 and LiLa(WO4)2 may be the promising materials for solid state lighting applications.