Luminescence investigation of Eu3+ activated double molybdates red phosphors with scheelite structure

A series of Eu3+-doped double molybdates red phosphors, NaLn1−xEux(MoO4)2, AEu(MoO4)2 (Ln = La, Gd and Y, A = Li, Na and K) and A0.5A′0.5Eu(MoO4)2A0.5A′0.5Eu(MoO4)2 (A, A′ = Li, Na and K) were prepared by the conventional solid-state reaction. Their excitation spectra, emission spectra and decay curves were measured at room temperature. The relationship between the structures and the photoluminescent properties of the phosphors was studied. The phosphors show intensely red emission with good color purity. Among these phosphors, LiEu(MoO4)2 exhibits the strongest red emission under 395 nm light excitation and appropriate CIE chromaticity coordinates (0.66, 0.34) close to the NTSC standard values, and therefore may find application on near UV InGaN chip-based white-light-emitting diodes.