Extensive studies of host lattices and activators in lanthanide phosphors based on efficient synthesis

Uniform and dispersive NaLa(MoO 4 ) 2-x (WO 4 ) x (abbreviated as NLMW): Eu 3+ /Tb 3+ (5 mol%) microspheres were successfully synthesized at low temperature (393 K). The incorporation of Bi 3+ or Mn 2+ into CaMoO 4 : Eu 3+ with tetragonal crystalline phase has also been studied. The structure, morphology, and luminescent properties of these powder samples were examined by means of X-ray diffraction (abbreviated as XRD), scanning electron microscopy (abbreviated as SEM), and fluorescent spectrophotometry, respectively. SEM images substantiated that these phosphors have uniform sphere-shaped morphologies. The samples exhibited the characteristic emission of Eu 3+ ( 5 D 0  →  7 F J )/Tb 3+ ( 5 D 4  →  7 F J ) under ultraviolet excitation. Effects of the ratio of MoO 4 /WO 4 on the luminescence behavior were investigated in detail. The MoO 4 /WO 4 ratio was optimized as 1/1. The international commission on illumination (abbreviated CIE for its French name) chromaticity coordinates of NLMW: Eu 3+ and NLMW: Tb 3+ indicate the emissions were located in the red and green region, which will be beneficial for the potential device fabrication . Encapsulation of Bi 3+ and Mn 2+ both can effectively sensitize europium (III) ions, generating stronger red emissions ( 5 D 0  →  7 F J ).