Preparation and luminescence characterization of Zn(1−x)MoO4: xDy3+ phosphor for white light-emitting diodes

Abstract Different concentrations of Dy 3+ ions activated ZnMoO 4 luminescent phosphors were prepared using the solid-state reaction method by sintering at 900 °C. Phase purity features of the prepared phosphors were characterized by X-ray diffraction (XRD) patterns and the particle size has been found to be about 40 nm. The compositional and structural details were carried out using Fourier transform infrared (FTIR) spectrum. The characteristic emission peaks of Dy 3+ ions were observed due to the 4 F 9/2 → 6 H 15/2 (490 nm) and 4 F 9/2 → 6 H 13/2 (580 nm) transitions. The variation of luminescence intensity with Dy 3+ ions concentrations as well as with different excitation wavelengths has been discussed. The CIE chromaticity color coordinates ( x , y ) were calculated from the luminescent characteristics of ZnMoO 4 : Dy 3+ phosphors, which fall in the white light region of the chromaticity diagram. The lifetime of 4 F 9/2 excited level has been quenched due to the energy transfer among Dy 3+ ions at higher concentrations.