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

Different concentrations of Dy3+ ions activated ZnMoO4 luminescent phosphors were prepared using the solid-state reaction method by sintering at 900 degrees 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 Dy3+ ions were observed due to the F-4(9/2)-> H-6(15/2) (490 urn) and F-4(9/2)-> H-6(13/2) (580 nm) transitions. The variation of luminescence intensity with Dy3+ ions concentrations as well as with different excitation wavelengths has been discussed. The CIE chromaticity color coordinates (x, y) were calculated horn the luminescent characteristics of ZnMoO4: Dy3+ phosphors, which fall in the white light region of the chromaticity diagram. The lifetime of F-4(9/2) excited level has been quenched due to he energy transfer among Dy3+ ions at higher concentrations. (C) 2013 Elsevier B.V. All rights reserved.