Microwave-assisted synthesis and luminescence properties of Cd(1-x)Eu(x)MoO4 red phosphor.

Cd(1-x)Eu(x)MoO4 nanoparticles were prepared by a microwave-assisted method. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and photoluminescence (PL) spectra were used to characterize the structures, morphologies and the luminescent properties of as-prepared products. Emission and excitation spectra showed that the phosphor exhibits a dominant red emission at 612 nm with excitation wavelength of 330 nm at room temperature. The optimized concentration of Eu3+ is 5 mol.% for the highest emission intensity at 612 nm. The concentration quenching mechanism can be interpreted by the nearest-neighbor ions interaction of Eu3+ ions. It is found that Eu3+ concentration has great impact on the luminescent intensity which is attributed to the variation of the local symmetry. The red emission is visible to naked eyes, indicating that CdMoO4 may act as a promising host material for Eu3+ doped red phosphors.