Synthesis and Luminescent Properties of Eu3+ Activated SrWO4 Nanocrystalline Microspheres

We synthesized the Eu3+ activated SrWO4 nanocrystalline microspheres by a simple and facile synthesis route. X-ray diffraction patterns exhibited a unique phase of SrWO4:Eu3+ scheelite structure with an average crystallite size of 58.9 nm. Fourier transform infrared spectra revealed the presence of absorption bands of WO42 and polyethylene glycol. The optical properties were investigated by varying the Eu3+ ion concentration. Photoluminescence (PL) excitation spectra confirmed that these phosphors are able to be excited by UV, near UV, and visible wavelengths. PL emission spectra showed the bright-red emission due to the D-5(0) -> F-7(2) electric dipole transition from the sites of non-inversion symmetry. The optimal doping concentration of Eu3+ ions was found to be 7 mol%. Blending this phosphor with YAG:Ce3+ phosphors may compensate their lack of a red spectral component, which leads to a good natural white light for indoor illumination.