Examination of the structural and upconversion phenomenon in ZnWO4: Er3+ phosphors

In the present study, the Er3+ doped ZnWO4 phosphors have been prepared at different concentrations by using the solid state reaction method. The phase and lattice parameters has been investigated using X-ray diffraction analysis. The frequency upconversion (UC) emission spectra of the prepared samples has been observed in the 450 nm to 700 nm wavelength region. We have observed three UC emission bands peaking near ⁓ 524 nm (green), ⁓ 549 nm (green) and ⁓ 656 nm (red) related to the 2H11/2→4I15/2, 4S3/2→4I15/2 and 4F9/2→4I15/2 transitions respectively. The emission spectra of the Er3+ doped phosphor is represented using a energy level diagram. On the basis of UC emission intensity it can be said that the prepared phosphors can be applied in green emitting display devices.