Synthesis and optical properties of Mn2+/Mn4+ doped ZnWO4 powders for multi-purpose applications

In the present investigation, pure ZnWO4 and 1mol% Mn-doped ZnWO4 (ZnWO4:Mn2+ and ZnWO4:Mn4+) ceramic powders were synthesized by the conventional solid-state reaction method. The structural and microstructural studies were performed using X-ray diffraction, field emission scanning electron microscopy and Raman spectroscopy. The effect of peak shifts in XRD patterns on the lattice parameters is analysed in the prepared samples. Raman studies confirm the presence of Mn2+ and Mn4+ in the host matrix. The chromaticity parameters of the prepared samples are evaluated using a Commission Internationale de I?Elcairage (CIE) diagram. The study of the downconversion spectra of the prepared samples using an ultra-violet (UV) laser source suggests that transition metal-doped ceramics are a significant class of materials that can produce emissions for cool light-emitting diode applications.