Mg doped ZnO nanoparticles were prepared by chemical synthesis associated with microwave irradiation method. The prepared samples were characterised by XRD, FT-IR, SEM, EDAX, UV and PL methods. The X-ray diffraction pattern revealed the prepared sample was crystalline in nature. FT-IR results help to identify the presence of functional groups in the prepared samples. The morphology and purity of samples were analysed by Scanning Electron Microscopy (SEM) and Energy dispersion X-ray Diffraction (EDAX) analysis. The optical properties were studied using ultra-violet spectroscopy (UV) and Photo Luminance spectroscopy (PL). The synthesized materials will be used as catalysis for the degradation of various pollutants, gas sensors, solar cells and LED devices.