Zn_0.96-xLa_0.04Cu_xO₂ (x = 0, 0.02 & 0.04) nanoparticles have been synthesized by a co-precipitation method. The synthesized nanoparticles have been characterized by powder X-ray diffraction, energy-dispersive X-ray spectra, Scanning electron microscope, UV–Visible spectrophotometer and Fourier transform infrared spectroscopy. The XRD measurements reveal that the prepared samples   were found to be hexagonal wurtzite. The change in lattice parameters was discussed based on the secondary phase formation and presence of Cu²⁺ in LaO and ZnO₂ lattice. The variation in size and shape of the nanoparticles by Cu-doping was discussed using a scanning electron microscope. The chemical stoichiometry of Zn, Cu, La, and O was confirmed by energy-dispersive X-ray spectra. The best optical transparency observed at Zn_0.92La_0.04Cu_0.04O nanoparticles seems to be optimal for industrial applications especially as a transparent electrode.

       Keywords: XRD, Bandgab, absorbence, optical transparency,optical electrode.