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In this paper ,we report on the fabrication and properties of undoped and 8.4% Er 3+ -doped ZnO nanoparticles synthesized by laser ablation in ethanol at laser fluence values2.92 J/cm 2 . The synthesized nanoparticles are characterized by structural properties using X-ray diffractrometer , scanning electron microscope and the optical properties are carried out through UV–Visible spectrophotometer. The X-ray diffractrometer pattern indicates that these nanoparticle were polycrystalline in nature with a hexagonal (wurtzite) phase. SEM reveals that The synthesized ZnO and Er-ZnO NPs have a spherical shape. Moreover, the optical band gaps calculated through UV spectroscopy are found to be decreased with doping from 3.3 to 3.2 eV.

Structural and Optical Properties of Undoped and Er<sup>3+</sup>-Doped ZnO Nanoparticles Synthesized by Laser Ablation in Ethanol