Effect of Co2+ and Ni2+-doped zinc borate nano crystalline powders by co-precipitation method

• Co2+ and Ni2+ doped Zn3(BO3)2 nano particles prepared using co-precipitation method.
• Photoluminescence spectra exhibited the emission bands in ultraviolet and blue regions.
• From optical absorption spectrum site symmetry of both ions ascribed as octahedral.
• FTIR spectra show the fundamental vibrational bands of host lattice and metal ions.

A simple co-precipitation method has been used for the synthesis of Co2+ and Ni2+-doped zinc borate nanopowders. X-ray diffraction (XRD), Fourier transform infrared (FT-IR), UV/Vis absorption, Scanning electron microscope (SEM) with EDS and photoluminescence (PL) spectroscopies techniques has been employed for their characterization. Powder X-ray diffraction data reveals that the crystal structure belongs to monoclinic for both as-prepared samples. SEM images showed surface morphology of the prepared samples. Optical absorption spectra showed the characteristic bands of doped ions in octahedral site symmetry. From the optical absorption data crystal field and inter-electronic repulsion parameters are evaluated. The FT-IR spectra showed the characteristic vibrational bands related to ZnO, BO3 and BO4 molecules. Photoluminescence spectra exhibited the emission bands in ultraviolet and blue regions.

Synthesis, structural and optical properties of Co2+ and Ni2+ doped Zn3(BO3)2 nano crystalline powders are prepared using co-precipitation method. From the results and discussions, the crystal structure of the prepared samples is identified as monoclinic cell. Optical absorption bands gave the information regarding the site symmetry. For Co2+doped sample, UV emission band observed at 301 nm under the photon excitation of 278 nm. For Ni2+ doped sample, the emission bands were observed at 407, 464, 497 and 599 nm under the photon excitation of 378 nm corresponds to blue, green and orange emission. FT-IR spectra exhibit the fundamental vibrations of host lattice as well as metal ions.Figure optionsDownload as PowerPoint slide