Synthesis and spectroscopic characterizations of copper ions doped zinc borate nanoparticles

Spectral investigations of Cu2+-doped zinc borate nanoparticles have been reported in this paper. The as-prepared nanoparticles are characterized using powder XRD, SEM with EDS, HRTEM, optical absorption, electron paramagnetic resonance (EPR), photoluminescence (PL) and FT-IR measurements. The powder XRD patterns confirm the monoclinic crystal structure of the prepared nanoparticles. From the optical absorption spectrum, it is observed that a single broad absorption band is observed. The EPR result confirms that the Cu2+ ions enter distorted octahedral site symmetry at room temperature. The bonding between the metal ion and ligands is partially covalent nature. The PL spectrum exhibits emission bands in the ultraviolet and visible regions at room temperature. The CIE chromaticity coordinates indicate the prepared material shows the light in visible region. The bands observed at 475 and 549 cm−1 are attributed to metal ions-oxygen and BO4 tetrahedron in the molecular structure.