Spectroscopic properties of copper ions in Na₂O-B₂O₃ glasses

The physical properties of the glasses are having influence not only in the fundamental process but also in its application. In our study, we have studied the physical properties of three different compositions of CuO doped Na₂O-B₂O₃ glasses such as C₀: 40.0 Na₂O-60.0 B₂O₃ (Pure), C₁: 39.9 Na₂O-60.0 B₂O₃-0.1 CuO and C₂: 39.8 Na₂O-60.0 B₂O₃-0.2 CuO (all in mol %) using optical absorption in the region 300 to 1600 nm and infrared spectra in the region 400 to 2000 cm-1. We observed that in the Optical absorption spectra of CuO doped Na₂O-B₂O₃ glasses exhibited a broad absorption band peak position at 800 nm; this band is assigned to the ²B_1g→²B_2g transition. An increase in the intensity of this band is observed with increase in the concentration of CuO in the glass matrix. In the infrared spectrum of pure Na₂O-B₂O₃ glasses has exhibited conventional vibrational bands due to BO3 and BO4 units in the regions 1200‒1600 cm⁻¹ and 900‒1050 cm⁻¹, respectively. With the introduction of CuO from 0.1 to 0.2 mol% the intensity of the band due to BO3 structural units is observed to increase at the expense of band due to of BO4 units.