Spectral analysis and structure of Cu²⁺-doped cadmium bismuth borate glasses

Abstract

with excitations wavelength at 330 nm. The FTIR profile revealed that the glass has both BO₃ and BO₄ units. Due to presence New series of cadmium bismuth borate (CBBC) glasses have been developed by varying bismuth content in the chemical compositions of 20CdO^.<i style="">x</i>Bi₂O₃^.(79.5-x)B₂O₃, where <i>x</i> = 15, 20, 25, 30 and 35 mol % Bi₂O₃, containing 0.5 mol% of Cu²⁺ ions. These glasses have been prepared by melt-quench technique (1150°C in air) for verifying there UV filtration performance. From the measurement of UV absorption spectra, both direct and indirect band gaps have been evaluated. Also different physical properties of the prepared glasses have also been studied. The refractive index of prepared glasses has been measured by using Brewster angle method. The amorphous nature of the glasses has been confirmed by X-ray diffraction. The spectroscopic properties of the glasses have been investigated using optical absorption spectra and fluorescence spectra. Optical transmission spectra of Cu²⁺ ions doped CBBC glasses have shown two peaks at 450 nm (²<i style="">B</i>_1g → ²<i style="">E</i>_g) and 645 nm (²<i style="">B</i>_1g → ²<i style="">B</i>_2g). Emission spectra of (0.5 mol %) Cu²⁺: CBBC have revealed two emission transitions at 412 and 523 nm of both Bi₂0₃ and CdO, these glasses are found to be good moisture-resistant optical systems.