Physical and optical properties of terbium doped lithium aluminum borate glass

•The terbium doped lithium aluminum borate glasses were successfully prepared by conventional melt – quenching method.•FTIR and Raman studies reveals that the structural changes in the glass matrix by knowing functional groups that exist in the glass matrix and the bonding behavior of the fabricated glass samples.•From UV – visible absorption spectra, the absorption co-efficient has been calculated.•The optical energy band gaps were evaluated using Tauc’s plot and calculated energy band gap.