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Bismuth borate glasses doped with La³⁺ and Eu³⁺ rare-earth ions with chemical compositions 65B₂O₃ − 15CaO − 15Li₂O − 5Bi₂O₃ − xLa₂O₃ − yEu₂O₃: (x,y) = (0.0, 0.0), (0.5,0.0), (0.5,0.3), and (0.5,0.7) mol% were synthesized using traditional melt quenching process. The obtained glasses were labeled as: La0.0Eu0.0, La0.5Eu0.0, La0.5Eu0.3, and La0.5Eu0.7, respectively. The amorphous nature of the synthesized glasses was confirmed via XRD measurements. Density and molar volume of the glasses were gradually improved from 3.048 g/cm³ and 26.727 cm³/mol for La0.0Eu0.0 sample to 3.430 g/cm³ and 29.257 cm³/mol for La0.5Eu0.7 sample. The indirect and direct optical bandgap of the proposed glasses were reduced with increased La³⁺ and Eu³⁺ ions in the glass matrix. The values of the were 3.30, 3.15, 3.10, and 2.70 eV, while for were 3.88, 3.80 …