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Dy₂O₃ doped calcium boroaluminate (CaBAl) glasses (50) B₂O₃-(25-x) CaO-(15) Al₂O₃-(10) CaF₂-(xDy₂O₃) (x = 0.0, 0.5, 1, 2, 3, and 5 wt%) were prepared by using the conventional melt-quenching technique and characterized through XRD, FTIR, refractive index, volumetric density, absorption, excitation, photoluminescence and lifetime measurements. The amorphous nature of the CaBAl glasses was confirmed through XRD measurements. FTIR analysis allowed identifying stretching and bending vibrations of different borate groups. Absorption spectra presented characteristic peaks of Dy³⁺, corresponding to transitions from the ⁶H_15/2 ground state to the excited energy levels. Oscillator strengths and Judd–Ofelt intensity parameters (Ω_t = 2, 4 and 6) were calculated from the absorption spectra. The photoluminescence spectra of the Dy³⁺ doped CaBAl glasses, under 405 nm excitation, exhibited two …