<p>The article investigates the photoluminescence characteristics of white and yellowish-white phosphors Sr₃LiSbO₆: xDy³⁺ when excited by UV and near-UV light. The samples were synthesized through a solid-state reaction method at 1000&#xa0;°C. The structural properties of the samples were investigated through XRD, FESEM, HRTEM, FTIR, Raman and XPS studies. Optical properties were investigated using UV–Vis diffuse reflectance and photoluminescence (PL) excitation and emission spectra. The optical band gap increased with increasing Dy³⁺ doping, but it started to decrease after 3&#xa0;mol% doping of the Dy³⁺ rare earth ion. Photoluminescence excitation (PLE) spectra show various Dy³⁺ peaks. Decay curves were fitted well with a single exponential function based on these excitation and emission wavelengths. Photometric studies, including CIE coordinates, color purity, and CCT values, were calculated, indicating that the Sr₃LiSbO₆: x Dy³⁺ phosphor can emit a single phase of yellowish-white to white light with optimal color purity and CCT values. These findings suggest that this phosphor could be promising white and yellowish-white phosphor material in white LEDs and Lasers.</p>