Abstract <p>This work explores the structural, morphological, and luminescent characteristics of Yb³⁺-doped K₂La_1–<i>x</i>Yb_<i>x</i>(PO₃)₅ phosphors, synthesized with varying ytterbium concentrations (<i>x</i> = 0.005, 0.01, 0.05, 0.2). Scanning Electron Microscopy analysis reveals a polycrystalline microstructure with irregular grains and uniform Yb³⁺ distribution, confirmed by Energy Dispersive Spectroscopy. X-ray Diffraction patterns indicate a stable monoclinic phase with slight lattice strain at higher doping levels, while Fourier Transform Infrared spectroscopy verifies the integrity of the phosphate framework despite local distortions. Luminescence measurements under 892 nm excitation exhibit characteristic near-infrared emission around 992 nm, with optimal intensity observed at 5% Yb³⁺ concentration. The decay time decreases with increasing doping due to quenching effects but is still usable for photonic applications. These results suggest the suitability of K₂La_1–<i>x</i>Yb_<i>x</i>(PO₃)₅ as a promising candidate for near-infrared emitting materials, especially at intermediate dopant levels.</p>