[en] A series of potassium lanthanum praseodymium ternary bromides, K₂La_1-xPr_xBr₅ (0.02 ≤ x ≤ 1) single crystals was grown by the Bridgman technique. The high resolution absorption, luminescence and excitation spectra were measured at 4, 77 and 293 K under different excitation sources, including VUV synchrotron radiation. The Stark components determined from the absorption and emission spectra were simulated by using a phenomenological crystal-field model for 4f² configuration of the Pr³⁺ ion in K₂PrBr₅. The comparison is made with earlier reported data for Pr³⁺ in K₂PrCl₅ crystal. The decay times of the emission from the ¹D₂ and ³P₀ levels were measured and excited states dynamic is analysed