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Polycrystalline blue-red luminescent BaAl_xO_y:Eu²⁺,Dy³⁺ phosphor powders were prepared by solution-combustion method at 500 °C for 5–6 min. Effect of boric acid (H₃BO₃) on structure, morphology and luminescence properties of blue-red phosphors BaAl_xO_y:Eu²⁺,Dy³⁺ was investigated. XRD pattern confirms that the crystal structure of synthesized sample changes from hexagonal to tetragonal phase and the crystallites size was found to be 39–53 nm range with boric acid concentration. The emission spectra showed that the phosphors prepared without boric acid has a main peak at 505 nm, while those with boric acid have a triple main peak at 480, 580 and 615 nm, correspond to the 5d → 4f transitions of Eu²⁺ ions. The results indicated that the main peak in the emission and excitation spectrum of phosphor nanoparticles with boric acid shifted to the short wavelength compare with the phosphor without boric …