Abstract: Na⁺-doped Li_1-xNa_xNbO₃: Pr³⁺ phosphors were prepared with the high temperature solid-state method. Without changing the crystal structure, the emission intensity of blue light excitation in Li_1-xNa_xNbO₃: Pr³⁺ was improved by doping Na⁺ and the optimal stoichiometric ratio x was 0.05. Then the phosphors were bonded to the aluminum alloy plate and the photoluminescence intensity of LiNbO₃: Pr³⁺ increased sharply with the increase of stress by applying tensile force to the metal plate and it gradually disappeared with the increase of the content of Na⁺ dopants because Na⁺ doping changed the asymmetry around Pr³⁺ and affected the luminescence characteristics induced by LiNbO₃: Pr³⁺.