Abstract: The Na⁺, Dy³⁺, Eu³⁺ doped YAG series phosphors were prepared by high-temperature solid-phase method. Change the doped Dy³⁺ concentration, excitation wavelength, and doped Na⁺ to study its influence on luminescence. X-ray diffraction results show that the doping of boric acid, Na⁺, Dy³⁺, Eu³⁺ does not affect the cubic phase of YAG, and with the increase of Na⁺, Dy³⁺, Eu³⁺ concentration, the sample diffraction peak position shifts to a small angle. Use λ_em=590 nm to monitor Dy³⁺, 15%Eu³⁺ co-doped YAG powder, with the increase of Dy³⁺ concentration, the excitation intensity of Eu³⁺ and Dy³⁺ both increase first and then decrease. When λ_ex=366 nm is used to excite Dy³⁺, 15%Eu³⁺ co-doped YAG, at this time, there is an energy transfer of Eu³⁺→Dy³⁺, the calculated energy transfer efficiency of Eu³⁺→Dy³⁺ is 84.23%.Compared with 10%Dy³⁺, 15%Eu³⁺ co-doped YAG, the Dy³⁺ luminescence in the sample is enhanced by 1.5 times after doping 0.5%Na⁺, the color coordinate is (0.348 1,0.397), and the color temperature is 5 010 K, which is close to standard white light. When λ_ex=394 nm is used to excite Dy³⁺, 15%Eu³⁺ co-doped YAG, at this time, there is energy transfer from Dy³⁺→Eu³⁺, the calculated energy transfer efficiency of Dy³⁺→Eu³⁺ is 88.9%. Compared with 10%Dy³⁺, 15%Eu³⁺ co-doped YAG, Eu³⁺ luminescence is enhanced 1.8 times after doping 0.5%Na⁺, the color coordinate is (0.466 7, 0.416 8), and the color temperature is 2 650 K, which meets the commercial warm white light standard.

Key words: Na⁺, Dy³⁺, Eu³⁺ doped YAG phosphor, high-temperature solid-phase method, energy transfer, fluorescence lifetime, color coordinate, color temperature