White light emission and energy transfer of LaMgAl₁₁ O₁₉ :Eu³⁺ , Tb³⁺ phosphors

White-light-tunable LaMgAl₁₁ O₁₉ :x%Tb³⁺ , y%Eu³⁺ series phosphors were prepared using the gel-combustion method. The structure and luminescence properties were studied, and the energy transfer of Eu³⁺ and Tb³⁺ in the LaMgAl₁₁ O₁₉ system was also discussed. The results showed that the LaMgAl₁₁ O₁₉ matrix exhibited strong emission in the blue-light region under the excitation of ultraviolet light, which resulted in conditions suitable for the preparation of white-light-tunable phosphors. The emission spectra of LaMgAl₁₁ O₁₉ :2%Tb³⁺ , y%Eu³⁺ (y = 2%-9%) series phosphors were obtained through optimization experiments. It could be seen from the CIE diagram that by adjusting the doping quantities of Eu³⁺ and Tb³⁺ in the LaMgAl₁₁ O₁₉ host, multicolor luminescence and white light emission in a single host could be achieved. By calculating the energy transfer efficiency and critical distance between Eu³⁺ and Tb³⁺ series phosphors, the mechanism of energy transfer between Tb³⁺ and Eu³⁺ was found to be the interaction between electric quadruples.