Abstract: The luminophors of silicates Li_0.3MeAl_0.3SiO₃:Eu, Bi (Me=Mg, Ca, Sr, Ba) were synthesized and luminescence properties of Bi³⁺ and Eu³⁺ ions were studied. The effects and regularities of Me (Ⅱ) ions on the luminescence of Eu³⁺ and Bi³⁺ ions were also investigated. The study on the luminescence of silicates Li_0.3MeAl_0.3SiO₃:Eu, Bi indicated that there were energy transitions from the Bi³⁺ ion to Eu³⁺ ion and that Bi³⁺ions acted as both sensitizer and co-activator. The best promoting result of Bi³⁺ to Eu³⁺ was obtained when Me was Sr, i. e. the relative intensity was the highest by exciting the Bi³⁺ ion. The main emission of the Eu³⁺ion was from ⁵D₀-⁷F₁ transition for Me=Mg, Oa, Sr, and from ⁵D₀-⁷F₂ for Ba.
Under UV excitation of 395nm, the luminescence intensity of Eu³⁺ in Li_0.3BaAl_0.3SiO₃:Eu was 2 times that of Y(V, P)O₄:Eu, for both, of ⁵D₀-⁷F₁ and of ⁵D₀-⁷F₂ transition emissions. The experiment results demonstrated that the optimum synthesis condition was 950℃ and 4 hours sintered in twice and silicate Li_0.3BaAl_0.3SiO₃ was an excellent host lattice to obtain efficient photoluminescence materials.

Key words: Inorganic materials, photoluminescence, silicate