Abstract: A series of Eu³⁺-doped borate-based phosphors were synthesized by high temperature solid-state method in air atmosphere. The crystal phase and luminescence properties of phosphors were characterized by X-ray diffraction, fluorescence spectroscopy and chromaticity coordinates. Through the mutual substitution between alkali metals and alkaline earth metals in the LiBaB₉O₁₅, the effect of the change of the matrix composition on the luminescence properties of phosphors was investigated. In the series of Li(Na, K)Ba(Sr, Ca)B₉O₁₅∶0.07Eu³⁺phosphors, LiSrB₉O₁₅∶0.07Eu³⁺phosphor has the strongest emission intensity. The effects of calcination temperature, holding time and Eu³⁺ doping concentration on the crystal phase and luminescence properties of LiSrB₉O₁₅∶Eu³⁺ phosphor were investigated. When the calcination temperature is 750 ℃ and holding time is 1~5 h, the crystallinity of all the samples is good. When the Eu³⁺ doping concentration is 0.52, LiSrB₉O₁₅∶Eu³⁺ phosphor has the strongest luminescence intensity. When x≥0.42(x=0.42, 0.47, 0.52, 0.57), the color coordinates of LiSrB₉O₁₅∶xEu³⁺ are close to the standard red light (0.67, 0.33). The relative intensity ratio R of the emission peak at 611 nm (⁵D₀→⁷F₂) and 586 nm (⁵D₀→⁷F₁) of LiSrB₉O₁₅∶xEu³⁺(x=0.02~0.57) phosphors were compared. R value is not changed obviously, the majority of Eu³⁺ in the crystal lattice locates in inversion symmetry center sites. The luminescence properties of the LiSrB₉O₁₅∶0.52Eu³⁺ phosphor and the commercial Y₂O₃∶Eu³⁺ phosphor were compared, the luminescence intensity of LiSrB₉O₁₅∶0.52Eu³⁺phosphor is weaker than Y₂O₃∶Eu³⁺ phosphor under excitation of 260 nm wavelength, stronger than Y₂O₃∶Eu³⁺ phosphor under excitation of 362 nm and 394 nm wavelength.

Key words: borate matrix, high temperature solid-state method, phosphor, luminescence property, Eu³⁺ doping