LIU Xiaolan CHEN Yibin ZENG Renjie

(College of Materials, Xiamen University, Xiamen Fujian 361005)

Abstract: Eu²⁺ and Mn²⁺ co-doped Ba₃MgSi₂O₈ phosphor was first prepared by heterogeneous precipitation method. Its nominal chemical formula is Ba_2.88MgSi₂O₈: 0.02Eu²⁺, 0.1Mn²⁺. Heterogeneous precipitated phosphors were compared with solid-state reaction -driven phosphors by XRD, SEM and fluorescence spectra. Effects of metal ion concentration and precipitation reaction temperature on photoluminescent (PL) intensity of the phosphor were investigated. The results indicated that high purity phosphor could be obtained through heterogeneous precipitation for 4 h at 1200 ℃, a temperature lower than by solidstate method. The phosphor particles without agglomeration were nearly spherical and narrowly distributed. The optimum PL intensity and phase purity of the phosphor were obtained when the concentration of metal ion was at about 0.30 mol/L and the precipitation reaction temperature was 40 ℃. After the metal ion solution was added by dripping, the mixture was stirred for 2 h, and then aged at room temperature for 24 h.

Key words: europium; manganese; precipitation reaction temperature; emission intensity