非均相沉淀法制备Ba_3MgSi_2O_8:Eu^(2+),Mn^(2+)荧光粉

Preparation of Eu-and Mn-Codoped Ba_3MgSi_2O_8 Phosphor through Heterogeneous Precipitation

用非均相沉淀法首次合成了名义化学式为Ba2.88MgSi2O8:0.02Eu2+,0.1Mn2+的Eu2+、Mn2+共掺杂Ba3MgSi2O8荧光粉。用XRD、SEM和荧光光谱进行表征,并与相同条件下用高温固相法合成的荧光粉作对比。研究沉淀反应温度、金属离子浓度对非均相沉淀法制备荧光粉相纯度和发光性能的影响。结果表明:相对于高温固相法,非均相沉淀法可在更低的温度下合成相纯度高的荧光粉,且粉末颗粒呈近球状,粒径均匀,粉末基本无团聚;沉淀反应温度为40℃,在此温度下,金属离子溶液滴加完毕后,继续搅拌2h,并在室温下陈化24h,金属离子浓度为0.30mol/L左右时为最宜。

Eu2＋ and Mn2＋ co-doped Ba3MgSi2O8 phosphor was first prepared by heterogeneous precipitation method.Its nominal chemical formula is Ba2.88MgSi2O8： 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 solid-state 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.