红色荧光材料的研究现状

从激活剂种类入手,按不同基质体系概述了红色荧光材料的研究现状,介绍了不同激活剂离子在不同基质中的发光性能,以及不同基质的荧光粉具有的优缺点,并对红色荧光粉的未来进行了展望。     

Synthesis of LiEu1-xBix（MoO4）2 red phosphors by sol-gel method and their luminescent properties

The Bi3+ doped molybdate-based red-emitting phosphors, LiEu1-xBix(MoO4)2, were successfully synthesized with a sol-gel method. The prepared LiEu1-xBix(MoO4)2 phosphors exhibited pure and intense red emission at 613 nm under the excitation of near-UV 394 nm. It was discussed in detail that the influence of the synthesis conditions such as the doping concentration of Bi3+, the dose of citric acid, pH of the precursor solution and the sintering temperature on the emission intensity of the phosphors. According to the results, the optimal condition was obtained: the doping concentration of Bi3+ was 15 mol.%, molar ratio of citric acid to metal ions was 1.5:1, pH of the precursor solution was 1.0 and the sintering temperature was 800 ?C. The X-ray diffraction (XRD) patterns of the LiEu0.85Bi0.15(MoO4)2 phosphor prepared under the optimal condition indicated that the phosphor was single phase with tetragonal scheelite structure. The Commission Internationale de l’E-clairage (CIE) chromaticity coordinates of LiEu0.85Bi0.15(MoO4)2 were (x=0.655, y=0.345), which were closer to the national television stan-dard committee (NTSC) standard values (x=0.670, y=0.330) than that of a commercial red phosphor of Y2O2S:Eu3+(x=0.630, y=0.350). This LiEu0.85Bi0.15(MoO4)2 red phosphor is a promising candidate for the fabrication of white light-emitting diode (W-LED) with near-UV chips.     

工业硅冶炼用煤指标的探讨

检测了5种煤源洗煤表征煤化程度的参数和用于表征煤工艺性能的参数,结合5种煤源洗煤在实际生产中的使用效果,对洗煤的部分指标作了对比分析,并对适合工业硅生产使用的洗煤指标进行了总结。     

DF-3絮凝剂产生菌培养条件的优化

从花园土壤中筛选到一株有絮凝能力的菌株编号为DF-3,在温度为30℃,通气量（以摇床转速表示）为160r／min时通过实验确定DF-3的最佳培养条件：初始pH为8;20g／L果糖和5g／L葡萄糖为碳源;0．3g／L蛋白胨,0．5g／L酵母膏,0．5g／L尿素和0．2g／L（NH4）2SO4为最佳氮源;无机盐为2g／LKH2PO4,5g／L K2HPO4和0．1g／L NaCl。在这种条件下培养36小时所产微生物絮凝剂对高岭土悬浊液的絮凝率超过90％。