不同冷却方式对Er^(3+)/Yb^(3+)共掺BaF_2粉末上转换发光效率的影响  

Effect of Different Cooling Techniques on Up-converted Fluorescence Efficiency of Er^(3+)/Yb^(3+) Co-doped BaF_2 Powder

作　　者：张向华[1,2] 肖思国[3] 丁庆磊[3] 夏艳琴[3] 刘政威[3,4] 

机构地区：[1]湖南工程学院电气与信息工程系 [2]湘潭大学材料与光电物理学院现代物理研究所,湘潭411105 [3]湘潭大学材料与光电物理学院现代物理研究所 [4]湘潭大学先进材料及其流变特性教育部重点实验室,湘潭411105

出　　处：《硅酸盐通报》2006年第6期67-71,共5页Bulletin of the Chinese Ceramic Society

基　　金：国家"863"项目(No.2002AA324030);湖南省教育厅优秀青年教师基金(No.03B039);湖南省自然科学基金(No.04JJ3041)

摘　　要：采用液氮制冷和空冷两种冷却方式制备了不同烧结温度的系列相同配方Er3+/Yb3+共掺杂BaF2粉末。与同一烧结温度采用空冷制得的样品相比较,液氮制冷可将样品的上转换荧光强度提高20倍。各样品的XRD图谱表明,经两种方式冷却后样品的晶体结构没有明显区别,但采用液氮制冷制得样品的BaF2平均晶格常数a和样品中Yb2O3含量均较采用空冷制得样品的相应参数略有减小,由此可知液氮制冷有利于更多稀土离子替代基质材料中的Ba2+成为发光中心,提高了样品的上转换发光效率。A series of Er^3＋/Yb^3＋ co-doped BaF2 powders with the same compositions were prepared at different sintering temperatures, and the samples were cooled by liquid-nitrogen refrigerating and aircooling, respectively. It was detected that the up-converted fluorescence intensity could be enhanced 20 times with liquid-nitrogen refrigerating than that with air-cooling. The crystal structures of samples show no apparent difference by X-ray powder diffraction （XRD）. However, compared with the samples coded by air-cooling, the lattice parameter of BaF2 and the concentration of Yb2O3 in the samples cooled by liquid-nitrogen refrigerating were both smaller. It was induced that more rare earth ions substituted the Ba^2＋ as sensitizing center with liquid-nitrogen refrigerating, which enhanced the efficiency of upconverting fluorescence of samples.

关 键 词：上转换 BaF2 液氮制冷 空冷 晶格常数 

分 类 号：TQ171.112[化学工程—玻璃工业]