...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Time-resolved fluorescence measurements on Eu3+- and Eu2+-doped glasses
【24h】

Time-resolved fluorescence measurements on Eu3+- and Eu2+-doped glasses

机译：在Eu3 +和Eu2 +掺杂的玻璃上的时间分辨荧光测量

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Various fluoride, phosphate and borosilicate glasses with known properties and global structure have been doped with Eu3+ (4f(6)) at doping concentrations between 10(18) and 10(21) cm(-3). By applying reductive melting conditions Eu3+ could partially be transformed to Eu2+ (4f(7)). Four fluoroaluminate glasses with varying phosphate content between 0 and 20 mol% (FPx), a pure phosphate glass (P100) and two borosilicate glasses with low (DURAN(R)-like) and high optical basicity (NBS1) have been used for these investigations. The time-resolved fluorescence in the visible range has been studied for both ions. Although static and dynamic fluorescence of Eu3+ and Eu2+ are dramatically different (f-f-transitions for Eu3+; d-f-transitions for Eu2+), glass structure changes have a similar influence on the dynamic fluorescence behavior of both ions. A strongly ionic surrounding due to fluorine ligands as in fluoroaluminate glass samples provides the longest fluorescence lifetime (about 7 ms for Eu3+; about 1.3 mu s for Eu2+). Increasing phosphate content decreases the fluorescence lifetime due to more oxygen ligands. Interesting differences have been found for the two borosilicate glasses due to the difference in their optical basicity (Na2O/B2O3 ratio). Measurements indicate a homogeneous distribution of europium ions in most FP samples. NBS1 measurements suggest that two different local europium sites are formed. For Duran-like samples only one specific europium site was found, although these samples show phase separation at high doping concentrations into a SiO2-rich phase and borate- and europium-rich droplets. Fluorescence quenching due to energy transfer from Eu2+ to Eu3+ could be found for co-doped samples; Eu3+-doped samples show no fluorescence quenching.
机译：各种具有已知特性和整体结构的氟化物，磷酸盐和硼硅酸盐玻璃已被Eu3 +（4f（6））掺杂，掺杂浓度在10（18）和10（21）cm（-3）之间。通过应用还原性熔化条件，Eu3 +可以部分转化为Eu2 +（4f（7））。这些已使用了四种磷酸盐含量在0到20 mol％（FPx）之间的氟铝酸盐玻璃，纯磷酸盐玻璃（P100）和两块低（DURAN？-like）和高光学碱度的硼硅酸盐玻璃（NBS1）。调查。已经研究了两种离子在可见光范围内的时间分辨荧光。尽管Eu3 +和Eu2 +的静态和动态荧光存在显着差异（Eu3 +的f-f-跃迁; Eu2 +的d-f-跃迁），但玻璃结构的变化对两种离子的动态荧光行为都有相似的影响。如氟铝酸盐玻璃样品中的氟配体所形成的强离子周围环境提供最长的荧光寿命（Eu3 +约为7毫秒; Eu2 +约为1.3毫秒）。由于更多的氧配体，增加磷酸盐含量会缩短荧光寿命。由于这两种硼硅酸盐玻璃的光学碱度（Na2O / B2O3比）不同，因此发现了有趣的差异。测量结果表明，大多数FP样品中of离子的分布均匀。 NBS1测量表明形成了两个不同的本地local位。对于类似Duran的样品，仅发现了一个特定的site位点，尽管这些样品在高掺杂浓度下会发生相分离，变成富含SiO2的相以及富含硼酸盐和euro的液滴。对于共掺杂的样品，可以发现由于能量从Eu2 +转移到Eu3 +而引起的荧光猝灭。掺杂Eu3 +的样品没有荧光猝灭。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号