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相关概念视频

Photoluminescence: Applications01:14

Photoluminescence: Applications

Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...

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Low-energy Cathodoluminescence for (Oxy)Nitride Phosphors
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一种含有通过组合方法确定的一维链的稀土.

Danielson1, Devenney, Giaquinta

  • 1Symyx Technologies, 3100 Central Expressway, Santa Clara, CA 95051, USA. The authors all contributed equally to this work.

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|February 18, 1998
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概括

研究人员通过高通量选发现了一种新型发光无机氧化物,酸 (Sr2CeO4). 这种材料呈现出蓝白光辐射,源于其晶体结构内的独特的电荷转移过程.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 无机化学 无机化学
  • 固态物理 固态物理

背景情况:

  • 组合材料选加速了新型化合物的发现.
  • 发光无机氧化物对于各种光电子应用至关重要.
  • 了解结构属性关系是设计先进材料的关键.

研究的目的:

  • 通过自动化合成和选来识别新的发光无机氧化物.
  • 描述Sr2CeO4.4的结构,光学和电子特性.
  • 为了阐明观察到的发光背后的机制.

主要方法:

  • 自动化薄膜合成用于组合图书馆创建 (>25,000名成员).
  • 粉末X射线衍射用于结晶结构的确定.
  • 光学光谱学 (发射光谱,量子产量,激发状态寿命测量).
  • 电子自旋共振和磁感应度的测量.

主要成果:

  • 发现和识别了一种新型发光无机氧化物,Sr2CeO4.4.
  • 结构分析显示,由Sr2+离子分离的边缘共享CeO6八面体的1D链.
  • 观测到的蓝白辐射最大在485nm,量子收益率为0.48±0.02.
  • 有证据表明,发光源源于连接物到金属Ce4+电荷转移.

结论:

  • Sr2CeO4是用于发光应用的有前途的新材料.
  • 独特的1D链结构影响其光学特性.
  • 体到金属的电荷转移是Sr2CeO4.4中的主要发光机制.