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相关概念视频

Stereoisomerism02:52

Stereoisomerism

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
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Colors and Magnetism03:02

Colors and Magnetism

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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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Crystal Field Theory - Octahedral Complexes02:58

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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
26.4K

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Synthesis of Core-shell Lanthanide-doped Upconversion Nanocrystals for Cellular Applications
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在单核兰化物共晶组件中进行光学上升转换.

Yuxin Wang1, Guotao Sun2, Qichen Su1

  • 1Department of Chemistry, College of Sciences, Shanghai University, Shanghai, 200444, China.

Chemistry (Weinheim an der Bergstrasse, Germany)
|April 23, 2024
PubMed
概括
此摘要是机器生成的。

研究人员开发了用于化物上转换发光的共同晶体系统. 最优的Yb3+与兰坦化物 (Er3+或Pr3+) 的比率为1:1,使得光发效率高.

关键词:
Pr3+ 和 Er3+ 的上升转换发光.共同晶体组件组件组件兰化物复合物 兰化物复合物分子上升转换转换.

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科学领域:

  • 无机化学 无机化学
  • 材料科学 材料科学 材料科学
  • 发光的光度是非常的低.

背景情况:

  • 兰化物离子表现出独特的光发光特性.
  • 上转换发光 (UCL) 允许低能光子转换为高能光子.
  • Yb3+敏感化是一种常见的策略,用于增强在兰化物系统中的UCL.

研究的目的:

  • 开发用于化物上转换发光的新型联合晶体组装系统.
  • 研究Yb3+敏感化对Er3+和Pr3+上转换的影响.
  • 阐明负责UCL的能量传递机制.

主要方法:

  • 离散单核Yb3+/Er3+和Yb3+/Pr3+联合晶体组件的合成.
  • 使用单晶X射线衍射的晶体结构和组成的表征.
  • 在980nm激发下进行光发光谱学,以研究上升转换发光.

主要成果:

  • 成功开发了两个共同晶体系统,通过Yb3+敏感化实现了Er3+和Pr3+UCL.
  • 对于Er3+和Pr3+系统来说,最强的UCL是在Yb3+:Ln3+摩尔比率为1:1时观察到的.
  • 能源转移机制被确定为Er3+的能量转移上转换和Pr3+的能量转移和合作敏感化上转换的组合.

结论:

  • 这项研究表明,在离散的兰坦化联合晶体组合中,有效的Yb3+敏感化升级转换发光.
  • 这些发现强调了Yb3+:Ln3+摩尔比对优化UCL强度的重要性.
  • 这项工作展示了在室温下Pr3+上转换发光的第一个分子层次的演示,扩大了兰化物发光的领域.