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相关概念视频

Photoluminescence: Fluorescence and Phosphorescence01:23

Photoluminescence: Fluorescence and Phosphorescence

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Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...
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Photoluminescence: Applications01:14

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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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Luminescence, the emission of light by a substance that has absorbed energy, is a process that involves the interaction of molecules with light. The energy-level diagram, or Jablonski diagram, is a graphical representation of these interactions, illustrating the various states and transitions a molecule can undergo. In a typical Jablonski diagram, the lowest horizontal line represents the ground-state energy of the molecule, which is usually a singlet state. This state represents the energies...
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在CsPbBr3微晶中来自深层陷的NIR发光.

Jonathan Vandenwijngaerden1, Bapi Pradhan1, Bob Van Hout1

  • 1Molecular Imaging and Photonics, Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium.

The journal of physical chemistry letters
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研究人员观察到含化 PeroVskite 微晶体中的近红外 (NIR) 辐射. 这种排放源于深陷状态,揭示了对矿重组路径的新见解.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 固态物理 固态物理
  • 光电学是指光电子产品.

背景情况:

  • 全无机矿如CsPbBr3和CsPb(Br/Cl) 3是有前途的光电子材料.
  • 了解它们的兴奋状态动态和排放特性对于设备应用至关重要.

研究的目的:

  • 报告CsPbBr3和CsPb(Br/Cl) 3矿微晶体中近红外 (NIR) 辐射的首次观察.
  • 为了调查这种NIR发射的起源和特征.
  • 量化确定这种排放路径的量子产量和动态.

主要方法:

  • 温度和功率依赖的NIR和可见发光光谱学.
  • 时间分辨率的发光光谱学 (比秒到纳秒的时间尺度).

主要成果:

  • 在CsPbBr3和CsPb(Br/Cl) 3微晶体中观察宽带NIR发射频段.
  • 证明NIR发射源于涉及深陷状态的辐射过渡.
  • 深陷排放量子收益率的定量确定 (在室温下约为0.3%).
  • 在660秒的时间尺度上对NIR状态群体的观察,与深陷捕获载体相一致.

结论:

  • 深陷状态有助于金属化物矿微晶中的辐射重组.
  • 这项研究揭示了这些材料中以前未被探索的重组通道.
  • 这些发现增强了对矿光物理学和潜在应用的基本理解.