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相关概念视频

UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

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In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
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Molecular Spectroscopy: Absorption and Emission01:14

Molecular Spectroscopy: Absorption and Emission

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Molecules possess discrete energy levels called quantum states. Unlike atoms, which have simpler energy levels, molecules possess additional rotational and vibrational energy levels.  Each energy level is separated by an energy gap, with the gaps between adjacent electronic, vibrational, and rotational levels varying significantly. The three types of energy levels in a diatomic molecule are shown in Figure 1.
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IR Absorption Frequency: Delocalization01:04

IR Absorption Frequency: Delocalization

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Electron delocalization refers to the distribution of electrons across multiple atoms within a molecule rather than being confined to a single atom or bond. This phenomenon is common in systems with conjugated bonds—structures where alternating single and double bonds allow π-electrons to move freely across the network. The movement of electrons stabilizes the molecule and can affect various chemical properties, including vibrational frequencies observed in IR spectroscopy.
In IR...
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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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The Energies of Atomic Orbitals03:21

The Energies of Atomic Orbitals

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In an atom, the negatively charged electrons are attracted to the positively charged nucleus. In a multielectron atom, electron-electron repulsions are also observed. The attractive and repulsive forces are dependent on the distance between the particles, as well as the sign and magnitude of the charges on the individual particles. When the charges on the particles are opposite, they attract each other. If both particles have the same charge, they repel each other.
29.9K
IR Absorption Frequency: Hybridization01:21

IR Absorption Frequency: Hybridization

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Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that...
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相关实验视频

Updated: Jan 18, 2026

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

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在近红外发射量子中结合激发综合体.

Dulanjan Harankahage1,2, Divesh Nazar1,2, Korneel Molkens3,4,5

  • 1The Center for Photochemical Sciences, Bowling Green, Ohio 43403, United States.

ACS nano
|January 15, 2026
PubMed
概括
此摘要是机器生成的。

体量子为近红外 (NIR) 光源提供了低成本的替代方案. 研究人员设计了量子来抑制Auger重组,实现高效的NIR发射和探索新的光子现象.

关键词:
奥格尔重组的重组方式光纤光学 纤维光学接近红外线的近红外线摄影探测器是一种光检测器.量子点是一个量子点.电信 电信 电信 电信 电信

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Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
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Last Updated: Jan 18, 2026

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Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
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科学领域:

  • 材料科学 材料科学 材料科学
  • 纳米技术 纳米技术
  • 光电学是指光电子产品.

背景情况:

  • 体半导体纳米晶体 (NCs) 是近红外 (NIR) 光生成的表轴平台的经济有效的替代品.
  • 增强器重组显著限制了NIRNC的性能,特别是在狭带间隙材料中.

研究的目的:

  • 在体半导体纳米晶体中设计量子外 (QSs) 用于抑制的非辐射Auger过程.
  • 研究新型CdS/HgS/CdS和CdS/HgCdSe/ZnS QS的光学特性和增益机制.

主要方法:

  • 制造球形量子井 (CdS/HgS/CdS和CdS/HgCdSe/ZnS QS) 的工程.
  • 光发光量子产量测量. 光发光量子产量测量.
  • 光学增益和刺激辐射测量.
  • 暂时吸收光谱学. 暂时吸收光谱学.

主要成果:

  • 质量测试显示可调节的NIR发射具有高光发光量子产量 (在1000nm以下高达60%,在1300nm附近高达30%).
  • CdS/HgS/CdS QS显示光学增益和刺激发射.
  • CdS/HgCdSe/ZnS QSs显示出更强的奥格抑制,但表现出光诱导吸收而不是增益.
  • 暂时的吸收揭示了CdS/HgCdSe/ZnS QS中结合的多兴奋素复合体,导致子带隙状态.

结论:

  • 工程QS有效地抑制了Auger重组,从而实现了高效的NIR发射.
  • 不同的QS组合导致不同的光学现象,包括增益和光感应吸收.
  • 在QS中结合的多刺激体复合体为室温非线性NIR光子应用开辟了通路.