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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.
4.3K
IR Absorption Frequency: Delocalization01:04

IR Absorption Frequency: Delocalization

1.3K
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...
1.3K
Colors and Magnetism03:02

Colors and Magnetism

14.0K
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...
14.0K
The Energies of Atomic Orbitals03:21

The Energies of Atomic Orbitals

29.9K
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

1.2K
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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関連する実験動画

Updated: Jan 18, 2026

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
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近赤外発光量子シェルにおける束縛励起子錯体

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
まとめ

コロイド量子シェルは、近赤外（NIR）光源の低コスト代替品を提供します。研究者たちは、オージェ再結合を抑制するように量子シェルを設計し、効率的なNIR放射を達成し、新しいフォトニック現象を探求しました。

キーワード:
オージェ再結合光ファイバー近赤外線光検出器量子ドット通信

さらに関連する動画

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
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関連する実験動画

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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
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Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

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科学分野:

  • 材料科学
  • ナノテクノロジー
  • オプトエレクトロニクス

背景:

  • コロイド半導体ナノ結晶（NC）は、近赤外（NIR）光生成のためのエピタキシャルプラットフォームの費用効果の高い代替手段です。
  • オージェ再結合は、特に狭帯域材料において、NIR NCの性能を著しく制限します。

研究 の 目的:

  • コ​​ロイド半導体ナノ結晶における非放射オージェプロセスを抑制するように量子シェル（QS）を設計すること。
  • 新しいCdS/HgS/CdSおよびCdS/HgCdSe/ZnS QSの光学的特性と利得メカニズムを調査すること。

主な方法:

  • 球状量子井戸（CdS/HgS/CdSおよびCdS/HgCdSe/ZnS QS）の作製。
  • フォトルミネッセンス量子収率測定。
  • 光ゲインおよび誘導放出測定。
  • 過渡吸収分光法。

主要な成果:

  • QSは、高いフォトルミネッセンス量子収率（1000 nm未満で最大60％、1300 nm付近で30％）で調整可能なNIR放射を示しました。
  • CdS/HgS/CdS QSは、光ゲインと誘導放出を示しました。
  • CdS/HgCdSe/ZnS QSは、より強いオージェ抑制を示しましたが、ゲインではなく光誘起吸収を示しました。
  • 過渡吸収により、CdS/HgCdSe/ZnS QSにおける束縛マルチエキシトン錯体が明らかになり、バンドギャップ下の状態につながりました。

結論:

  • 設計されたQSはオージェ再結合を効果的に抑制し、効率的なNIR放射を可能にします。
  • 異なるQS組成は、利得や光誘起吸収を含む、異なる光現象につながります。
  • QSにおける束縛マルチエキシトン錯体は、室温での非線形NIRフォトニック応用の経路を開きます。