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Related Concept Videos

UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

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 process,...
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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...
IR Absorption Frequency: Hybridization01:21

IR Absorption Frequency: Hybridization

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 stretch at a...
Molecular Spectroscopy: Absorption and Emission01:14

Molecular Spectroscopy: Absorption and Emission

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.
Atomic Spectroscopy: Absorption, Emission, and Fluorescence01:23

Atomic Spectroscopy: Absorption, Emission, and Fluorescence

Atomic spectroscopy is a vital tool in elemental analysis, both qualitatively and quantitatively. It can be broadly divided into optical spectroscopy, mass spectroscopy, and X-ray spectroscopy methods. The optical spectroscopic methods are atomic absorption spectroscopy (AAS), atomic emission spectroscopy (AES), and atomic fluorescence spectroscopy (AFS). The first step in all three methods is atomization, where the solid, liquid, or solution-phase samples are converted into gas-phase atoms and...
IR Absorption Frequency: Delocalization01:04

IR Absorption Frequency: Delocalization

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 spectroscopy,...

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Updated: Jun 16, 2026

Close-Space Sublimation-Deposited Ultra-Thin CdSeTe/CdTe Solar Cells for Enhanced Short-Circuit Current Density and Photoluminescence
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Tunable Near-Infrared Emission from CdSe/CdTe/CdSe Core/Shell/Shell Quantum Dots.

Conan Huang1, Yunpei Duan1, Nikolay S Makarov2

  • 1Department of Materials Science and Engineering and Seitz Materials Research Laboratory, The Grainger College of Engineering, University of Illinois at Urbana-Champaign, 1304 West Green Street, Urbana, Illinois 61801, United States.

The Journal of Physical Chemistry Letters
|March 20, 2025
PubMed
Summary
This summary is machine-generated.

This study presents a novel CdSe/CdTe/CdSe core/shell/shell quantum dot structure. These nanostructures achieve tunable red to near-infrared emission with high photoluminescence quantum yields and narrow line widths.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optoelectronics

Background:

  • Core/shell nanostructures enhance photoluminescence and charge separation in colloidal quantum dots.
  • Multishell motifs expand emission spectral range and tune electron/hole wave functions.

Purpose of the Study:

  • Explore CdSe/CdTe/CdSe core/shell/shell structures (diameter ≲7 nm).
  • Investigate how structural parameters affect optical properties.
  • Achieve tunable emission and high photoluminescence quantum yields.

Main Methods:

  • Synthesized CdSe/CdTe/CdSe core/shell/shell quantum dots.
  • Systematically varied core and shell dimensions.
  • Analyzed optical properties, including emission spectra and quantum yields.

Main Results:

  • Achieved red to near-infrared emission (677–1057 nm).
  • Obtained photoluminescence quantum yields up to 88% and narrow line widths (as low as 109 meV).
  • Demonstrated emission energy approaching theoretical band edge separation.

Conclusions:

  • CdSe/CdTe/CdSe core/shell/shell structures offer tunable optical properties.
  • Structural parameter control is key for optimizing band gap and electron-hole overlap.
  • These findings provide guidelines for designing advanced quantum dot materials.