Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.1K
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
1.1K
UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

1.6K
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...
1.6K
NMR Spectroscopy: Chemical Shift Overview01:15

NMR Spectroscopy: Chemical Shift Overview

1.6K
The position of the absorption signal of a sample is reported relative to the position of the signal of tetramethylsilane (TMS), which is added as an internal reference while recording spectra. The difference between the absorption frequencies of the sample and TMS (in Hz) is divided by the spectrometer operating frequency (in MHz) to obtain a dimensionless quantity called the chemical shift. It is reported on the δ (delta) scale and expressed in parts per million.
For instance, the proton...
1.6K
Molecular Spectroscopy: Absorption and Emission01:14

Molecular Spectroscopy: Absorption and Emission

2.4K
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.
2.4K
IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

1.4K
A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to...
1.4K
π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

1.1K
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
1.1K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Radiative dynamics of AgIn(1-x)GaxS2 quantum dots.

The Journal of chemical physics·2026
Same author

Ligand effects on the angular momentum fine structure of CdTe quantum dots.

The Journal of chemical physics·2025
Same author

Overcoming aggregation-induced quenching in DNA-assembled rhodamine dimers.

Physical chemistry chemical physics : PCCP·2025
Same author

Angular Momentum Fine Structure in InP/ZnSe Quantum Dots.

The journal of physical chemistry letters·2024
Same author

Comment on "Dependence of the Fluorescent Lifetime Ï„ on the Concentration at High Dilution".

The journal of physical chemistry letters·2022
Same author

Identity of the reversible hole traps in InP/ZnSe core/shell quantum dots.

The Journal of chemical physics·2022

Related Experiment Video

Updated: Jul 15, 2025

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
12:57

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

Published on: October 13, 2017

9.2K

Spectral widths and Stokes shifts in InP-based quantum dots.

Paul Cavanaugh1, Xudong Wang2, Maria J Bautista2

  • 1Department of Chemistry and Biochemistry, University of California Merced, 5200 North Lake Road, Merced, California 95343, USA.

The Journal of Chemical Physics
|October 3, 2023
PubMed
Summary
This summary is machine-generated.

Indium phosphide (InP) quantum dots exhibit larger spectral shifts than other types, primarily due to electron-hole exchange interactions. Core size and shell deposition influence these shifts, with interface effects also contributing to spectral width.

More Related Videos

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
10:40

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

Published on: June 28, 2016

7.6K
Synthesis of In37P20O2CR51 Clusters and Their Conversion to InP Quantum Dots
08:21

Synthesis of In37P20O2CR51 Clusters and Their Conversion to InP Quantum Dots

Published on: May 7, 2019

9.9K

Related Experiment Videos

Last Updated: Jul 15, 2025

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
12:57

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

Published on: October 13, 2017

9.2K
High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
10:40

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

Published on: June 28, 2016

7.6K
Synthesis of In37P20O2CR51 Clusters and Their Conversion to InP Quantum Dots
08:21

Synthesis of In37P20O2CR51 Clusters and Their Conversion to InP Quantum Dots

Published on: May 7, 2019

9.9K

Area of Science:

  • Materials Science
  • Nanotechnology
  • Quantum Physics

Background:

  • Indium phosphide (InP) quantum dots (QDs) show larger Stokes shifts and photoluminescence (PL) line widths compared to II-VI semiconductor QDs at similar exciton energies.
  • Understanding the origins of these spectral characteristics is crucial for optimizing QD performance in various applications.

Purpose of the Study:

  • To investigate the mechanisms responsible for the larger Stokes shifts and broader spectral widths in InP-based quantum dots.
  • To analyze the influence of core size, shell deposition, and core-shell interface properties on spectral characteristics.

Main Methods:

  • Comparative analysis of Stokes shifts across different semiconductor materials (InP, CdTe, CdSe).
  • Investigation of Stokes shift dependence on quantum dot core size and ZnSe shell deposition.
  • Analysis of photoluminescence (PL) and PL excitation (PLE) spectra to assess broadening mechanisms.
  • Luminescence polarization measurements to support assignments of spectral features.

Main Results:

  • Stokes shift order: InP > CdTe > CdSe; decreases with core size and ZnSe shell deposition.
  • Stokes shift attributed to angular momentum fine structure differences, controlled by electron-hole exchange interaction.
  • Two types of inhomogeneous broadening identified: size inhomogeneity and core-shell interface inhomogeneity (due to interfacial dipoles).
  • Interface inhomogeneity, comparable to size inhomogeneity, explains spectral widths and hole trapping dynamics.

Conclusions:

  • Electron-hole exchange interaction significantly influences Stokes shifts in InP QDs.
  • Core-shell interface properties, specifically band offset distributions from interfacial dipoles, are critical contributors to spectral broadening.
  • The findings provide a deeper understanding of spectral properties in InP/ZnSe/ZnS core-shell quantum dots.