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Related Concept Videos

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Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...
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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.
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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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In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
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Related Experiment Video

Updated: Mar 26, 2026

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
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Quantum Yield Heterogeneity among Single Nonblinking Quantum Dots Revealed by Atomic Structure-Quantum Optics

Noah J Orfield1,2, James R McBride1,2, Feng Wang3

  • 1Department of Chemistry, Vanderbilt University , Nashville, Tennessee 37235, United States.

ACS Nano
|February 6, 2016
PubMed
Summary

Heterogeneity in quantum dot optical behavior stems from charging, not structure. Most giant quantum dots (g-QDs) are emissive, with "dark" states linked to core passivation.

Keywords:
correlationheterogeneitynanocrystal atomic structurenanocrystal quantum dotquantum yield

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Colloidal nanostructures exhibit optical behavior heterogeneity due to physical variations.
  • Understanding nanoscale structure-function correlations requires single-nanostructure analysis of atomic structure and photophysics.

Purpose of the Study:

  • To investigate the origins of quantum yield inhomogeneity in single giant cadmium selenide/cadmium sulfide core/shell quantum dots (g-QDs).
  • To correlate atomic structure, chemical composition, and photophysics at the single-nanocrystal level.
  • To determine the factors contributing to nonemissive "dark" states in g-QDs.

Main Methods:

  • Simultaneous analysis of atomic structure, chemical composition, and time-resolved single-photon photoluminescence for individual g-QDs.
  • Characterization of single exciton and biexciton quantum yields.
  • Investigation of nanocrystal charging and passivation states.

Main Results:

  • Single g-QDs display inhomogeneous quantum yields, primarily due to variations in charging, not structural differences.
  • A minimal fraction (<2%) of nonemissive "dark" g-QDs was observed.
  • Direct evidence indicates that a lack of inorganic passivation on the g-QD core is necessary for a "dark" state.

Conclusions:

  • Ensemble photoluminescence quantum yield in g-QDs is mainly governed by charging processes, unlike conventional QDs.
  • The limited "dark" fraction suggests charging is the dominant factor in observed QD heterogeneity.
  • Core passivation is critical for achieving high quantum yields and minimizing dark states in g-QDs.