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Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been...
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Related Experiment Video

Updated: May 6, 2026

Compact Quantum Dots for Single-molecule Imaging
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Ultrasensitive imaging in live cells using fluorescent quantum dots.

Sébastien Courty, Maxime Dahan

    Cold Spring Harbor Protocols
    |November 5, 2013
    PubMed
    Summary

    Semiconductor quantum dots (QDs) offer superior brightness and photostability for biological imaging. These fluorescent nanoparticles enable long-term, single-particle tracking of biomolecules using standard microscopy.

    Area of Science:

    • Nanotechnology
    • Biophysics
    • Materials Science

    Background:

    • Semiconductor quantum dots (QDs) are fluorescent nanoparticles with unique optical properties.
    • Traditional organic dyes and fluorescent proteins have limitations in brightness and photostability for advanced imaging.
    • QDs offer a potential alternative for high-performance biological imaging applications.

    Purpose of the Study:

    • To highlight the advantages of semiconductor quantum dots (QDs) for biological imaging.
    • To demonstrate the utility of QDs in tracking biomolecule motion.
    • To compare the performance of QDs against conventional fluorescent probes.

    Main Methods:

    • Utilizing semiconductor quantum dots (QDs) as fluorescent probes.
    • Conjugating QDs to specific biomolecules of interest.

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  • Employing standard fluorescence microscopy techniques for detection and tracking.
  • Evaluating QD brightness and photostability over extended observation periods.

    • Main Results:

    • Semiconductor quantum dots (QDs) exhibit significantly higher brightness and photostability compared to organic dyes and fluorescent proteins.
    • QDs allow for the detection of individual nanoparticles over prolonged durations.
    • Conjugated QDs successfully tracked the motion of biomolecules at the single-particle level.

    Conclusions:

    • Semiconductor quantum dots (QDs) represent a powerful tool for advanced biological imaging.
    • Their superior photophysical properties enable long-term, high-resolution tracking of molecular dynamics.
    • QDs offer significant advantages for applications requiring sensitive and stable fluorescence detection.