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Related Experiment Video

Updated: Jun 28, 2026

Compact Quantum Dots for Single-molecule Imaging
17:14

Compact Quantum Dots for Single-molecule Imaging

Published on: October 9, 2012

Caged quantum dots.

Gang Han1, Taleb Mokari, Caroline Ajo-Franklin

  • 1Biological Nanostructures Facility, The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.

Journal of the American Chemical Society
|November 6, 2008
PubMed
Summary
This summary is machine-generated.

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Researchers developed photoactivatable quantum dots (QDs) for advanced cellular imaging. These caged QDs offer enhanced brightness and photostability, improving spatial and temporal resolution in microscopy.

Area of Science:

  • Nanotechnology
  • Biophysics
  • Optical Microscopy

Background:

  • Photoactivatable probes, including organic fluorophores and fluorescent proteins, are vital for high-resolution cellular imaging.
  • Semiconducting nanocrystal quantum dots (QDs) exhibit superior brightness and photostability over traditional probes.
  • Existing photoactivatable probes have limitations in terms of brightness and photostability.

Purpose of the Study:

  • To synthesize and characterize novel photoactivatable probes using quantum dots.
  • To demonstrate the efficient quenching and UV-triggered activation of quantum dots.
  • To explore the potential of caged QDs for advanced cellular imaging applications.

Main Methods:

  • Synthesis of quantum dots (QDs) functionalized with ortho-nitrobenzyl groups for caging.

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Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots
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Last Updated: Jun 28, 2026

Compact Quantum Dots for Single-molecule Imaging
17:14

Compact Quantum Dots for Single-molecule Imaging

Published on: October 9, 2012

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

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots
15:47

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots

Published on: November 1, 2013

  • Photophysical characterization of caged QDs in solution and live cells.
  • Microscopy techniques to assess activation, imaging, and resolution enhancement.

    • Main Results:

    • Ortho-nitrobenzyl groups effectively quenched QD luminescence across various compositions and emission wavelengths.
    • UV light successfully released the caging groups, restoring QD luminescence in solution and live cells.
    • Caged QDs demonstrated photoactivatable properties, enabling enhanced spatial and temporal resolution in imaging.

    Conclusions:

    • Caged quantum dots represent a new class of photoactivatable probes with broad spectral applicability.
    • These probes combine the advantages of QDs (brightness, photostability) with photoactivatability.
    • Caged QDs offer significant potential for advancing superresolution microscopy and live-cell imaging.