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Single-Molecule Fluorescence Microscopy Reveals Energy Transfer Active versus Inactive Nanocrystal/Dye Conjugate

Danielle R Lustig1, Enes Buz2, Olivia F Bird3

  • 1Department of Chemistry, Colorado State University, 200 West Lake Street, Fort Collins, Colorado 80523-1872, United States.

Chemical & Biomedical Imaging
|September 2, 2025
PubMed
Summary

Defect-mediated energy transfer (EnT) in semiconductor nanocrystals (NCs) is impacted by sample heterogeneity. Single-particle studies reveal 20% of NC/dye pairs are inactive, affecting overall efficiency and informing future light-harvesting system design.

Keywords:
DefectsEnergy TransferFRETFluorescenceMicroscopySingle-MoleculeZnO

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photochemistry

Background:

  • Defect-mediated energy transfer (EnT) is crucial for light-harvesting systems.
  • EnT efficiency in semiconductor nanocrystals (NCs) depends on donor-acceptor distance, ratio, and orientation.
  • Ensemble measurements obscure heterogeneity and inactive pairs, limiting system optimization.

Purpose of the Study:

  • Investigate defect-mediated EnT at the single-particle level.
  • Quantify the impact of heterogeneity on EnT efficiency.
  • Understand the mechanisms behind EnT-inactive pairs.

Main Methods:

  • Single-molecule and single-NC fluorescence spectroscopy.
  • Studied AlexaFluor 555 dye acceptors on ZnO NC donors.
  • Numerical simulations of single-molecule photoluminescence (PL) traces.

Main Results:

  • 20% of bound NC/dye pairs were found to be EnT-inactive.
  • Single-particle studies revealed distinct microfluctuations in PL and fluorescence trajectories.
  • Simulations supported a competitive dye fluorescence quenching pathway, possibly via charge transfer.

Conclusions:

  • Sample heterogeneity significantly impacts EnT efficiency.
  • Inactive NC/dye pairs contribute to residual defect PL and reduced overall efficiency.
  • Findings provide insights for designing more efficient light-harvesting systems.