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Area of Science:

  • Nanotechnology
  • Photophysics
  • Biomedical Engineering

Background:

  • Semiconductor quantum dots (QDs) are highly versatile fluorophores for Förster resonance energy transfer (FRET).
  • Multidonor-multiacceptor FRET networks on QDs are crucial for advanced fluorescence sensing and imaging.
  • A comprehensive understanding of these complex FRET systems is still developing.

Purpose of the Study:

  • To provide a holistic photophysical analysis of multidonor-QD-multiacceptor FRET systems.
  • To investigate the FRET pathways involving terbium complex (Tb) donors and Cy5.5 dye acceptors attached to QDs.
  • To explore the application of these systems in optical barcoding and fluorescence microscopy.

Main Methods:

  • Utilized time-resolved and steady-state photoluminescence (PL) spectroscopy.
  • Employed Monte Carlo simulations for comprehensive analysis.
  • Investigated FRET pathways by analyzing Tb, QD, and Cy5.5 PL signals.

Main Results:

  • Experimental and simulation results showed excellent agreement.
  • Successfully disentangled contributions from hetero-FRET, homo-FRET, and dye dimerization.
  • Demonstrated independent tuning of PL intensity (via Tb donors) and PL lifetime (via Cy5.5 acceptors).

Conclusions:

  • Developed brightness-equalized Tb-QD-Cy5.5 conjugates with tunable optical properties.
  • Applied these conjugates for optical barcoding using RGB ratios for microbead distinction.
  • Showcased direct applicability in standard fluorescence microscopy with single-wavelength excitation and detection.