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Assessing Single Upconverting Nanoparticle Luminescence by Optical Tweezers.

P Rodríguez-Sevilla1, H Rodríguez-Rodríguez1, M Pedroni2

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|June 30, 2015
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Summary

We achieved stable trapping of single upconverting fluorescent nanoparticles (UCNPs) using optical trapping. Unexpectedly, single UCNP emission differs from nanoparticle assemblies due to radiation-trapping effects.

Keywords:
optical tweezerssingle particle fluorescenceupconverting nanoparticle

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Area of Science:

  • Nanotechnology
  • Optical Physics
  • Spectroscopy

Background:

  • Colloidal nanoparticles offer unique optical properties.
  • Upconverting fluorescent nanoparticles (UCNPs) are promising for various applications.
  • Controlling and understanding single nanoparticle behavior is crucial.

Purpose of the Study:

  • To achieve stable, long-term optical trapping of single UCNPs.
  • To investigate the optical emission characteristics of single UCNPs.
  • To understand the influence of trapping on UCNP emission.

Main Methods:

  • Optical trapping using a single infrared laser beam.
  • Spectroscopic analysis of single and assembled UCNPs.
  • Theoretical modeling to explain observed phenomena.

Main Results:

  • Stable, long-term immobilization of single Er(3+)/Yb(3+) codoped UCNPs was achieved.
  • Single UCNP emission spectra were found to differ from those of nanoparticle assemblies.
  • Radiation-trapping effects were identified as the cause of emission modulations.

Conclusions:

  • Optical trapping enables precise manipulation of single UCNPs.
  • Radiation-trapping significantly impacts single UCNP emission, contrary to previous assumptions.
  • This finding is relevant for applications utilizing UCNP luminescence.