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Related Experiment Video

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Quantitatively Measuring In situ Flows using a Self-Contained Underwater Velocimetry Apparatus SCUVA
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Broad-range flow velocimetry enabled by pulse-width-dependent luminescence of core-multishell upconversion

Hai Huang1, Ankang Wan1, Zijian Geng1

  • 1School of Materials Science and Engineering, Xiamen University of Technology, Fujian Provincial Key Laboratory of Functional Materials and Applications, Xiamen, 361024, China. anxie@xmut.edu.cn.

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Lanthanide-doped upconversion nanoparticles (UCNPs) offer new possibilities for flow velocimetry. A core-multishell UCNP probe with dual emissions allows for precise, broad-range fluid velocity calibration via optical modulation.

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Area of Science:

  • Nanotechnology
  • Optical Sensing
  • Materials Science

Background:

  • Lanthanide-doped upconversion nanoparticles (UCNPs) possess unique optical properties valuable for sensing.
  • UCNP-based probes are promising for microfluidic flow velocity calibration.
  • Developing UCNPs with efficient luminescence modulation for wide-range flow velocimetry is challenging.

Purpose of the Study:

  • To engineer a core-multishell UCNP probe for advanced flow velocimetry.
  • To achieve real-time dynamic optical modulation using dual emissions.
  • To establish a quantitative emission ratio-velocity mapping for precise calibration.

Main Methods:

  • Fabrication of a core-multishell UCNP probe: NaGdF4:Tm3+/Yb3+@NaGdF4@NaGdF4:Eu3+@NaYF4.
  • Utilizing spatially isolated Tm3+ (blue) and Eu3+ (red) activators for dual emissions.
  • Correlating the intensity ratio of dual emissions with laser pulse width for optical modulation.

Main Results:

  • The engineered UCNP probe demonstrated laser pulse-width-dependent dual emission intensity ratios.
  • A quantitative relationship between fluid velocity and emission ratio was established.
  • The method enabled precise calibration and significantly broadened the measurable velocity range.

Conclusions:

  • The developed core-multishell UCNP probe enables precise, broad-range flow velocimetry through optical modulation.
  • This sensing paradigm advances fluid velocimetry and highlights the versatility of UCNPs in photonic technologies.