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Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
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2D Thermal Maps Using Hyperspectral Scanning of Single Upconverting Microcrystals: Experimental Artifacts and Image

Allison R Pessoa1, Jefferson A O Galindo1, York E Serge-Correales2

  • 1Department of Physics, Universidade Federal de Pernambuco (UFPE), 50670-901 Recife-PE, Brazil.

ACS Applied Materials & Interfaces
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PubMed
Summary

Lanthanide-based upconverting particles show temperature variations based on laser position. Even minor environmental changes significantly impact measurements, affecting nanothermometry applications.

Keywords:
hyperspectral imagingluminescent thermometersmicroscopysingle-particle spectroscopyupconversion

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Spectroscopy

Background:

  • Lanthanide-based upconverting particles are vital for micro- and nanothermometry.
  • Understanding surface effects and internal dynamics is crucial but challenging.

Purpose of the Study:

  • To investigate spatially varying thermometric responses in single NaYF4:Yb3+,Er3+ microparticles.
  • To differentiate bulk from surface thermal effects using hyperspectral imaging.

Main Methods:

  • Hyperspectral sample-scanning experiments on single NaYF4: Yb3+,Er3+ microparticles.
  • Spatially resolved thermometric measurements were performed.

Main Results:

  • Thermometric response is dependent on laser excitation position.
  • Minor temperature fluctuations (<1 K) in the detection system significantly alter measurements.
  • Demonstrated the feasibility of creating 2D thermal maps.

Conclusions:

  • Laser incidence position influences temperature readings in upconverting particle nanothermometry.
  • Environmental and instrumental temperature stability is critical for accurate measurements.
  • Hyperspectral techniques offer a pathway to understand surface effects in nanothermometers.