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Upconversion Nanocomposite Materials With Designed Thermal Response for Optoelectronic Devices.

Eduardo D Martínez1, Carlos D S Brites2, Luís D Carlos2

  • 1"Gleb Wataghin" Institute of Physics (IFGW), University of Campinas (UNICAMP), Campinas, Brazil.

Frontiers in Chemistry
|March 20, 2019
PubMed
Summary

Researchers developed novel nanocomposite materials using upconversion nanoparticles (UCNPs) embedded in polymers. These materials enable easy processing into patterned thin films and luminescent inks for advanced optical devices.

Keywords:
electrochromic devicesluminescent coatingsoptical thermometryoptoelectronic devicespolymer nanocompositesthermochromismthermoplasmonicsupconversion nanoparticles

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Area of Science:

  • Non-linear optics
  • Materials science
  • Nanotechnology

Background:

  • Upconversion is a non-linear optical process where low-energy photons yield higher-energy emissions.
  • Upconversion nanoparticles (UCNPs) have diverse applications but face processing challenges for device integration.
  • Temperature significantly influences UCNP optical emissions, especially in nanoparticle form, offering sensing opportunities.

Purpose of the Study:

  • To develop easily processable nanocomposite materials based on UCNPs.
  • To explore the fabrication of thin films, patterned structures, and luminescent inks from these nanocomposites.
  • To leverage the size-dependent thermal properties of UCNPs for thermochromic optical devices.

Main Methods:

  • Dispersing UCNPs in polylactic acid or poly(methyl methacrylate) polymer matrices.
  • Processing nanocomposites into thin films and multilayers via solution-based methods.
  • Utilizing soft-lithography and ink dispensing for micro-scale patterning and feature creation.

Main Results:

  • Achieved highly homogeneous films with uniform UCNP distribution.
  • Demonstrated successful patterning of micro-scale features and luminescent tracks.
  • Showcased the potential for developing materials with high thermal sensitivity and thermochromic responses.
  • Observed local heating effects in designed nanostructures using the upconverting nanocomposites.

Conclusions:

  • Developed versatile nanocomposite materials for fabricating advanced optical devices.
  • Established effective methods for patterning and integrating UCNPs into functional structures.
  • Highlighted the potential of these materials for applications requiring thermal sensing and optical readouts.