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Related Concept Videos

Photoluminescence: Applications01:14

Photoluminescence: Applications

591
Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Photostable and Small YVO4:Yb,Er Upconversion Nanoparticles in Water.

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Researchers developed a simple silica coating for upconversion nanoparticles (UCNPs). These small, bright nanoparticles are ideal for deep tissue imaging and water-based biosensing applications.

Keywords:
bio-applicationbio-imagingsilica-coated UCNPsupconversion nanoparticles

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Biomedical Engineering

Background:

  • Upconversion nanoparticles (UCNPs) offer unique optical properties for biological applications.
  • Developing stable and bright UCNPs for in vivo use remains a challenge.

Purpose of the Study:

  • To develop a simple silica coating method for upconversion nanoparticles (UCNPs).
  • To enhance the crystallinity, stability, and luminescence of UCNPs for biological applications.

Main Methods:

  • Silica coating of vanadium oxide-based UCNPs.
  • High-temperature post-annealing of coated UCNPs.
  • Characterization of particle size, crystallinity, and luminescence properties.

Main Results:

  • Achieved well-crystalline UCNPs with small particle size and no agglomeration after high-temperature annealing.
  • Obtained bright visible emission when pumped with near-infrared light.
  • Demonstrated suitability for water-based biosensing applications.

Conclusions:

  • The developed silica coating method provides a simple route to highly crystalline and luminescent UCNPs.
  • These UCNPs are promising for advanced biological applications like deep tissue imaging and quantum sensing.
  • Vanadium oxide-based UCNPs with silica shells are a viable alternative to fluoride-based crystals for biosensing.