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Related Concept Videos

Photoluminescence: Applications01:14

Photoluminescence: Applications

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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An Integrated System to Remotely Trigger Intracellular Signal Transduction by Upconversion Nanoparticle-mediated Kinase Photoactivation
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YAG:Ce nanoparticle lightsources.

B Masenelli1, O Mollet, O Boisron

  • 1Institut des Nanotechnologies de Lyon, UMR 5270 CNRS and INSA Lyon, 7 avenue Jean Capelle, Université de Lyon F-69621 Villeurbanne Cedex, France. bruno.masenelli@insa-lyon.fr

Nanotechnology
|March 29, 2013
PubMed
Summary
This summary is machine-generated.

We studied cerium-doped yttrium aluminum garnet (YAG) nanoparticles for microscopy. The 4% doping level showed optimal luminescence, with defects impacting lower and higher concentrations.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optical Physics

Background:

  • Yttrium aluminum garnet (YAG) nanoparticles are promising for optical applications.
  • Cerium (Ce) doping influences YAG luminescence properties.
  • Nanoparticles for scanning near-field optical microscopy require specific fabrication and characterization.

Purpose of the Study:

  • To investigate the luminescence properties of Ce-doped YAG nanoparticles.
  • To correlate doping concentration and structural defects with optical emission.
  • To assess the suitability of these nanoparticles as probes for scanning near-field optical microscopy.

Main Methods:

  • Fabrication of 10 nm YAG nanoparticles doped with Ce at 0.2%, 4%, and 13% using a physical method.
  • Structural analysis (amorphous nature, compositional defects) via elemental analysis.
  • Optical characterization using cathodoluminescence and time-resolved photoluminescence.
  • Elemental distribution analysis using Rutherford backscattering spectrometry.

Main Results:

  • Amorphous structure and compositional defects were observed in the synthesized nanoparticles.
  • Optimal luminescence emission was achieved at a 4% Ce doping level.
  • High Ce doping (13%) led to minimal luminescence due to Ce(4+) formation and inefficient incorporation.
  • Luminescence enhancement was disproportionately higher than the increase in Ce concentration.
  • Quenching centers related to crystalline disorder and two Ce ion populations were identified.
  • Nano-cathodoluminescence confirmed homogeneous distribution of Ce ions and defects.

Conclusions:

  • The luminescence yield of Ce-doped YAG nanoparticles is critically dependent on doping concentration and structural integrity.
  • A 4% Ce doping level offers the best luminescence performance for these amorphous nanoparticles.
  • The findings provide insights into defect engineering for optimizing nanoparticle-based optical probes.