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Related Concept Videos

Photoluminescence: Applications01:14

Photoluminescence: Applications

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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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Photoluminescence: Fluorescence and Phosphorescence01:23

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Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...
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Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles
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Extraordinary Fluorescence Enhancement in Metal-Dielectric Core-Shell Nanoparticles.

Ilia L Rasskazov1, Alexander Moroz2, P Scott Carney1

  • 1The Institute of Optics, University of Rochester, Rochester, New York 14627, United States.

The Journal of Physical Chemistry Letters
|July 8, 2021
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Summary
This summary is machine-generated.

Thick dielectric coatings on metal-dielectric nanoparticles dramatically boost fluorescence. This enhancement, exceeding 3000x, is driven by unique multipole resonances in the dielectric shell.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Optics

Background:

  • Metal-dielectric core-shell nanoparticles are explored for optical applications.
  • Controlling fluorescence enhancement is crucial for sensing and imaging.

Purpose of the Study:

  • To investigate the impact of thick dielectric coatings on fluorescence enhancement in core-shell nanoparticles.
  • To identify the underlying mechanisms responsible for extreme fluorescence gains.

Main Methods:

  • Fabrication and characterization of gold@dielectric core-shell nanoparticles with varying dielectric shell thicknesses.
  • Numerical simulations to analyze electromagnetic field enhancements and resonance modes.
  • Experimental measurements of fluorescence enhancement factors for surface and interior emitters.

Main Results:

  • Unusually thick dielectric coatings achieved fluorescence enhancement factors (F̅) exceeding 3000.
  • This enhancement was observed for emitters on the nanoparticle surface and within the dielectric shell.
  • High-quality transverse electric (TE) multipole (l = 7) resonances were identified as the primary cause.

Conclusions:

  • Thick dielectric shells in core-shell nanoparticles enable unprecedented fluorescence enhancement.
  • TE multipole resonances are key to achieving these extraordinary optical properties.
  • These findings open new avenues for advanced fluorescent nanomaterials and applications.