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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.
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Related Experiment Video

Updated: Oct 24, 2025

Fabrication of Periodic Gold Nanocup Arrays Using Colloidal Lithography
08:21

Fabrication of Periodic Gold Nanocup Arrays Using Colloidal Lithography

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Light emission from plasmonic nanostructures.

Yi-Yu Cai1, Lawrence J Tauzin1, Behnaz Ostovar2

  • 1Department of Chemistry, Rice University, 6100 Main Street, Houston, Texas 77005, USA.

The Journal of Chemical Physics
|August 15, 2021
PubMed
Summary
This summary is machine-generated.

This study reveals that hot carriers, not Raman scattering, drive light emission in gold nanorods. Understanding this mechanism is key for applications like photocatalysis and nanothermometry.

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Last Updated: Oct 24, 2025

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Area of Science:

  • Nanophotonics and Plasmonics
  • Solid State Physics

Background:

  • The origin of light emission from metallic nanoparticles is debated, with photoluminescence and electronic Raman scattering as proposed mechanisms.
  • Plasmonic nanostructures exhibit unique optical properties due to their interaction with light.

Purpose of the Study:

  • To elucidate the light emission mechanism in gold nanorods.
  • To investigate the role of hot carriers in the emission process.
  • To establish a link between plasmonic properties and emission characteristics.

Main Methods:

  • Single gold nanorod spectroscopy using Stokes and anti-Stokes emission.
  • Continuous wave laser excitation with varying wavelength and power.
  • Analysis of particle size and crystallinity effects on emission lineshape and quantum yield.

Main Results:

  • Excitation parameters significantly alter hot carrier energy distribution and emission spectral lineshape.
  • Interband and intraband transitions influence the emission lineshape, dependent on particle size.
  • A direct correlation was found between single-particle emission quantum yield and plasmonic resonance quality factor.
  • Electron temperatures derived from anti-Stokes emission strongly support a hot carrier mechanism.

Conclusions:

  • The light emission from gold nanorods is primarily driven by a hot carrier photoluminescence mechanism, enhanced by the Purcell effect.
  • Understanding hot carrier dynamics is crucial for advancing fields such as photocatalysis and nanothermometry.