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Related Experiment Videos

Upconversion luminescence from CdSe nanoparticles.

Wei Chen1, Alan G Joly, David E McCready

  • 1Nomadics, Inc., 1024 South Innovation Way, Stillwater, Oklahoma 74074, USA. wchen@nomadics.com

The Journal of Chemical Physics
|June 25, 2005
PubMed
Summary
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This study reveals that trap states in cadmium selenide (CdSe) nanoparticles act as emitters, not intermediate states, enhancing upconversion luminescence. Efficient two-photon absorption is identified as the primary excitation mechanism in these nanomaterials.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Quantum Optics

Background:

  • Upconversion luminescence in nanomaterials is crucial for applications like bio-imaging and solar energy.
  • Understanding the roles of excitons and trap states in upconversion processes is essential for optimizing material performance.
  • Cadmium selenide (CdSe) nanoparticles are widely studied for their unique optical properties.

Purpose of the Study:

  • To investigate the mechanism of upconversion luminescence in CdSe nanoparticles.
  • To determine the role of trap states in the upconversion process.
  • To elucidate the excitation mechanism responsible for upconversion luminescence.

Main Methods:

  • Synthesis of CdSe nanoparticles with sizes ranging from 2.5 to 6 nm.

Related Experiment Videos

  • Measurement of upconversion luminescence and photoluminescence spectra.
  • Analysis of laser power dependence and decay lifetimes.
  • Temperature-dependent luminescence studies.
  • Time-resolved spectral measurements.

    • Main Results:

    • Efficient upconversion luminescence was observed in CdSe nanoparticles.
    • Upconversion luminescence showed a near-quadratic laser power dependence.
    • Emissions from both excitons and trap states were detected.
    • Trap state emission was enhanced in upconversion luminescence compared to photoluminescence.
    • Upconversion decay lifetimes were slightly longer than photoluminescence decay lifetimes.
    • Luminescence intensity decreased with increasing temperature due to thermal quenching.

    Conclusions:

    • Trap states function as emitters, not intermediate states, in the upconversion luminescence of CdSe nanoparticles.
    • Two-photon absorption is the likely excitation mechanism for upconversion luminescence.
    • Surface or trap states contribute to the longer decay components observed in upconversion luminescence.