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Upconversion for white light generation by a single compound.

Jiwei Wang1, Peter A Tanner

  • 1Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong S.A.R., PR China.

Journal of the American Chemical Society
|December 23, 2009
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel multiphoton upconversion process for rare earth oxide powders using infrared lasers. This method generates visible light emission, with thulium and ytterbium oxides achieving pure white upconversion.

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Area of Science:

  • Materials Science
  • Optics and Photonics
  • Solid State Physics

Background:

  • Rare earth oxide powders are crucial for optical applications.
  • Upconversion processes enhance material luminescence.
  • Controlling upconversion emission is key for advanced photonics.

Purpose of the Study:

  • To report a new multiphoton upconversion process for rare earth oxide powders.
  • To demonstrate visible spectral range emission via upconversion.
  • To achieve pure white upconversion using specific rare earth oxides.

Main Methods:

  • Utilizing infrared laser diodes for excitation.
  • Conducting experiments in a vacuum environment.
  • Employing thulium (Tm2O3) and ytterbium (Yb2O3) oxide powders.

Main Results:

  • Successful demonstration of multiphoton upconversion.
  • Intense upconversion emission observed in the visible spectral range.
  • Pure white upconversion achieved with Tm2O3 (808 nm excitation) and Yb2O3 (975 nm excitation).

Conclusions:

  • The reported multiphoton upconversion process is effective for rare earth oxides.
  • Infrared laser excitation can efficiently generate visible upconversion emission.
  • Specific rare earth oxides offer pathways to achieve white light emission.