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Magnetic-Field-Switchable Laser via Optical Pumping of Rubrene.

Collin F Perkinson1, Markus Einzinger2, Joseph Finley2

  • 1Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA.

Advanced Materials (Deerfield Beach, Fla.)
|November 18, 2021
PubMed
Summary

Researchers developed a novel magnetic field sensor using singlet-fission materials. This sensor enables spatial imaging of magnetic fields and demonstrates a magnetically switchable laser with significant brightness modulation.

Keywords:
lasersmagnetic field imagingmagnetic sensorsoptical modulatorssinglet fissiontriplet-triplet annihilationupconversion

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Area of Science:

  • Materials Science
  • Optics
  • Condensed Matter Physics

Background:

  • Volumetric optical imaging of magnetic fields is difficult with current magneto-optical materials.
  • There is a need for dyes with strong magnetic interactions, distinct emission, and sample compatibility.

Purpose of the Study:

  • To explore singlet-exciton fission in rubrene for magnetic field sensing.
  • To demonstrate a magnetically switchable laser using doped rubrene.

Main Methods:

  • Exploiting the magnetic field effect on singlet-exciton fission in a rubrene thin film.
  • Doping rubrene with dibenzotetraphenylperiflanthene (DBP) to achieve optically pumped lasing.
  • Operating the laser near threshold and applying a 0.4 T magnetic field.

Main Results:

  • Demonstrated spatial imaging of magnetic fields using a rubrene thin film.
  • Achieved optically pumped, slab waveguide lasing in DBP-doped rubrene.
  • Observed magnetic-field-switchable lasing with a +360% intensity modulation at 0.4 T.

Conclusions:

  • Singlet-fission materials show promise for magnetic sensing applications.
  • This work presents the first magnetically switchable laser and the largest magnetic modulation in singlet-fission materials.
  • The findings could lead to new magneto-optical modulators.