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Optical excitations in star-shaped fluorene molecules.

Neil A Montgomery1, Jean-Christophe Denis, Stefan Schumacher

  • 1Organic Semiconductor Centre, SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews, Fife, KY16 9SS, United Kingdom.

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Summary

Star-shaped molecules with oligofluorene arms exhibit enhanced optical properties like higher absorption and fluorescence compared to linear chains. Their emission originates from a single arm after excitation across the entire molecule.

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Photophysics

Background:

  • Star-shaped molecules offer unique electronic and photophysical properties due to their branched architecture.
  • Oligofluorenes are widely studied for their optoelectronic applications.

Purpose of the Study:

  • To investigate the low-energy optical transitions in two families of star-shaped molecules with oligofluorene arms.
  • To compare the photophysical properties of these star-shaped molecules with linear oligofluorenes.
  • To elucidate the relationship between molecular structure and optical behavior.

Main Methods:

  • Experimental spectroscopic measurements (absorption and fluorescence).
  • Time-dependent density functional theory (TD-DFT) calculations.
  • Comparison of star-shaped molecules (truxene and benzene cores) with linear oligofluorenes.

Main Results:

  • Star-shaped molecules demonstrated higher absorption and fluorescence dipoles and photoluminescence quantum yields than linear analogs.
  • TD-DFT revealed that absorption is delocalized over the entire molecule, while emission is localized to a single arm.
  • Both experimental and theoretical data showed an approximate n(0.5) dependence of transition dipole moments on the number of fluorene units (n).

Conclusions:

  • Star-shaped molecular architectures can significantly enhance photophysical properties compared to linear counterparts.
  • The distinct absorption and emission characteristics are attributed to the unique electronic structure of these star-shaped molecules.
  • The findings provide valuable insights for designing novel organic materials with tailored optical properties.