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Excimer Emission in J-Aggregates.

Oleg P Dimitriev1, Yuri P Piryatinski2, Yuri L Slominskii3

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New excimers in J-aggregates, distinct from self-trapped excitons, form via intermolecular interactions. These excimers show delayed formation and temperature-dependent emission in cyanine dye solutions.

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Area of Science:

  • Photophysics
  • Materials Science
  • Chemical Physics

Background:

  • Excimers in J-aggregates are typically considered self-trapped excitons.
  • These arise from free excitons relaxing via vibronic interactions within the aggregate.

Purpose of the Study:

  • To investigate alternative excimer formation pathways in J-aggregates.
  • To characterize excimers formed through intermolecular off-diagonal interactions in thiamonomethinecyanine dyes.

Main Methods:

  • Spectroscopic analysis of thiamonomethinecyanine dye J-aggregates.
  • Temperature-dependent emission studies.
  • Concentration-dependent formation kinetics analysis.

Main Results:

  • Observed excimers with formation times exceeding 100 ps, indicating exciton migration.
  • Demonstrated excimer formation follows a power law with a concentration exponent of 1.5.
  • Found that lower temperatures significantly suppress excimer emission.

Conclusions:

  • Identified a new class of excimers in J-aggregates formed by intermolecular interactions.
  • Exciton migration and interaction with ground-state guest species are crucial for this excimer formation.
  • Temperature plays a critical role in the emission of these novel excimers.