Abstract
Exciton dynamics in organic semiconductors is a subject of great significance
from the standpoint of light emission, as well as light harvesting. As
transient excited state species, excimers are expected to play a significant
role in the dynamics and the fate of the excited state. Till recently, the
discourse on excimers in organic systems revolved around their role in
aggregation-induced fluorescence quenching, or utilizing their
characteristic red-shifted emission to report local interactions. But in the
last decade, research in the area of organic multichromophoric systems has
brought the spotlight back on this fascinating species. This review focuses
on recent developments that highlight the importance of excimers in various
processes involving multichromophoric systems, such as circularly polarized
emission, exciton migration, and singlet fission. The review also attempts
to address the question of whether excimers are useful or detrimental to
various photophysical and photochemical processes of importance.
Table of content:
Introduction
Excimers in Multichromophoric Assemblies
Excimer Luminescence
Excimers in Light Harvesting
Conclusions and Outlook
Key words
excimers - multichromophoric assembly - circularly polarized luminescence - exciton migration - singlet fission - symmetry-breaking charge separation