  Many optoelectronic devices based on organic materials require rapid and
long-range singlet exciton transport. Key factors that control the transport of
singlet excitons includes the electronic structure of the material, disorder
and exciton-phonon coupling. An important parameter whose influence on exciton
transport has not been explored is the symmetry of the singlet electronic state
(S1). Here, we employ femtosecond transient absorption spectroscopy and
microscopy to reveal the relationship between the symmetry of S1 and exciton
transport in highly aligned, near-disorder free, one-dimensional conjugated
polymers based on polydiacetylene.
