10.1021/jz402450m.s001
Hajime Yamagata
Hajime
Yamagata
Frank C. Spano
Frank C.
Spano
Strong
Photophysical Similarities between Conjugated
Polymers and J‑aggregates
American Chemical Society
2015
radiative decay rates
exciton band curvature
radiative decay rate
excitonic band structure
vibronic signatures
systems share
gamma point
square root
Strong Photophysical Similarities
CP
Conjugated Polymers
photophysical resemblance
band gap semiconductors
2015-12-17 00:28:50
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Strong_Photophysical_Similarities_between_Conjugated_Polymers_and_J_aggregates/2028396
The photophysical properties of emissive
conjugated polymer (CP)
chains are compared to those of linear J-aggregates. The two systems
share many properties in common, including a red-shifted absorption
spectrum with increasing chain/aggregate length, enhanced radiative
decay rates (superradiance) relative to a single monomer/molecule,
and several vibronic signatures involving the vinyl-stretching mode
common to many conjugated molecules. In particular, the scaling of
the 0–0/0–1 photoluminescence ratio and radiative decay
rate with the inverse square root of temperature in red-phase polydiacetylene
is also characteristic of linear, disorder-free J-aggregates. The
strong photophysical resemblance is traced to the excitonic band structure;
in one-dimensional direct band gap semiconductors as well as J-aggregates,
the exciton band curvature is positive at the gamma point (<i>k</i> = 0).