Abstract
Exciton dynamics in π-conjugated molecular systems is highly susceptible to conformational disorder. Using time-resolved and single-molecule spectroscopic techniques, the effect of chain length on the exciton dynamics in a series of linear oligothiophenes, for which the conformational disorder increased with increasing chain length, was investigated. As a result, extraordinary features of the exciton dynamics in longer-chain oligothiophene were revealed. Ultrafast fluorescence depolarization processes were observed due to exciton self-trapping in longer and bent chains. Increase in exciton delocalization during dynamic planarization processes was also observed in the linear oligothiophenes via time-resolved fluorescence spectra but was restricted in L-10T because of its considerable conformational disorder. Exciton delocalization was also unexpectedly observed in a bent chain using single-molecule fluorescence spectroscopy. Such delocalization modulates the fluorescence spectral shape by attenuating the 0-0 peak intensity. Collectively, these results provide significant insights into the exciton dynamics in conjugated polymers.
| Original language | English |
|---|---|
| Pages (from-to) | 452-458 |
| Number of pages | 7 |
| Journal | Journal of Physical Chemistry Letters |
| Volume | 7 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 2016 Feb 4 |
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All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Physical and Theoretical Chemistry
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Chain-Length-Dependent Exciton Dynamics in Linear Oligothiophenes Probed Using Ensemble and Single-Molecule Spectroscopy. / Kim, Tae Woo; Kim, Woojae; Park, Kyu Hyung; Kim, Pyosang; Cho, Jae Won; Shimizu, Hideyuki; Iyoda, Masahiko; Kim, Dongho.
In: Journal of Physical Chemistry Letters, Vol. 7, No. 3, 04.02.2016, p. 452-458.Research output: Contribution to journal › Article
TY - JOUR
T1 - Chain-Length-Dependent Exciton Dynamics in Linear Oligothiophenes Probed Using Ensemble and Single-Molecule Spectroscopy
AU - Kim, Tae Woo
AU - Kim, Woojae
AU - Park, Kyu Hyung
AU - Kim, Pyosang
AU - Cho, Jae Won
AU - Shimizu, Hideyuki
AU - Iyoda, Masahiko
AU - Kim, Dongho
PY - 2016/2/4
Y1 - 2016/2/4
N2 - Exciton dynamics in π-conjugated molecular systems is highly susceptible to conformational disorder. Using time-resolved and single-molecule spectroscopic techniques, the effect of chain length on the exciton dynamics in a series of linear oligothiophenes, for which the conformational disorder increased with increasing chain length, was investigated. As a result, extraordinary features of the exciton dynamics in longer-chain oligothiophene were revealed. Ultrafast fluorescence depolarization processes were observed due to exciton self-trapping in longer and bent chains. Increase in exciton delocalization during dynamic planarization processes was also observed in the linear oligothiophenes via time-resolved fluorescence spectra but was restricted in L-10T because of its considerable conformational disorder. Exciton delocalization was also unexpectedly observed in a bent chain using single-molecule fluorescence spectroscopy. Such delocalization modulates the fluorescence spectral shape by attenuating the 0-0 peak intensity. Collectively, these results provide significant insights into the exciton dynamics in conjugated polymers.
AB - Exciton dynamics in π-conjugated molecular systems is highly susceptible to conformational disorder. Using time-resolved and single-molecule spectroscopic techniques, the effect of chain length on the exciton dynamics in a series of linear oligothiophenes, for which the conformational disorder increased with increasing chain length, was investigated. As a result, extraordinary features of the exciton dynamics in longer-chain oligothiophene were revealed. Ultrafast fluorescence depolarization processes were observed due to exciton self-trapping in longer and bent chains. Increase in exciton delocalization during dynamic planarization processes was also observed in the linear oligothiophenes via time-resolved fluorescence spectra but was restricted in L-10T because of its considerable conformational disorder. Exciton delocalization was also unexpectedly observed in a bent chain using single-molecule fluorescence spectroscopy. Such delocalization modulates the fluorescence spectral shape by attenuating the 0-0 peak intensity. Collectively, these results provide significant insights into the exciton dynamics in conjugated polymers.
UR - http://www.scopus.com/inward/record.url?scp=84957543246&partnerID=8YFLogxK
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U2 - 10.1021/acs.jpclett.5b02864
DO - 10.1021/acs.jpclett.5b02864
M3 - Article
AN - SCOPUS:84957543246
VL - 7
SP - 452
EP - 458
JO - Journal of Physical Chemistry Letters
JF - Journal of Physical Chemistry Letters
SN - 1948-7185
IS - 3
ER -