Chain-Length-Dependent Exciton Dynamics in Linear Oligothiophenes Probed Using Ensemble and Single-Molecule Spectroscopy

Tae Woo Kim, Woojae Kim, Kyu Hyung Park, Pyosang Kim, Jae Won Cho, Hideyuki Shimizu, Masahiko Iyoda, Dongho Kim

Research output: Contribution to journalArticle

7 Citations (Scopus)

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 languageEnglish
Pages (from-to)452-458
Number of pages7
JournalJournal of Physical Chemistry Letters
Volume7
Issue number3
DOIs
Publication statusPublished - 2016 Feb 4

Fingerprint

Chain length
Excitons
excitons
Spectroscopy
Molecules
spectroscopy
molecules
fluorescence
Fluorescence
disorders
Conjugated polymers
Depolarization
Fluorescence spectroscopy
LDS 751
depolarization
trapping
polymers

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physical and Theoretical Chemistry

Cite this

Kim, Tae Woo ; Kim, Woojae ; Park, Kyu Hyung ; Kim, Pyosang ; Cho, Jae Won ; Shimizu, Hideyuki ; Iyoda, Masahiko ; Kim, Dongho. / Chain-Length-Dependent Exciton Dynamics in Linear Oligothiophenes Probed Using Ensemble and Single-Molecule Spectroscopy. In: Journal of Physical Chemistry Letters. 2016 ; Vol. 7, No. 3. pp. 452-458.
@article{a08241adbec2446487b7f15983368497,
title = "Chain-Length-Dependent Exciton Dynamics in Linear Oligothiophenes Probed Using Ensemble and Single-Molecule Spectroscopy",
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.",
author = "Kim, {Tae Woo} and Woojae Kim and Park, {Kyu Hyung} and Pyosang Kim and Cho, {Jae Won} and Hideyuki Shimizu and Masahiko Iyoda and Dongho Kim",
year = "2016",
month = "2",
day = "4",
doi = "10.1021/acs.jpclett.5b02864",
language = "English",
volume = "7",
pages = "452--458",
journal = "Journal of Physical Chemistry Letters",
issn = "1948-7185",
publisher = "American Chemical Society",
number = "3",

}

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 journalArticle

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

UR - http://www.scopus.com/inward/citedby.url?scp=84957543246&partnerID=8YFLogxK

U2 - 10.1021/acs.jpclett.5b02864

DO - 10.1021/acs.jpclett.5b02864

M3 - Article

VL - 7

SP - 452

EP - 458

JO - Journal of Physical Chemistry Letters

JF - Journal of Physical Chemistry Letters

SN - 1948-7185

IS - 3

ER -