Femtosecond dynamics of excitons in π-conjugated oligomers

The role of intrachain two-exciton states in the formation of interchain species

Victor I Klimov, Duncan W. McBranch, Nikolay N. Barashkov, John P. Ferraris

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

We report femtosecond transient absorption results for solutions and thin films of a substituted oligomer of poly(paraphenylene vinylene) performed over wide spectral and pump-intensity ranges. Solutions and films exhibit a photoinduced absorption (PA) band with dynamics matching those of the stimulated emission, demonstrating unambiguously that these features originate from intrachain singlet excitons. Thin films exhibit an additional short-wavelength PA band with pump-independent dynamics, indicating the formation of non-emissive interchain excitons. Correlations in the dynamics of the two PA features, as well as the intensity-dependence, provide strong evidence that the formation of interchain excitons is mediated by intrachain two-exciton states.

Original languageEnglish
Pages (from-to)109-117
Number of pages9
JournalChemical Physics Letters
Volume277
Issue number1-3
Publication statusPublished - Oct 3 1997

Fingerprint

oligomers
Oligomers
excitons
Absorption spectra
Pumps
pumps
absorption spectra
Thin films
Stimulated emission
thin films
stimulated emission
Wavelength
LDS 751
wavelengths

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Atomic and Molecular Physics, and Optics

Cite this

Femtosecond dynamics of excitons in π-conjugated oligomers : The role of intrachain two-exciton states in the formation of interchain species. / Klimov, Victor I; McBranch, Duncan W.; Barashkov, Nikolay N.; Ferraris, John P.

In: Chemical Physics Letters, Vol. 277, No. 1-3, 03.10.1997, p. 109-117.

Research output: Contribution to journalArticle

@article{438a5b63d15e45ed9ec22ff340a2f938,
title = "Femtosecond dynamics of excitons in π-conjugated oligomers: The role of intrachain two-exciton states in the formation of interchain species",
abstract = "We report femtosecond transient absorption results for solutions and thin films of a substituted oligomer of poly(paraphenylene vinylene) performed over wide spectral and pump-intensity ranges. Solutions and films exhibit a photoinduced absorption (PA) band with dynamics matching those of the stimulated emission, demonstrating unambiguously that these features originate from intrachain singlet excitons. Thin films exhibit an additional short-wavelength PA band with pump-independent dynamics, indicating the formation of non-emissive interchain excitons. Correlations in the dynamics of the two PA features, as well as the intensity-dependence, provide strong evidence that the formation of interchain excitons is mediated by intrachain two-exciton states.",
author = "Klimov, {Victor I} and McBranch, {Duncan W.} and Barashkov, {Nikolay N.} and Ferraris, {John P.}",
year = "1997",
month = "10",
day = "3",
language = "English",
volume = "277",
pages = "109--117",
journal = "Chemical Physics Letters",
issn = "0009-2614",
publisher = "Elsevier",
number = "1-3",

}

TY - JOUR

T1 - Femtosecond dynamics of excitons in π-conjugated oligomers

T2 - The role of intrachain two-exciton states in the formation of interchain species

AU - Klimov, Victor I

AU - McBranch, Duncan W.

AU - Barashkov, Nikolay N.

AU - Ferraris, John P.

PY - 1997/10/3

Y1 - 1997/10/3

N2 - We report femtosecond transient absorption results for solutions and thin films of a substituted oligomer of poly(paraphenylene vinylene) performed over wide spectral and pump-intensity ranges. Solutions and films exhibit a photoinduced absorption (PA) band with dynamics matching those of the stimulated emission, demonstrating unambiguously that these features originate from intrachain singlet excitons. Thin films exhibit an additional short-wavelength PA band with pump-independent dynamics, indicating the formation of non-emissive interchain excitons. Correlations in the dynamics of the two PA features, as well as the intensity-dependence, provide strong evidence that the formation of interchain excitons is mediated by intrachain two-exciton states.

AB - We report femtosecond transient absorption results for solutions and thin films of a substituted oligomer of poly(paraphenylene vinylene) performed over wide spectral and pump-intensity ranges. Solutions and films exhibit a photoinduced absorption (PA) band with dynamics matching those of the stimulated emission, demonstrating unambiguously that these features originate from intrachain singlet excitons. Thin films exhibit an additional short-wavelength PA band with pump-independent dynamics, indicating the formation of non-emissive interchain excitons. Correlations in the dynamics of the two PA features, as well as the intensity-dependence, provide strong evidence that the formation of interchain excitons is mediated by intrachain two-exciton states.

UR - http://www.scopus.com/inward/record.url?scp=0031551506&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0031551506&partnerID=8YFLogxK

M3 - Article

VL - 277

SP - 109

EP - 117

JO - Chemical Physics Letters

JF - Chemical Physics Letters

SN - 0009-2614

IS - 1-3

ER -