Ultrafast optical probes of excited states in halogen substituted PPV derivatives

H. S. Eom, S. C. Jeoung, Dongho Kim, J. I. Lee, H. K. Shim, C. M. Kim, C. S. Yoon

Research output: Contribution to journalArticle

Abstract

Photoexcitation dynamics of poly(1,4-phenylene vinylene) (PPV) and poly(2-fluoro-1,4-phenylene vinylene) (PFPV) were investigated. The femtosecond transient absorption spectra were recorded by using a high power femtosecond Ti:sapphire laser system. The laser pulses with 150 fs and 300 μ J/pulse at 800 nm were used to generate white light continuum for a probe beam, and the second harmonic generation at 400nm was employed as a pump beam. Transient absorption spectra and their decay profiles were measured by a dualdiode array detector and two photodiodes, respectively. We assign that photoinduced absorption(PA), which has ∼1 ps lifetime, arises from inter-chain polaron pairs. The decay of PA in PFPV was faster than that in PPV. This behavior is attributed to the large electronegativity of fluorine substituted at phenyl ring of PPV.

Original languageEnglish
Pages (from-to)515-516
Number of pages2
JournalSynthetic Metals
Volume84
Issue number1-3
Publication statusPublished - 1997 Jan 1

Fingerprint

Halogens
Excited states
halogens
Absorption spectra
Laser pulses
Derivatives
absorption spectra
Gene Conversion
Electronegativity
Fluorine
Aluminum Oxide
probes
Photoexcitation
decay
Harmonic generation
Photodiodes
pulses
photoexcitation
Sapphire
excitation

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Eom, H. S., Jeoung, S. C., Kim, D., Lee, J. I., Shim, H. K., Kim, C. M., & Yoon, C. S. (1997). Ultrafast optical probes of excited states in halogen substituted PPV derivatives. Synthetic Metals, 84(1-3), 515-516.
Eom, H. S. ; Jeoung, S. C. ; Kim, Dongho ; Lee, J. I. ; Shim, H. K. ; Kim, C. M. ; Yoon, C. S. / Ultrafast optical probes of excited states in halogen substituted PPV derivatives. In: Synthetic Metals. 1997 ; Vol. 84, No. 1-3. pp. 515-516.
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Eom, HS, Jeoung, SC, Kim, D, Lee, JI, Shim, HK, Kim, CM & Yoon, CS 1997, 'Ultrafast optical probes of excited states in halogen substituted PPV derivatives', Synthetic Metals, vol. 84, no. 1-3, pp. 515-516.

Ultrafast optical probes of excited states in halogen substituted PPV derivatives. / Eom, H. S.; Jeoung, S. C.; Kim, Dongho; Lee, J. I.; Shim, H. K.; Kim, C. M.; Yoon, C. S.

In: Synthetic Metals, Vol. 84, No. 1-3, 01.01.1997, p. 515-516.

Research output: Contribution to journalArticle

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AU - Eom, H. S.

AU - Jeoung, S. C.

AU - Kim, Dongho

AU - Lee, J. I.

AU - Shim, H. K.

AU - Kim, C. M.

AU - Yoon, C. S.

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AB - Photoexcitation dynamics of poly(1,4-phenylene vinylene) (PPV) and poly(2-fluoro-1,4-phenylene vinylene) (PFPV) were investigated. The femtosecond transient absorption spectra were recorded by using a high power femtosecond Ti:sapphire laser system. The laser pulses with 150 fs and 300 μ J/pulse at 800 nm were used to generate white light continuum for a probe beam, and the second harmonic generation at 400nm was employed as a pump beam. Transient absorption spectra and their decay profiles were measured by a dualdiode array detector and two photodiodes, respectively. We assign that photoinduced absorption(PA), which has ∼1 ps lifetime, arises from inter-chain polaron pairs. The decay of PA in PFPV was faster than that in PPV. This behavior is attributed to the large electronegativity of fluorine substituted at phenyl ring of PPV.

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Eom HS, Jeoung SC, Kim D, Lee JI, Shim HK, Kim CM et al. Ultrafast optical probes of excited states in halogen substituted PPV derivatives. Synthetic Metals. 1997 Jan 1;84(1-3):515-516.