Investigation on relaxation dynamics of photoexcitations and spectral narrowing of photoluminescence in PPV films

Sac Chae Jeoung, Yong Hee Kim, Dongho Kim, Ja Young Han, Min Sik Jang, Hong Ku Shim

Research output: Contribution to journalConference article

3 Citations (Scopus)

Abstract

Photoinduced absorption spectral feature as well as their temporal profiles on PPV thin film in femtosecond time regime exhibit a strong pump power density dependence. The increase in pump power density also results in the spectrally narrowed emission (SNE) band superimposed to the well-known photoluminescence from PPV. The dependencies on both pump- and probe densities denote much lower saturation intensity in photoinduced absorption as compared with that in stimulated emission from the identical primary photoexcitations, the singlet excitons. We have also discussed the nature of SNE, which has a correlation with an appearance of ultrafast decay component (τ approx. 1 ps) in temporal decay profile of the photoinduced absorption signal.

Original languageEnglish
Pages (from-to)959-960
Number of pages2
JournalSynthetic Metals
Volume102
Issue number1-3
DOIs
Publication statusPublished - 1999 Jan 1
EventProceedings of the 1998 International Conference on Science and Technology of Synthetic Metals (ICSM-98) - Montpellier
Duration: 1998 Jul 121998 Jul 18

Fingerprint

Photoexcitation
photoexcitation
Photoluminescence
Pumps
pumps
photoluminescence
radiant flux density
Stimulated emission
decay
profiles
stimulated emission
Excitons
excitons
absorption spectra
saturation
Thin films
probes
thin films

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

Jeoung, Sac Chae ; Kim, Yong Hee ; Kim, Dongho ; Han, Ja Young ; Jang, Min Sik ; Shim, Hong Ku. / Investigation on relaxation dynamics of photoexcitations and spectral narrowing of photoluminescence in PPV films. In: Synthetic Metals. 1999 ; Vol. 102, No. 1-3. pp. 959-960.
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Investigation on relaxation dynamics of photoexcitations and spectral narrowing of photoluminescence in PPV films. / Jeoung, Sac Chae; Kim, Yong Hee; Kim, Dongho; Han, Ja Young; Jang, Min Sik; Shim, Hong Ku.

In: Synthetic Metals, Vol. 102, No. 1-3, 01.01.1999, p. 959-960.

Research output: Contribution to journalConference article

TY - JOUR

T1 - Investigation on relaxation dynamics of photoexcitations and spectral narrowing of photoluminescence in PPV films

AU - Jeoung, Sac Chae

AU - Kim, Yong Hee

AU - Kim, Dongho

AU - Han, Ja Young

AU - Jang, Min Sik

AU - Shim, Hong Ku

PY - 1999/1/1

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N2 - Photoinduced absorption spectral feature as well as their temporal profiles on PPV thin film in femtosecond time regime exhibit a strong pump power density dependence. The increase in pump power density also results in the spectrally narrowed emission (SNE) band superimposed to the well-known photoluminescence from PPV. The dependencies on both pump- and probe densities denote much lower saturation intensity in photoinduced absorption as compared with that in stimulated emission from the identical primary photoexcitations, the singlet excitons. We have also discussed the nature of SNE, which has a correlation with an appearance of ultrafast decay component (τ approx. 1 ps) in temporal decay profile of the photoinduced absorption signal.

AB - Photoinduced absorption spectral feature as well as their temporal profiles on PPV thin film in femtosecond time regime exhibit a strong pump power density dependence. The increase in pump power density also results in the spectrally narrowed emission (SNE) band superimposed to the well-known photoluminescence from PPV. The dependencies on both pump- and probe densities denote much lower saturation intensity in photoinduced absorption as compared with that in stimulated emission from the identical primary photoexcitations, the singlet excitons. We have also discussed the nature of SNE, which has a correlation with an appearance of ultrafast decay component (τ approx. 1 ps) in temporal decay profile of the photoinduced absorption signal.

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