Nonlinear absorption processes in triphenylamine-dithienothiophene- triphenylamine

Haeyoung Choi, Kwanghee Lee, Myoungsik Cha, Jong Hyup Lee, Kwang Sup Lee, Oh Kil Kim, Han Young Woo

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


We investigated the nonlinear absorption mechanism in the triphenylamlne-dithienothiophene-triphenylamine molecule by using laser pulses with two different pulse widths, 7 ns and 35 ps. The single-beam transmission measurement with a 7-ns pulse resulted in a larger nonlinear absorption than that with a 35-ps pulse and saturated at high input intensities due to the excited state absorption (ESA) initiated by two-photon absorption (TPA). For a quantitative characterization of the TPA and ESA contributions to the nonlinear absorption, we estimated the ESA spectrum and lifetime by using a pump-probe transmission measurement with a 35-ps pulse. A 5-level model was used to explain both the nonlinear absorption and the one-photon and the two-photon pumped fluorescence.

Original languageEnglish
Pages (from-to)887-891
Number of pages5
JournalJournal of the Korean Physical Society
Issue number4
Publication statusPublished - 2004 Oct
Externally publishedYes


  • Dithienothiophene
  • Excited-state absorption
  • Nonlinear absorption
  • Pump-probe experiment
  • Two-photon absorption

ASJC Scopus subject areas

  • General Physics and Astronomy


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