Triplet exciton formation due to interaction between singlet excitons in polydiacetylene

K. Ichimura, M. Yoshizawa, H. Matsuda, S. Okada, M. M. Ohsugi, H. Nakanishi, T. Kobayashi

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16 Citations (Scopus)

Abstract

The time-resolved spectroscopy in polydiacetylene single crystals (PDA-MADF {poly-1-[3-(methylamino)phenyl]-4-[3,5-bis(trifluoromethyl)phenyl]-1,3- butadiyne}) on femtosecond and picosecond time scales was performed. The time dependence of the photoinduced reflectance change in PDA-MADF exhibits three components with lifetimes ∼200 fs, 1 - 2 ps, and ≫200 ps. These components are assigned to the free 1Bu excitons, self-trapped excitons, and triplet excitons. From the excitation intensity dependence of the reflectance change, a significant role of bimolecular interactions between singlet excitons for the formation of triplet excitons is clarified. A model of the mechanism of triplet exciton formation after the creation of singlet excitons is proposed.

Original languageEnglish
Pages (from-to)7404-7416
Number of pages13
JournalThe Journal of Chemical Physics
Volume99
Issue number10
DOIs
Publication statusPublished - 1993 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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