Resonance Raman and ultraviolet to infrared absorption studies of positive polarons and bipolarons in sulfuric-acid-treated poly(p-phenylenevinylene)

Akira Sakamoto, Yukio Furukawa, Mitsuo Tasumi

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The resonance Raman and infrared spectra of sulfuric-acid-treated poly(p-phenylenevinylene) (PPV) have been observed and analyzed on the basis of the resonance Raman spectra of the radical-cation and dication species of the model compounds CH3(C6H4CH=CH)nC6H 4CH3 (PVn, n = 1-3), which correspond, respectively, to positive polarons and bipolarons in PPV. Sulfuric-acid-treated PPV is considered to contain a considerable amount of positive polarons having a more or less uniform length and a relatively small amount of positive bipolarons. Of the two electronic absorption bands at 2.25 and 1.00 eV of sulfuric-acid-treated PPV, the former absorption band is due to the positive polarons, whereas the latter has overlapping components arising from the positive polarons and bipolarons. It is suggested that the high electrical conductivity of sulfuric-acid-treated PPV may be due to formation of a polaron lattice, a regular array of polarons.

Original languageEnglish
Pages (from-to)4635-4640
Number of pages6
JournalJournal of physical chemistry
Issue number17
Publication statusPublished - 1994 Jan 1


ASJC Scopus subject areas

  • Engineering(all)
  • Physical and Theoretical Chemistry

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