Resonant Raman characterization of polarons and bipolarons in alkali-metal-doped poly(p-phenyelenevinylene)

A. Sakamoto, Y. Furukawa, M. Tasumi

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The resonant Raman spectra of lightly sodium-doped and heavily potassium-doped poly(p-phenyelenevinylene)'s (PPV's) have been studied. These spectra have been analyzed on the basis of the resonant Raman spectra of the radical anions and dianions of three model compounds CH3(C6H4CH = CH)nC6H4CH3 (PVn, n = 1-3), which correspond, respectively, to negative polarons and bipolarons in PPV. The lightly sodium-doped PPV film contains a bipolaron which is localized in a region close to PV3, in addition to two kinds of polarons whose lengths are close to PV2 and PV3. The 1064-nm-excited resonant Raman spectrum of potassium-doped PPV is attributed to a bipolaron localized in a region close to PV3. The resonant Raman spectra of potassium-doped PPV excited at 514.5, 632.8 and 752.5 nm are explained by the existence of negative polarons. However, the bands in the 1271 - 1246 cm-1 range, which are observed for sodium-doped PPV and assigned to polarons, are not observed for potassium-doped PPV. The reason for their absence is discussed.

Original languageEnglish
Pages (from-to)593-598
Number of pages6
JournalSynthetic Metals
Volume55
Issue number1
DOIs
Publication statusPublished - 1993 Mar 15
Externally publishedYes

Keywords

  • Alkali metal doping
  • Bipolaron
  • Polaron
  • Resonant Raman spectroscopy
  • poly(p-phenyelenevinylene)

ASJC Scopus subject areas

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

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