Effect of interchain coupling on a biexciton in organic polymers

Kun Gao*, Shi Jie Xie, Yuan Li, Sun Yin, De Sheng Liu, Xian Zhao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

The effect of interchain coupling on the formation and the stability of a biexciton is studied in poly (p-phenylene vinylene) chains in the framework of the tight-binding approach. We obtain an intrachain exciton and biexciton as well as an interchain exciton and biexciton through a double-photon excitation. It is found that a biexciton is energetically favourable to two single excitons even when there exists an interchain coupling. There is a turnover value t C of the interchain coupling for the formation of a biexciton, beyond which two excitons are combined into one biexciton. The binding energy of a biexciton is calculated to decrease with the increase of interchain coupling, which indicates that a biexciton is relatively stable in polymers with a weak interchain coupling. The conclusion is consistent with the experimental observations. In addition, a suggestion about how to improve the yielding efficiency or the formation of biexcitons in actual applications is given.

Original languageEnglish (US)
Pages (from-to)2961-2966
Number of pages6
JournalChinese Physics B
Volume18
Issue number7
DOIs
StatePublished - Aug 26 2009

Keywords

  • Biexciton
  • Binding energy
  • Polymers

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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