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.
Received: 05 November 2008
Revised: 16 December 2008
Accepted manuscript online:
Fund: Project supported by the National
Natural Science Foundation of China (Grant Nos 10804062 and
10874100), the Specialized Research Fund for the Doctoral Program of
Higher Education of China (Grant Nos 200804221005 and 20070422058),
and China Postdoctoral Science
Foundation funded project (Grant No 20080431171).
Cite this article:
Gao Kun(高琨), Xie Shi-Jie(解士杰), Li Yuan(李元), Yin Sun(尹笋), Liu De-Sheng(刘德胜), and Zhao Xian(赵显) Effect of interchain coupling on a biexciton in organic polymers 2009 Chin. Phys. B 18 2961
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