Low-temperature single-molecule spectroscopy of MEH-PPV conjugated polymer molecules

被引：84

作者：

Yu, Zhonghua ^{[1
,2
]}

Barbara, Paul F. ^{[1
]}

机构：

[1] Department of Chemistry, Ctr. Nano-/Molec. Sci./Technology, University of Texas, Austin

[2] Department of Chemistry, City College of New York, New York

来源：

Journal of Physical Chemistry B | 2004年 / 108卷 / 31期

关键词：

D O I：

10.1021/jp038005g

中图分类号：

学科分类号：

摘要：

Relatively narrow bandwidth fluorescence spectra were observed from isolated single molecules of the conjugated polymer, MEH-PPV (poly[2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylene vinylene]) at low temperature. The spectroscopy reveals rich spectral information in energy relaxation pathways and structure of this important electroluminescent material. From room temperature to 20 K the fluorescence of MEH-PPV molecules was found to red-shift by ∼20 nm along with a decreased electron-phonon coupling. The fluorescence spectra give clear evidence for efficient electronic energy funneling to a small number (one in some cases) of low-energy sites, each with an increased effective conjugation length compared to room temperature.

引用

页码：11321 / 11326

页数：5

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