Formation of a Defect-Free π-Electron System in Single β-Phase Polyfluorene Chains

被引：35

作者：

Da Como, Enrico ^{[1
]}

Borys, Nicholas J. ^{[1
]}

Strohriegl, Peter ^{[2
]}

Walter, Manfred J. ^{[1
]}

Lupton, John M. ^{[1
]}

机构：

[1] Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84112 USA

[2] Univ Bayreuth, D-95440 Bayreuth, Germany

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2011年 / 133卷 / 11期

关键词：

CONJUGATED POLYMERS; CHEMICAL DEFECTS; SPECTROSCOPY; CHROMOPHORES; DYNAMICS;

D O I：

10.1021/ja109342t

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Single-molecule spectroscopy can help to uncover the underlying heterogeneity of conjugated polymers used in organic electronics, revealing the most effective molecules in an ensemble in terms of the transport of charge and excitation energy. We demonstrate that beta-phase polyfluorene chains can form a near-perfect pi-electron system, whereas conventional polymers exhibit chromophoric localization due to perturbation of the conjugation. Broad-band excitation spectroscopy demonstrates that only one absorbing and emitting unit is present on the polymer chain with an average length of similar to 500 repeat units, illustrating that the material effectively behaves as a molecular quantum wire with strong electronic coupling throughout the entire system.

引用

页码：3690 / 3692

页数：3

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