Long-Lived Exciplex Formation and Delayed Exciton Emission in Bulk Heterojunction Blends of Silole Derivative and Polyfluorene Copolymer: The Role of Morphology on Exciplex Formation and Charge Separation

被引：38

作者：

Benson-Smith, Jessica J. ^{[1
]}

Wilson, Joanne ^{[1
]}

Dyer-Smith, Clare ^{[1
]}

Mouri, Kazuhiro ^{[2
]}

Yamaguchi, Shigehiro ^{[2
]}

Murata, Hideyuki ^{[3
]}

Nelson, Jenny ^{[1
]}

机构：

[1] Univ London Imperial Coll Sci Technol & Med, Dept Phys, London SW7 2BW, England

[2] Nagoya Univ Chikusa, Grad Sch Sci, Dept Chem, Nagoya, Aichi 4648602, Japan

[3] Japan Adv Inst Sci & Technol, Sch Mat Sci, Tokyo, Japan

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2009年 / 113卷 / 22期

关键词：

PHOTOVOLTAIC PERFORMANCE; PPV;

D O I：

10.1021/jp808671f

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Long-lived exciplex emission is observed in blend films of poly[9,9-dioctylfluorene-co-N-(4-methoxyphenyl)diphenylamine] (TFMO) and the soluble silole derivative 2,5-bis-(2,2-bipyridin-6-yl)-1,1-dimethyl-3,4-diphenylsilacyclopentadiene (PyPySPyPy). The exciplex is characterized by a long-lived (similar to 40-90 ns) component in both the photoluminescence and electroluminescence spectra, which is red-shifted relative to the emission of the pristine materials. In addition to exciplex emission, delayed fluorescence from the TFMO singlet state is observed and is attributed to exciton regeneration through the interfacial exciplex state. Comparing blend films made using chlorobenzene and p-xylene solvents, we find that exciplex lifetime and exciton regeneration in the blend film are sensitive to the choice of solvent and the resulting morphology of the blend film. The exciplex emissive lifetime can be correlated to changes in photoluminescence quenching and efficiency of light-emitting diodes.

引用

页码：7794 / 7799

页数：6

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