Nanoscale Ordered Structure Distribution in Thin Solid Film of Conjugated Polymers: Its Significance in Charge Transport Across the Film and in Performance of Electroluminescent Device

被引：22

作者：

Chen, Ming-Chih ^{[1
]}

Hung, Wei-Chun ^{[1
]}

Su, An-Chung ^{[1
]}

Chen, Su-Hua ^{[2
]}

Chen, Show-An ^{[1
]}

机构：

[1] Natl Tsing Hua Univ, Dept Chem Engn, Hsinchu 30013, Taiwan

[2] Natl Dong Hwa Univ, Dept Mat Sci & Engn, Hualien 974, Taiwan

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2009年 / 113卷 / 32期

关键词：

LIGHT-EMITTING-DIODES; SCANNING OPTICAL MICROSCOPY; INDIUM TIN OXIDE; INTERCHAIN INTERACTIONS; ENERGY-TRANSFER; MORPHOLOGY; FIELD; AGGREGATION; EMISSION; MOBILITY;

D O I：

10.1021/jp901644m

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：

We use ultrahigh-vacuum conducting atomic force microscopy to probe the local current distributions in spin-cast thin films from the solutions of poly(2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene) (MEH-PPV) and poly(9,9-di-n-octyl-2,7-fluorene) (PFO). We found that spatially homogeneous distribution of the ordered structures (well-packed chains and/or aggregates) in MEH-PPV can be controlled by the selection of solvent or mixed solvent, by which effects of spatial charge transport distribution in MEH-PPV thin films on the performance of polymer light-emitting diodes (PLEDs) are unambiguously clarified. For PFO thin film, after the treatment by immersing in the mixed nonsolvent composed of a solvent and nonsolvent, the ordered structures (beta-phase) are generated; its excess content can result in highly conducting regions. However, the device efficiency can be promoted significantly by optimizing the content of beta-phase.

引用

页码：11124 / 11133

页数：10

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