Preparation of π-Conjugated Polymer Ultrathin Films and their Application to Organic Nanodevices

π共轭聚合物超薄膜的制备及其在有机纳米器件中的应用

• 批准号: 15550157
• 负责人: AOKI Atsushi
• 金额: $ 2.43万
• 依托单位: Nagoya Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15550157/
• 关键词: poly(3-hexylthiophene); Langmuir-Blodgett film; Organic Electroluminescent; Hole-Transporting Layer; π-Conjugated Polymer; π共役系高子; ラングミュア-プロジェット法; 両親媒性高分子; 有機ナノデバイス; π共役系高分子; ラングミュア-ブロジェット法

π-Conjugated polymers have received much attention for the application to electroluminescent devices, field-effect transistors and molecular electric devices because of their versatile electronic and photonic properties, structural flexibility and easy processability. These polymer films are generally formed by casting, dipping, spin-coating and ink-jet method. However, it is difficult to control film thickness at a molecular level and molecular orientation. It is necessary to control the thickness of ultrathin films for preparation of organic nano-devices. The Langmuir-Blodgett (LB) technique has attractive features to fabricate ultrathin films at a molecular level with molecular orientation and ordering. However, π-conjugated polymers have less ability to form monolayer on a water surface due to strong π-π interaction between aromatic main chains.To overcome the problem, we try to fabricate mixed LB films of π-conjugated polymer and an amphiphilic polymer. We have found that poly(N-d … More odecylacrylamide) (pDDA) has an ability to form a stable monolayer on the water surface and to fabricate an excellent LB film. In this study, the monolayer behavior of the mixtures of pDDA and poly(3-hexylthiophene) (PHT) or poly[2-[2',5'-bis[2''-ethylhexyloxyl]phenyl]-1,4-phenylene vinylenel (BEHP-PPV) on the water surface was investigated and conductivity of their mixed LB films was evaluated by conductivity measurement using interdigitated array (IDA) electrodes. We have found that π-conjugated polymers are well miscible with pDDA and the mixtures can form a stable monolayer on a water surface and LB film on substrates by the LB technique. The π-conjugated polymer ultrathin conducting film was fabricated by LB method using the mixture of pDDA and π-conjugated polymers. The conductivity of the mixed PHT LB film becomes 3 S/cm with doping, which is about three orders of magnitude higher than that of the undoping. It is expected to fabricate molecular electronic devices using the mixed LB films.Performance of the mixed PHT LB films on hole-injection for organic electroluminescent (EL) devices was also investigated. The matching of the energy potential between the work function of the ITO anode and HOMO energy level of the hole-injection materials is needed whereas the thickness of the hole-injection layer would not be needed as an ideal hole-injection layer. Onset voltage of EL devices using PHT LB films decreased with increasing number of layers due to reduction of energy barrier of hole injection from indium-tin-oxide (ITO) anode to PHT films. Quantum efficiency was improved at the monolayer PHT LB film EL devices. We demonstrated that the mixed PHT LB films could function as a hole-injection layer for EL devices. Less

π结合的聚合物因其多功能电子和光子性能，结构灵活性和易于加工而应用于电致电设备，现场效应变压器和分子电动器件，因此受到了极大的关注。这些聚合物膜通常是通过铸造，浸入，自旋涂层和喷墨方法形成的。但是，很难以分子水平和分子取向来控制膜厚度。有必要控制超薄膜的厚度，以制备有机纳米驱动器。 Langmuir-blodgett（LB）技术具有吸引人的特征，可在分子方向和顺序上以分子水平制造超薄膜。然而，由于芳族主链之间的强π-π相互作用，π共轭聚合物在水面上形成单层的能力较小。要克服该问题，我们试图制造π共轭聚合物和Aphiphilic聚合物的混合LB膜。我们发现Poly（N-D…更多的甲基丙烯酰胺）（PDDA）具有在水面上形成稳定的单层并制造出出色的LB膜的能力。在这项研究中，PDDA和聚（3-己基噻吩）的混合物的单层行为或Poly [2- [2'，5'，5'，5'-双[2'' - 乙基己基]苯基] -1,4-苯基苯基酚（Behp-PPPV）在水面上进行了综合性，并在水面上衡量了与电导率相关性的效率。阵列（IDA）电子。我们发现，π共轭聚合物与PDDA易于错过，并且混合物可以通过LB技术在水面上形成稳定的单层和LB膜。使用PDDA和π共轭聚合物的混合物通过LB方法制造π共轭聚合物超薄导电膜。混合PHT LB膜的电导率变成3 s/cm，掺杂倍数，比撤离高约三个数量级。预计还将研究使用混合LB膜来制造分子电子设备。还研究了混合PHT LB膜对有机电发光（EL）设备的孔注射的表现。需要在ITO阳极的工作函数和孔注射材料的HOMO能级之间的能量电位匹配，而作为理想的孔注射层，不需要孔注射层的厚度。使用PHT LB膜对EL设备的发作电压随着抑制抑制型氧化物氧化物（ITO）阳极对PHT膜的孔注射的能量屏障的减少而降低。单层PHT LB膜EL设备提高了量子效率。我们证明了混合的PHT LB膜可以用作EL设备的孔注射层。较少的

项目成果

A.Aoki, S.Yoshida, T.Saito, T.Miyashita: "Electronic/Photonic Properties of Mixed Langmuir-Blodgett Films with Poly(N-dodecylacrylamide) and π-Conjugated Polymers"Polymer Preprints. 44. 358-359 (2003)

A. Aoki、S. Yoshida、T. Saito、T. Miyashita：“混合 Langmuir-Blodgett 薄膜与聚（N-十二烷基丙烯酰胺）和 π-共轭聚合物的电子/光子特性”聚合物预印本 44. 358-359（2003 年） ）

正孔注入層およびそれを用いた有機電界発光(EL)素子

空穴注入层及使用其的有机电致发光(EL)器件

• 发表时间: 2005

Electronic/photonic Properties of Mixed Langmuir-Blodgett Films with Poly(N-dodecylacrylamide) and π-conjugated Polymers

聚（N-十二烷基丙烯酰胺）和 π 共轭聚合物混合 Langmuir-Blodgett 薄膜的电子/光子性质

• 发表时间: 2003
• 期刊: Polymer Preprints 44
• 作者: Atsushi Aoki;Atsushi Aoki
• 通讯作者: Atsushi Aoki

Application of Mixed Polymer Langmuir-Blodgett Films with Poly(3-hexylthiophene) to a Hole-injection Layer for Organic EL Devices

混合聚合物 Langmuir-Blodgett 薄膜与聚（3-己基噻吩）在有机 EL 器件空穴注入层中的应用

• 发表时间: 2005
• 期刊: Chemistry Letters 34
• 作者: Atsushi Aoki

Electronic/photonic Properties of Mixed Lagmuir-Blodgett Films with Poly(N-dodecylacrylamide) and π-conjugated Polymers

聚（N-十二烷基丙烯酰胺）和 π 共轭聚合物混合 Lagmuir-Blodgett 薄膜的电子/光子性质

• 发表时间: 2003
• 期刊: Polymer Reprint 44
• 作者: Atsushi Aoki;Atsushi Aoki;Atsushi Aoki
• 通讯作者: Atsushi Aoki