FABRICATION OF POLARIZED EMITTING DEVICES WITH INTERFACE-CONTROLLED CONJUGATED ORGANIC THIN FILMS

有机薄膜是一种极具潜力的新一代光电子和光子材料。它们的物理性质在很大程度上取决于薄膜中的分子取向。在本项目中，我们的目标是制备用于电子和光子器件的低维取向控制的有机薄膜。在单轴取向的聚二甲基硅烷(PDMS)和聚二甲基硅烷(PPV)薄膜上气相沉积低聚二甲基硅烷(ODMS)和二苯基苯衍生物(聚对苯乙炔的定时器：PPV)，并对其结构和光学性质进行表征。ODM和DSB在PDMS和PPV层上外延生长。ODMS/PDMS和DSBs/PPV双层膜的吸收和发射特性表现出明显的各向异性。吸收强度和发射强度的二色性比分别约为15和10。我们成功地制备了偏振发射低聚物薄膜作为新型的光子材料，并制备了单轴取向的并五苯薄膜。并五苯/聚四氟乙烯双层膜的电学性质也表现出各向异性。沿摩擦方向的场效应迁移率为4.2×10~(-1)cm~(-2)/vs。我们成功地制备了高性能的有机FET薄膜。用气相法制备了J-聚合体的花青膜。阐明了J-聚集体的取向结构和形成机理。此外，还以偶氮苯的朗缪尔-布洛杰特膜为基质制备了液晶盒。液晶取向的光化学调控依赖于偶氮苯的吸附结构。在紫外光和可见光照射下，电池的相对透过率发生了可逆的变化。这些薄膜具有很高的光学存储潜力。本项目的研究成果有望为利用有机化合物制造新型光电子器件和光子器件做出贡献

Organic thin films have high potential for next generation photoelectronic and photonic materials. Their physical properties heavily depend on the molecular orientation in the film. In this project, we aim to fabrication and characterization of low dimensional orientation-controlled organic thin films for electronic and photonic devices.The structure and optical properties of sigma-and pi-conjugated oligomers such as oligo-dimethylsilane (ODMS) and distyrylbenzene derivatives (timer of poly(p-phenylene vinylene) : PPV) vapor-deposited on uniaxially oriented polydimethylsilane (PDMS) and PPV films. ODMS and DSBs grew epitaxially on the PDMS and PPV layers. The ODMS/PDMS and DSBs/PPV double layers indicated the remarkable anisotropic feature in absorption and emission properties. The dichroic ratio of absorption and emission intensities were about 15 and 10, respectively. We succeeded in preparation of polarized emitting oligomer films as novel photonic materials.Uniaxially oriented pentacene films were also fabricated. The electrical property of pentacene/PTFE double layer also indicated anisotropic feature. The field effect mobility along to the traverse of the friction direction was 4.2x10^<-1>cm^2/Vs. We succeeded in preparation of high performance organic FET films.Thin film of J-aggregate of merocyanine (BTET) was prepared from vapor phase. Oriented structure and formation mechanism of J-aggregate were clarified. Moreover, liquid crystal (LC) cells were prepared by using Langmuir-Blodgett films of azobenzene as a substrate. Photochemical regulation of LC alignment depended on adsorption structure of azobenzene. The relative transmittance of the cell was changed reversibly by UV and visible light irradiation. These films had high potential for optical memory.Research results obtained in this project will be expected to contribute the fabrication of new photoelectronic and photonic devices with organic compounds