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

有机薄膜是下一代光电子和光子材料的重要组成部分。它们的物理性质在很大程度上取决于膜中的分子取向。在本项目中，我们的目标是制备和表征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PPV薄膜上气相沉积σ-和π-共轭低聚物如低聚二甲基硅烷（ODMS）和二苯乙烯基苯衍生物（聚对苯乙炔的三聚体：PPV）的结构和光学性质。ODMS和DSB在PDMS和PPV层上外延生长。ODMS/PDMS和DSB/PPV双层膜显示出明显的各向异性特征。吸收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光的寡聚物薄膜作为新型的光子材料，还制备了单轴取向的并五苯薄膜。并五苯/PTFE双层膜的电性能也呈现各向异性特征。沿摩擦方向横向的场效应迁移率沿着达到4.2 × 10 ~（<-1>-1）cm ~ 2/Vs。阐明了J-聚集体的取向结构和形成机理。此外，液晶（LC）电池，通过使用LB膜的偶氮苯作为基板制备。液晶取向的光化学调控依赖于偶氮苯的吸附结构。通过紫外光和可见光照射，电池的相对透射率可逆地改变。这些薄膜在光存储方面具有很大的潜力，本项目的研究成果有望为利用有机化合物制备新型光电子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