FABRICATION AND OPTICAL/ELECTRONIC PROPERTIES. OF INTERFACE-CONTROLLED ORGANIC NANO STRUCTURE

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依赖于薄膜中分子的取向。在本项目中，我们的目标是制备和表征取向控制的有机/无机和有机/有机杂化薄膜。对于平面分子，如喹吖啶酮(QD)化合物，QD分子外延生长在碱卤化物的解理表面上。QD薄膜的吸收性能与其分子取向有关。当QD分子平行于衬底表面取向时，分子间的电荷转移有效地促进了短波长区域的吸收强度。我们还研究了气相沉积在单轴取向的聚二甲基硅烷(PDMS)和聚二甲基硅烷(PPV)薄膜上的齐聚物如低聚二甲基硅烷(ODMS)和二苯基苯衍生物(聚对苯乙撑三聚体：PPV)的结构和光学性质。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。其吸收和发射强度的二色性比(I/IL)分别约为15和10。我们成功地制备了偏振发光低聚物薄膜作为一种新型的光子材料，另一方面，在薄膜中形成聚集体的情况下，非晶态薄膜具有很高的潜力。我们还发现，聚集体的-结构依赖于苯并噻唑环上引入的烷基链长。MD-2、-5和-6膜，这些数字表示烷基链中的碳原子数，来自H-聚集体，MD-10和无定形MD-18形成J-聚集体。这些薄膜具有很高的光存储潜力。

Organic thin films have high potential for next generation photoelectronic and photonic materials.Their physical properties heavily depend oh the molecular orientation in the film In this project, we aim to fabrication and characterization of orientation-controlled organic/inorganic and organic/organic hybrid films.In the case of planar molecules such as quinacridone(QD) compounds, QD molecules grew epitaxially on a cleaved surface of alkali halide. The absorption property of QD films was depended on the molecular orientation. When QD molecules oriented parallel to the substrate surface, the intermolecular charge transfer was contributed effectively to the absorption intensity in the short wavelength region. We also investigated the structure and optical properties of sigma- and pi-conjugated oligomers such as oligodimethylsilane (ODMS) and distyrylbenzane derivatives (trimer 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 (I// / IL) were about 15 and 10, respectively. We succeeded in preparation of polarized emitting oligomer films as novel photonic materials.In the case of the aggregate formation of merocyanine (MD) dyes in thin film., on the other hand, amorphous films had high potential. We also found that the - structure of,aggregate was depended on the alkyl chain lengths introduced at the benzothiazol ring. MD-2, -5 and -6 films, which the numbers indicate the number of carbon atoms in the alkyl chain, from H-aggregates, and MD-10 and amorphous MD-18 form J-aggregates. These films had high potential for optical memory.