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

有机薄膜是下一代光电子和光子材料的重要组成部分，其物理性质与薄膜中分子的取向密切相关。本项目的目标是制备和表征取向可控的有机/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分子在碱金属卤化物的解理表面上外延生长。量子点薄膜的吸收特性与分子取向有关。当量子点分子取向与衬底表面平行时，分子间的电荷转移对短波长区的吸收强度有很好的贡献。我们还研究了结构和光学性能的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（对苯撑乙烯）的三聚体：PPV）气相沉积在单轴取向的聚二甲基硅烷（PDMS）和PPV薄膜。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（I/IL）分别约为15和10。我们成功地制备了偏振发光的低聚物薄膜作为新型的光子材料。在汞（MD）染料在薄膜中聚集形成的情况下，另一方面，非晶膜具有高电势。我们还发现，聚集体的结构依赖于在苯并噻唑环上引入的烷基链的长度。MD-2、MD-5和MD-6膜（其数字表示烷基链中的碳原子数）形成H-聚集体，而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.