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Photoelectric properties of organic-polysilane quantum structures embedded in glassy matrices and their application to optical devices

嵌入玻璃基体中的有机聚硅烷量子结构的光电特性及其在光学器件中的应用

基本信息

批准号：
12450130
负责人：
NAITO Hiroyoshi
金额：
$ 10.3万
依托单位：
Osaka Prefecture University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

项目摘要

The main results obtained through this research are itemized below, (1) A route for synthesis of a block copolyiner [poly(methylphenylsilane-co-maethacryloxypropyltriethoxysilane), (MPS-co-MPTES)], which is essential for the fabrication of hybrid thin films, has been established. (2) Appropriate compositions of P(MPS-co-MPTES) in polysilane-silica hybrid thin films for the suppression of photoinduced degradation have been determined. (3) Time-resolved photoluminescence measurements have revealed that the exciton diffusion constants become lower with decreasing polysilane concentration. (4) Photoconduction in polysilane-titania hybrid thin films has been observed at room temperature. It has been found that photocurrent in polysilane-titania hybrid thin films is increased by about 1000 times in comparison with that in polysilane-silica hybrid thin films because of photo-induced charge transfer at polysilane/titania interface. Such photoconductive properties make it possible to apply these hybrid thin films to photoelectric devices such as photosensors and solar cells. (5) Photo-induced refractive index changes have been found in polysilane-inorganic glass hybrid thin films under intense ultra-violet (UV) light irradiation because of photochemical reaction of polysilane. These properties have not been found in polysilane thin films. The photoinduced change enables us to fabricate patternable optical waveguide. (6) Photoluminescence dichroism in polysilane-silica hybrid thin films induced by intense polarized UV light has been found. (7) Key devices for broad band optical communication such as grating waveguides and multilayer optical filters have been successfully fabricated. The gratings are easily prepared by holographic exposure of UV light and are applicable to liquid crystal alignment layers and distributed feedback lasers.

（1）建立了制备杂化薄膜所必需的嵌段共聚物[聚（甲基苯基硅烷-co-甲基丙烯酰氧基丙基三乙氧基硅烷）（MPS-co-MPTES）]的合成路线。(2)确定了用于抑制光致降解的聚硅烷-二氧化硅杂化薄膜中P（MPS-co-MPTES）的合适组成。(3)时间分辨的光致发光测量表明，激子扩散常数随着聚硅烷浓度的降低而降低。(4)在室温下观察到了聚硅烷-二氧化钛杂化薄膜的光电导。结果表明，由于聚硅烷/二氧化钛界面的光致电荷转移，聚硅烷/二氧化钛杂化薄膜的光电流比聚硅烷/二氧化硅杂化薄膜的光电流提高了约1000倍。这种光电导特性使得将这些杂化薄膜应用于光电器件如光传感器和太阳能电池成为可能。(5)由于聚硅烷的光化学反应，聚硅烷-无机玻璃混合薄膜在强紫外光照射下会发生光致折射率变化。这些性质在聚硅烷薄膜中还没有发现。光致变化使我们能够制作图案化的光波导。(6)发现了聚硅烷-二氧化硅杂化薄膜在强偏振紫外光作用下的光致发光二向色性。（7）成功制备了用于宽带光通信的光栅波导、多层滤光片等关键器件。该光栅易于通过紫外光全息曝光制备，并可应用于液晶取向层和分布反馈激光器。