Studies on the structure of the interface between a metal and an organic thin film and voltage-induced processes by using infrared reflection-absorption spectroscopy

利用红外反射吸收光谱研究金属与有机薄膜之间的界面结构和电压诱导过程

基本信息

批准号：
11440179
负责人：
FURUKAWA Yukio
金额：
$ 6.85万
依托单位：
Waseda University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

项目摘要

We have developed an infrared reflection-absorption spectroscopic method with a 45 degree incident angle in order to study organic light-emitting diodes and organic metal-insulator-semiconductor diodes. These devices have multilayer structures consisting of a metal electrode, an indium-tin-oxide (ITO) electrode, and organic compounds. In the infrared reflection-absorption spectra of organic light-emitting diodes, infrared bands are strongly observed with the p-polarization and weakly observed with the s-polarization. These results have been explained as follows. For the p-polarization, the intensity of the standing wave produced by the interference of the incident and reflected beams is strong in the direction of the surface normal at the metal surface. On the other hand, for the s-polarization, the resulting standing wave is extremely weak at the metal surface. The orientations of polymer chains have been determined by measuring the reflection-absorption and transmission-absorption spectra of polymer thin films. The voltage-induced infrared absorption spectra of polymer light-emitting diodes and polymer metal-insulator-semiconductor diodes have been measured by using the FT-IR difference spectrum method. The observed spectra have been attributed to injected carriers (polarons). The injected carrier balance of polymer light-emitting diodes have been discussed on the basis of the observed results. It has been demonstrated that infrared reflection-absorption spectroscopy is a powerful tool for studying the structures and orientation of organic compounds and injected carriers in organic electronic devices.

我们已经开发了一种具有45度入射角的红外反射 - 吸收光谱法，以研究有机发光二极管和有机金属绝缘子 - 官方二极管二极管。这些设备的多层结构由金属电极，二键蛋白氧化物（ITO）电极和有机化合物组成。在有机发光二极管的红外反射吸收光谱中，强烈观察到红外线的p极化，并在S偏振下观察到弱观察到。这些结果已解释为如下。对于p极化，入射和反射梁的干扰产生的驻波的强度在金属表面在表面正常的方向上很强。另一方面，对于S偏振，在金属表面上产生的驻波极为弱。聚合物链的方向已通过测量聚合物薄膜的反射吸收和吸收光谱来确定。通过使用FT-IR差异光谱法测量了电压发光二极管和聚合物金属 - 胰蛋白胰蛋白胰蛋白二极管二极管二极管二极管二极管二极管的红外吸收光谱。观察到的光谱已归因于注入的载体（极性）。在观察到的结果的基础上，已经讨论了聚合物发光二极管的注射载体平衡。已经证明，红外反射吸收光谱是研究有机化合物中有机化合物和注入载体的结构和方向的强大工具。