Primary Processes in Photoconductivity Studied by Electromodulation Spectroscopy.

通过电调制光谱研究光电导的主要过程。

• 批准号: 09640695
• 负责人: KOTANI Masahiro
• 金额: $ 1.92万
• 依托单位: Gakushuin University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09640695/
• 关键词: Electromodulation Spectroscopy; Photoconductivity; Organic Photoconductors; Phthalocyanine; Fluorescence

A highly sensitive spectrophotometer has been developed, which has a resolution in absorbance as high as 10-5. It has proved to be a powerful research tool in determioning minute absorbance changes by, e. g. , an applied electric field. The electroabsorption spectrum of x-form H_2 Phthalocyanine has been investigated. The results indicate phtahlocyanines that exhibit a large electromodulation in their first absorption peak tend to have high efficiency of charge carrier generation.Also, modulation of fluorescence by an electric field has been studied. The results clearly show that the modulation is not due to an applied field, but due to charges injected from the electrodes. The anomalously sttong quenching due to injected charge seems to indicate that the lowest excited singlet state, which has a CT state character, disociates in the strong field surrounding the injected charges.As a whole, important participation of CT states in photocarrier generation, modulation of light absorption, and fluorescence, odulation, in the materials studied has been clarified.

研制了一种高灵敏度的分光光度计，其吸光度分辨率高达10-5。它已被证明是一种强大的研究工具，可以用来确定由外加电场引起的微小吸光度变化。研究了x-型H_2酞菁的电吸收光谱。结果表明，在第一个吸收峰表现出较大电调制度的邻位花青素往往具有较高的载流子产生效率。此外，还研究了电场对荧光的调制作用。结果清楚地表明，调制不是由于外加电场，而是由于电极注入的电荷。由注入电荷引起的异常强度猝灭似乎表明，具有CT态特征的最低激发态在注入电荷周围的强场中解离。总的来说，CT态在所研究的材料中参与了光载流子的产生、光吸收的调制和荧光的调制。

项目成果

M.Ono and M.Kotani: "Ionization of Molecular Excitons detected by Electron Emission;Coronene and α-Perylene." Chemical Physics Letters. (印刷中). (1998)

M.Ono 和 M.Kotani：“通过电子发射检测分子激子的电离；晕苯和 α-苝”（出版中）。

Kazuo Yamasaki: "Electrical and Related Properties of Organic Solids." Kluwer Academic Publishers, 450 (1997)

山崎一夫：“有机固体的电学和相关特性。”

Yoshiyuki Ono: "Charge Transfer States in x-form Metal-Free Phthalocyanine Crystal as Revealed by Electroabsorption." Molecular Crystals and Liquid Crystals. 印刷中. (1999)

Yoshiyuki Ono：“通过电吸收揭示的 x 型无金属酞菁晶体中的电荷转移状态”（1999 年出版）。

Rieko Kudo: "Effect of Electric Field on Fluorescence of Phtalocyanine Thin Films." Mol.Cryst.Liq.Cryst.315. 169-174 (1998)

Rieko Kudo：“电场对酞菁薄膜荧光的影响。”

Rieko Kudo: "Effect of Electric Field on Fluorescence of Phthalocyanine Thin Films." Molecular Crystals and Liquid Crystals. 315. 169-174 (1998)

Rieko Kudo：“电场对酞菁薄膜荧光的影响。”