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Research on correlation among structure, reaction and function using photo, electric field and magnetic field as a perturbation

以光、电场、磁场为扰动研究结构、反应和功能之间的相关性

基本信息

批准号：
15205001
负责人：
OHTA Nobuhiro
金额：
$ 30.7万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

项目摘要

In this research project, picosecond time-resolved fluorescence and electrofluorescence spectrum measurement system has been constructed by combining ultrashort pulse laser, modulated electric field, and time-correlated fluorescence lifetime measurement apparatus. By combining ultrashort pulse laser, modulated electric field, and up-conversion fluorescence lifetime measurement method, femtosecond time-resolved fluorescence and electrofluorescence measurement system has been also constructed. These measurement systems have been applied to molecular systems composed of electron donor and acceptor which show photoinduced electron transfer or to molecular systems which show excimer formation following photoexcitation, and electric field effects on photoreaction dynamics have been examined. As a result, it was found that photoreaction is influenced by an electric field. For example, photoinduced electron transfer was found to be enhanced or de-enhanced by an electric field, depending on the … More donor-acceptor pair. By combining time-resolved experiments with steady-state measurements of electroabsorption and electrofluorescence spectra, a relation between the electric field effect on photoreaction and the electronic structure in the excited state has been examined. Theoretical analysis has been also made to elucidate the mechanism of electric field effects on photoreaction. A significant relation between the electric field effect on photoluminescence and the efficiency of electroluminescence has been also found in some aromatic compound. A synergy effect between electric field and magnetic field has been also found in photoinduced electron transfer system ; electric field effects on the rate of photoinduced electron transfer is significantly influenced by a magnetic field in some electron donor and acceptor pairs. A new apparatus for the measurements of photoirradiation effects on conductivity in the wide range of temperature has been constructed. With this apparatus, the resistance and its temperature dependence have been measured for α-(BEDT-TTF)_2I_3 both in the absence and in the presence of photoirradiation, and it was shown that a change from insulator to metal occurred by photoirradiation. Less

本研究将超短脉冲激光、调制电场和时间相关荧光寿命测量装置相结合，构建了皮秒时间分辨荧光和电致荧光光谱测量系统。结合超短脉冲激光、调制电场和上转换荧光寿命测量方法，构建了飞秒时间分辨荧光和电致荧光测量系统。这些测量系统已被应用到分子系统组成的电子供体和受体，显示光诱导的电子转移或分子系统，显示激基缔合物形成后的光激发，和电场对光反应动力学的影响进行了检查。结果，发现光反应受电场影响。例如，发现光诱导的电子转移通过电场增强或去增强，这取决于光诱导的电子转移。 ...更多信息供体-受体对通过结合时间分辨实验和稳态电吸收和电荧光光谱的测量，研究了电场对光反应的影响与激发态电子结构之间的关系。并从理论上分析了电场对光反应的影响机理。在某些芳香族化合物中还发现了电场对光致发光的影响与电致发光效率之间的显著关系。在光诱导电子转移体系中还发现了电场和磁场的协同效应，在某些电子给体和受体对中，电场对光诱导电子转移速率的影响明显受磁场的影响。建立了一种新的测量宽温区光辐照电导率的装置。用该装置测量了α-（BEDT-TTF）_2I_3在无光照射和有光照射时的电阻及其温度依赖性，结果表明，光照射使其发生了从绝缘体到金属的转变。少