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

本研究项目将超短脉冲激光、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荧光光谱测量系统。将超短脉冲激光、调制电场和上转换荧光寿命测量方法相结合，构建了飞秒时间分辨荧光和电致荧光测量系统。这些测量系统已应用于由电子给体和受体组成的光诱导电子转移的分子体系或光激发后形成准分子的分子体系，并考察了电场对光反应动力学的影响。结果发现，光反应受电场的影响。例如，根据…的不同，发现电场可以增强或减弱光致电子转移更多的供受者对。通过时间分辨实验与稳态电吸收光谱和电荧光光谱测量相结合，考察了电场对光反应的影响与激发态电子结构的关系。并对电场对光反应的影响机理进行了理论分析。在某些芳香族化合物中也发现了光致发光的电场效应与电致发光效率之间的显著关系。在光致电子转移体系中也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，电场对光致电子转移速率的影响很大。本文介绍了一种在较宽温度范围内测量光辐照对电导率影响的新装置。用该装置测量了α-(BEDT-TTf)_2I_3在无光照射和有光照射下的电阻及其与温度的关系，结果表明，光照射发生了绝缘体向金属的转变。较少

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