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

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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