Light-energy-conversion reaction system constracted by utilizing exciton dynamics.

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We have studied exciton dynamics of organic nanomaterials to realize efficient electron injection into semiconductor. We prepared aggregates, such as organic nanocrystals and dye molecule aggregate, on nanocrystalline TiO_2 films. Exciton dynamics of organic crystals, especially exciton fission process were studied by observing magnetic field effect of fluorescence. We found that electron injection from organic nanocrystals to TiO_2 occurs by means of transient absorption spectroscopy. Recombination process between an injected electron and a parent cation was also studied. Temperature dependence measurements were examined to characterize properties of electrons in TiO_2.