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

为了实现电子有效注入半导体，我们研究了有机纳米材料的激子动力学。我们在纳米TiO_2薄膜上制备了有机纳米晶和染料分子聚集体。通过观察荧光的磁场效应，研究了有机晶体的激子动力学，特别是激子裂变过程。通过瞬态吸收光谱研究发现，有机纳米晶对TiO_2有电子注入。研究了注入电子与母体阳离子之间的相互作用过程。通过温度依赖性测量来表征TiO_2中电子的性质。

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.