Our group's research goals are to discover new quantum dots and to explore their unexpected new properties. To achieve these goals, we will develop new synthesis methods and use ultrafast time-resolved spectroscopy to understand their fundamental photophysical properties. Quantum dot is discovered in the early 1980s by two scientists independently and revolutionaized the methods later, making their quality extremely high. When its size shrinks to nano-dimensions, quantum phenomena arise that has not been observed in its bulk material. The electrons in these nanomaterials are squeezed together, resulting in discrete energy states and increase its bandgap via size-dependent quantum effect. The new phenomena work as one milestone for the whole field of nanoscience and nanotechnology. Until now, the study on quantum dots have been mainly focused on the 0-dimensional nanomaterials based on CdSe, InP, PbSe and so on. Recently, perovskite quantum dot, a new nanomaterial with different crystal structures and compositions, has been discovered and received great attention because it can give a new possibility in nanotechnology. Our group wants to move one-step further and as a first step to discover new nanomaterials. We will develop new quantum dot systems with various chemical compositions, such as transition metal dichalcogenide, and study their new physical and chemical properties. We are especially interested in light-matter interactions in the nanomaterials, that is the excited state dynamics of carriers in nanomaterials to understand its fundamental photophysical properties. Then, we will study spin manipulation with photon in nanomaterials to induce magnetization on quantum dots and to guide photochemical reactions on the surface of quantum dots.