STU-GTIIT光学论坛（No.27）
报告地点：at Room 202 in the building of college of science, STU
报告时间：2024年10月28日 13:00
报告题目: Ultrafast Detection and Regulation of Excited States of Molecular Aggregated Photofunctional Materials
报 告 人：Ming-De Li(College of Chemistry and Chemical Engineer, Shantou University)
报告摘要:
Due to the interaction between molecules, the excited states relaxation process of the organic solid state is often different from the intrinsic relaxation process of the molecules in the solution phase. In order to reveal the excited state kinetic process of organic solids, the organic solid powder is most commonly used to explore its excited state relaxation process. However, organic solid powders have high optical density, multiple photons and strong scattering/refraction effects. Secondly, solid powder samples often have interfaces or defects that will interfere with the excited state relaxation process. Therefore, it is difficult to obtain and analyze the ultrafast spectral data when using organic solid powder to detect the excited state kinetic process, and the excited state kinetic process is very different from the actual research system. In addition, due to the lack of crystal structure, the energy levels of excited state, energy gap, molecular orbital and potenial energy surface of excited state for the solid powder cannot be accurately simulated. Up to now, the mechanism of the influence of the intermolecular interaction and crystal configuration on the excited state dynamics process of the organic molecular aggregated solid are still unclear, which seriously limits the design and application of organic photofunctional materials. To overcome these challenges, our research group established a single crystal or nanocrystalline research strategy, and used ultrafast spectroscopy to reveal the mechanism of intermolecular interaction (π-π, hydrogen bonds and so on), crystal configuration and electronic structure of donor- acceptor on the excited state dynamics of organic molecular aggregation solid, so as to regulate of the excited state dynamics process. These works provide theoretical guidance for the design of organic optical functional materials.
欢迎全校师生参加！
理学院
2024年10月25日
