On May 31, 2023, the Photonic Nose and Molecular Materials Group invited researcher Wu Kaifeng from Dalian Institute of Chemical Physics, Chinese Academy of Sciences, to give a report titled Quantum Dot Ultrafast Spin Optophysics and Photochemistry to group members in the Lecture Hall of the Institute of New Concept Sensors and Molecular Materials building. The report was hosted by Prof. Bian Hongtao, and attended by group teachers, doctoral and master’s students.

The main research area of Wu is the excitons, charge carriers, and spin ultrafast dynamics of low-dimensional optoelectronic materials such as quantum dots, as well as their applications in new energy and quantum technology. In the presentation, Wu discussed some of the recent research work conducted by his team. They employed advanced time-resolved spectroscopy methods to systematically investigate the ultrafast photophysics and photochemical mechanisms of quantum dots. They developed femtosecond transient magneto-optical techniques to study spin dynamics. Long-lived hot electron populations and novel quantum confinement effects were observed in impurity and electron-doped quantum dots. They also studied the triplet energy transfer mechanism between quantum dots and organic molecules, and based on this, developed highly efficient photon upconversion systems. By combining it with organic photocatalysis, they achieved rapid and efficient solar fuel synthesis.

After the report, Wu discussed the relevant content of the report with the students and teachers present, cleared their doubts, and took a photo with the participating teachers.