On November 1, 2019, Professor Duan Yu was invited to participate in the academic exchange activities of the 110th anniversary of Lanzhou University. He also made an academic report entitled "Application of Atomic Layer Deposition in Flexible Optoelectronic Devices". He had an exchange with Peng Yong of the Electron Microscope Center of Lanzhou University and Professor Lan Wei of the School of Physics of Lanzhou University.
