报告题目：Visualizing Near Infrared Light
报告时间：10:00 AM, October 24th (Wednesday)
Near infrared (NIR) to visible light up-conversion is of significant importance in many applications including thermal imaging, bio-imaging, night vision and wellness monitoring. This talk will discuss the development of a high performing NIR to saturated green light up-conversion device, comprising a front solution processable organic bulk heterojunction NIR charge generation layer (CGL) and an upper CsPbBr3 perovskite light-emitting diode (PeLED) unit. The NIR CGL, based on a blend of the NIR sensitive donor polymer and a nonfullerene acceptor, enables an efficient hole injection in the CsPbBr3 PeLED in the presence of NIR light and also serves as an optical out-coupling layer to enhance the visible light emission by the CsPbBr3 PeLED. The CsPbBr3 PeLED has a narrow emission spectrum with a peak wavelength of 520 nm, corresponding to the wavelengths near the peak response of the human eye, and has the advantage in imaging applications. Based on the up-conversion process, a pixel-less NIR to visible light imaging device was demonstrated, which can be operated at a low voltage of 3 V. The NIR to visible light up-conversion technique demonstrated in this work would provide significant cost benefits as well as the functional superiority for a broad range of NIR imaging applications.
Furong Zhu is a Professor in the Department of Physics and the Associate Director for Institute of Advanced Materials at Hong Kong Baptist University (HKBU). He received his BSc and MSc in Physics from Fudan University, Shanghai China, in 1983 and 1987. He completed his Ph.D in Applied Physics at Charles Darwin University in Australia from 1990-1993. He did his post-doctoral research in the Department of Electrical and Electronic Engineering at Kyoto University in Japan from 1993-1995, and was a Research Fellow with the Department of Physics at Murdoch University in Australia from 1995-1997 working on silicon thin films derived from plasma enhanced chemical vapor deposition for device application. He joined Institute of Materials Research and Engineering (IMRE) in Singapore in 1997. Prior to HKBU, he was a Senior Scientist and a Program Manager leading the organic light-emitting diode (OLED) and organic photovoltaic (OPV) R&D activities at IMRE. His current interests include organic solar cells, field effective transistors, light-emitting diodes, NIR photodetectors, and perovskite photo electronic devices.