报告时间：2024年7月27日 上午10:00 (10:00, July27, 2024)

报告地点：物质楼C404会议室(RoomC404 , Material Science Building)

报告题目：Advances and challenges toward high-efficient colloidal quantum dots: synthesis, surface chemistry, and their optoelectronic device applications

报告人：Prof. Jong-Soo Lee, Daegu Gyeongbuk Institute of Science & Technology (DGIST)

报告摘要：

Semiconductor colloidal quantum dots (CQDs) have made remarkable progress due to their attractive size-tunable electronic and optical properties, low-cost production, high efficiency, and high stability. In particular, Indium phosphide (InP) quantum dots (QDs) have attracted a great deal of attention in next-generation display technologies, owing to their low intrinsic toxicity and tunable emission from visible to near-infrared region. Despite recent progress in improving the optical properties of InP-based QDs, current synthesis methods have often failed to produce InP QDs with high quantum yield and narrow size distributions, a prerequisite for realizing high color pure emissions. Recently, our group report the importance of precisely controlling the reaction kinetics of InP QDs by a two-step growth process to achieve the narrowest size distribution, engineering the shell coating to reduce interfacial defects for high photoluminescence yield quantum yield (PLQY). In this talk, I will introduce the great synthetic progress of colloidal QDs, based on the surface chemistry and the interfacial engineering of QDs. By optimizing synthesis conditions, the as-synthesized InP QDs core-multishell exhibited a bright green and red emission with a very high quantum yield and the narrowest emission linewidth of more than 90% and less than 33 nm, respectively. In addition, I would like to introduce the results of research related to the synthesis of various QDs that can cover up to NIR in various visible light regions that our group is synthesizing. Finally, I will discuss the challenges related to the recent developments of QLEDs and the challenges for achieving high-performance devices.

报告人简介：

Professor Jong-Soo Lee received his Ph.D. degree from the Department of Metallurgical Engineering at Jeonbuk National University in 1999. He is currently serveing as the Dean of Graduate School and a full professor in the Department of Energy Science and Engineering at DGIST. His research group primarily focuses on exploring the chemistry, physics, and application of inorganic nanomaterials, specifically zero-dimensional (0-D) quantum dots and two-dimensional (2-D) semiconducting materials. The group's research endeavors aim to advance electronic and optoelectronic device technologies.