2023年10月26日，应苏州大学放射医学与防护学院、放射医学与辐射防护国家重点实验室分子影像与核医学研究中心的邀请，香港城市大学Andrey L. Rogach教授来访并进行了题为“Perovskite Nanocrystals for Light Emitting Applications”的学术报告。
       Abstract: Chemically synthesized metal halide perovskite nanocrystals have recently emerged as a new class of efficient light emitting materials which are particularly interesting for development of light-emitting diodes (LEDs). Stability of perovskite-based LEDs is still an issue, which can be partially mitigated by proper interface design, such as the use of inter-layer amine terminated carbon dots. As for many other nanocrystals, proper surface passivation is a key to ensure high colloidal stability and processability of perovskites; this can be achieved by employment of multi-amine chelating ligands. The use of the lead-based metal halide perovskites is sometimes considered an issue because of the toxicity concerns related to the lead component. To avoid lead in perovskites, co-doping of cerium and bismuth, as well as tellurium and bismuth into lead-free double perovskite Cs2AglnCl6 nanocrystals is a useful strategy resulting in their improved photoluminescence efficiency.
       Biography: Andrey L. Rogach is a Yeung Kin Man Chair Professor of Photonics Materials at the Department of Materials Science and Engineering, and the Founding Director of the Centre for Functional Photonics (CFP) at City University of Hong Kong. He received his Ph.D. in Physical Chemistry (1995) from the Belarusian State University in Minsk studying formation and properties of silver nanoparticles in different media. He worked as a postdoc and then as a staff scientist at the Institute of Physical Chemistry of the University of Hamburg, Germany from 1995 to 2002. From 2002-2009 he held a tenured position of a lead staff scientist at the Department of Physics and Centre for NanoScience of the University of Munich, Germany, where he completed his habilitation in Experimental Physics on light emission and harvesting with semiconductor nanocrystals. He joined City University of Hong Kong as a Full Professor in 2009 and has been advanced to Chair Professor in 2012. His research focuses on synthesis, assembly and optical spectroscopy of colloidal semiconductor and metal nanocrystals and their hybrid structures, and their use for energy-related and optoelectronic applications. He authored over 500 scientific publications with an h-index of 138 {Google Scholar} in these fields that have been extensively (over 70,000) cited, which ranked him as Highly Cited Researcher (Clarivate Analytics) - Cross-Field 2018 & 2019 and Material Science 2020-2022.