Date and Time
2023-05-26 14:00
2023-05-26 14:00
Location
Founders Hall
n²STAR Seminar by Prof. Andrey L. Rogach
Chemically synthesized metal halide perovskite nanocrystals have recently emerged as a new class of efficient light-emitting materials which are particularly promising for the development of light-emitting diodes (LEDs) [1]. The stability of perovskite-based LEDs is still an issue [2], which can be partially mitigated by proper interface design, such as the use of inter-layer amine terminated carbon dots [3]. As for many other colloidal nanocrystals, proper surface passivation is key to ensuring high colloidal stability and processability of perovskites; this can be achieved by the employment of multi-amine chelating ligands [4]. We also show how water-stable CsPbBr3/Cs4PbBr6 nanocrystals with a mixed fluoropolymer shell can be applied for optical temperature sensing [5]. The use of lead-based metal halide perovskites is considered an issue because of the toxicity concerns related to the lead component. To avoid using lead in light-emitting perovskites, co-doping of cerium and bismuth [6], as well as tellurium and bismuth [7] into lead-free double perovskite Cs2AgInCl6 nanocrystals is a useful strategy resulting in their improved photoluminescence efficiency.
Face to face
Speaker Information
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 the formation and properties of silver nanoparticles in different media.
