On 26th Feb. 2021, Prof. Zhan-Hua Wei from Huaqiao University gave a talk entitled” Fabrication of High-Performance Perovskite Optoelectronic Devices ”.

At the seminar, Prof. Wei described visible-light-emitting perovskite LEDs that surpass the quantum efficiency milestone of 20%. This achievement stems from a new strategy for managing the compositional distribution in the device – an approach that simultaneously provides high luminescence and balanced charge injection. Specifically, he mixed a pre-synthesized CsPbBr3 perovskite with a MABr additive, the differing solubilities of which yield sequential crystallization into a CsPbBr3/MABr quasi-core/shell structure. The MABr shell passivates the nonradiative defects that would otherwise be present in CsPbBr3 crystals, boosting the photoluminescence quantum efficiency, while the MABr capping layer enables balanced charge injection. The resulting 20.3% external quantum efficiency represents a substantial step towards the practical application of perovskite LEDs in lighting and display. Prof. Wei also showed some progress of perovskite LEDs and solar cells in his lab.

Prof. Zhan-hua Wei is a full-time professor at the Institute of Luminescent Materials and Information Displays, College of Materials Science and Engineering, Huaqiao University, China. He received his B.S. degree in 2011 from the Department of Chemistry, Xiamen University, China, and his Ph.D. degree in 2015 from Prof. Shihe Yang’s group, Department of Chemistry, Hong Kong University of Science and Technology, China. His current research focuses on the synthesis of perovskite materials, perovskite light-emitting diodes, perovskite solar cells, and other optoelectronic devices. He has published tens of peer-reviewed research papers in scientific journals like Nature, J. Am. Chem. Soc., and Angew. Chem. Int. Ed.