Title: Perovskite LEDs: high efficiency and high brightness
Time: 9:00 on January 9, 2020
Location: Information Building 133
Speaker: Wang Jianpu
Moderator: Professor Wu Xing
Introduction of the speaker:
Wang Jianpu, Changjiang Scholar Distinguished Professor of the Ministry of Education. In 2009, he received his Ph.D. degree from the Cavendish Laboratory of the University of Cambridge, UK, and engaged in post-doctoral research. He once engaged in organic LED display technology research and development at Samsung Electronics Korea headquarters. In 2013, he joined the Advanced Materials Research Institute of Nanjing University of Technology, and served as the executive deputy Dean in 2017, and won the National Science Fund for Outstanding Youth. As one of the pioneers of perovskite LED research in the world, he proposed the academic idea of realizing high-efficiency luminescence with self-assembled multi-quantum well perovskite and micro-structure perovskite, and created efficiency records for many times. He invented the organic LED display pixel design patent, which greatly improves the life of the display panel, and the patent has been applied for large-scale commercialization. The results published in Nature and other journals, and selected into the 2016 annual Top Ten Chinese universities science and technology show. He participated in the establishment of the academic journal npj Flexible Electronics under the Nature Publishing Group and served as the deputy editor.
Solution-processed light-emitting diodes (LEDs) are attractive for applications in low-cost, large-area lighting sources and displays. Organometal halide perovskites can be processed from solutions at low temperatures to form crystalline direct-bandgap semiconductors with intriguing optoelectronic properties, such as high photoluminescence yield, good charge mobility and excellent color purity. In this talk, I will present our effort to boost the efficiency of perovskite LEDs to a high level which is comparable to organic LEDs. More importantly, organic LEDs are difficult to maintain high efficiency at high current densities due to their excitonic nature and low charge mobilities. Low temperature solution-processed perovskite LEDs demonstrate remarkably high efficiency at high current densities, suggesting unique potential to achieve large size planar LEDs with high efficiency at high brightness.