讲座题目：Highly-Efficient Perovskite Light-Emitting Diodes Enabled by Synergetic Device Architecture 主讲人：唐建新 教授 主持人：保秦烨 开始时间🎭：2019-10-28 15:00:00 讲座地址：闵行校区信息楼147报告厅 主办单位：物理与电子科学学院、极化材料与器件教育部重点实验室
报告人简介： Prof. Jianxin Tang received his B.Sc. degree in physics from Zhejiang University in 2002, and Ph.D. degree in Physics and Materials Science from City University of Hong Kong in 2006. In 2008, he was appointed professor at the Institute of Nano Functional & Soft Materials (FUNSOM), Soochow University. His current research areas/interests span device physics and surface science on organic and perovskite light-emitting diodes technology for flat panel display and solid-state lighting, and organic/perovskite photovoltaic cells for renewable energy, including localized electronic state and charge barrier formation at organic interfaces, and novel device architectures to improve device performance with interface modification for carrier transport and light manipulation. 报告内容👋🏽🕣： The development of solution-processed inorganic metal halide perovskite light-emitting diodes (PeLEDs) is currently hindered by low emission efficiency due to morphological defects and severe non-radiative recombination in all-inorganic perovskite emitters, as well as the light trapping by substrate and waveguide modes. In this talk, we will introduce our recent progress on bright PeLEDs, where were obtained by synergetic morphology control over cesium lead bromide (CsPbBr3) perovskite films with the combination of two additives. The phenethylammonium bromide (PEABr) additive enables the formation of mixed-dimensional CsPbBr3 perovskites featuring the reduced grain size (<15 nm) and efficient energy funneling, while the dielectric polyethyleneglycol (PEG) additive promotes the formation of highly compact and pinhole-free perovskite films with defect passivation at grain boundaries. Consequently, green PeLEDs achieve a current efficiency (CE) of 37.14 cd/A and an external quantum efficiency (EQE) of 13.14% with the maximum brightness up to 45990 cd/m2 and high color purity. Furthermore, we propose a facile route by adopting the light-extraction nanostructures at the front electrode/perovskite interface to enhance the outcoupling efficiency of waveguided light in PeLEDs. As a result, the maximum EQE and CE of CsPbBr3 PeLEDs are improved to 20.3% and 61.9 cd/A, while retaining spectral and angular independence. Further reducing light loss in the substrate mode, we have achieved the efficiencies of 28.2% and 88.7 cd/A, which represent the highest values reported to date for PeLEDs.These results represent a substantive step towards achieving practical applications of PeLEDs. |
