中国科学技术大学发表最新Nature论文

Core Viewpoint - Metal halide perovskite is a promising candidate for next-generation light-emitting diodes (LEDs), with a focus on achieving high brightness and efficiency in pure red perovskite LEDs (PeLEDs) [2] Group 1 - The research team from the University of Science and Technology of China and the Shanghai Institute of Advanced Studies identified the performance bottleneck of pure red PeLEDs, leading to the successful development of high-performance pure red perovskite LEDs [2] - The study revealed that efficiency roll-off is caused by hole leakage, which was investigated using electroluminescence transient absorption spectroscopy (EETA) [4] - A novel CsPbI3-xBrx intragrain heterostructure was developed, incorporating narrow bandgap emitters and wide bandgap barriers to limit injected carriers, resulting in bright and efficient pure red PeLEDs [4] Group 2 - The new PeLEDs achieved a brightness of 24,600 candela per square meter, which is three times higher than previously reported pure red 3D perovskite LEDs [4] - The peak external quantum efficiency (EQE) reached 24.2%, comparable to top organic light-emitting diodes (OLEDs), with low efficiency roll-off maintaining 10.5% EQE at a high brightness of 22,670 candela per square meter [4]