器件寿命可提升250倍，美国密歇根大学研究新型蓝色磷光OLED材料

Core Viewpoint - A research team led by Professor Forrest from the University of Michigan has developed a new blue phosphorescent OLED (PHOLED) material that significantly enhances the lifespan of OLED devices, providing a viable path for commercial blue PHOLED devices [1][5]. Group 1 - The new design of the tandem device using this OLED material has a lifespan that is 250 times longer than traditional single-layer PHOLED devices [1]. - The researchers employed a Polariton-enhanced Purcell (PEP) effect on both the cathode and anode to achieve this significant lifespan improvement, resulting in the creation of PEP-PHOLED devices [3]. - The blue color coordinates of the new device are CIExy = (0.14, 0.12), indicating its color performance [3]. Group 2 - A notable achievement of the research is a tandem PEP-PHOLED device based on a platinum (Pt) complex, which has achieved an LT90 lifespan of 1,800 hours at a brightness of 500 cd/m² and has a front external quantum efficiency (EQE) of 56% [4]. - The University of Michigan has been developing commercial blue PHOLED devices for over 20 years and has collaborated closely with several display companies, including Universal Display, which recently announced that its blue PHOLED materials are nearing commercialization [4]. - LG Display has also validated the performance of the new material in a hybrid tandem structure device [4].