Enhancing the efficiency of blue organic light-emitting diodes by using a dual emitting layers structure Blue, as one of the three primary colors, plays a crucial role in the advancement of high-efficiency organic light-emitting diodes (OLEDs). However, achieving high-performance blue OLEDs remains a significant challenge in flat-panel display technology. In this study, we developed highly efficient blue phosphorescent OLEDs (PhOLEDs) by employing a dual emitting layer (EML) structure.
