P‐219: Narrowband Blue Phosphorescent OLEDs with High Efficiency, Color Purity and Low‐Voltage

Blue phosphorescent materials, capable of 100% internal quantum efficiency (IQE), have attracted considerable interest in the organic light‐emitting diode (OLED) field, yet they present formidable challenges. In this work, a blue phosphorescent device was reported, demonstrating a blue index (BI) of 373, voltage of 3.72 V, CIE coordinates of (0.139, 0.046), and an operational lifetime (LT95 at 1000 nits) of 139 h, achieving breakthroughs in efficiency, driving voltage, and color purity.