Researchers Achieve Breakthrough in Extending Lifespan of Blue PHOLEDs for OLED Displays

A team of researchers at the University of Michigan has developed a major advancement in organic light-emitting diode (OLED) technology by significantly increasing the lifespan of blue phosphorescent OLEDs (PHOLEDs). Unlike red and green PHOLEDs, which are already used in modern displays due to their high efficiency, blue OLEDs have remained a challenge due to their lower energy efficiency and faster degradation. The team, led by Professor Stephen Forrest, utilized a tandem OLED structure with two emitting layers and incorporated a thin carbon-based semiconductor coating on the electrodes. This design promotes a quantum effect called the Purcell effect, allowing excitons to convert to photons more efficiently via a fast energy transfer path known as a plasmon exciton polariton. This method reduces molecular breakdown and extends the operational life of the blue PHOLEDs to match that of their green counterparts. The findings, published in *Nature Photonics*, represent a critical step forward in achieving energy-efficient, full-color OLED displays. The technology has been patented and licensed to Universal Display Corporation, positioning it for potential commercial integration in next-generation screens.