Stable and efficient phosphorescence blue OLED emitters - latest research report

This presentation will introduce the phosphorescent organic light emitting devices (PHOLEDs) lifetime problems and lifetime extending techniques. Due to their vibrant colors and high efficiencies, PHOLEDs have been widely used in both display and lighting applications. However, stability remains a significant issue for blue PHOLEDs, hindering their widespread application. In the recent study, the polariton-enhanced Purcell effect has been found to efficiently increase the device operational lifetime by a moderate estimate of 10-14 times compared to the reported similar PHOLED devices up to date. The newly discovered plasmon-exciton-polaritons (PEPs) and cavity structures enable phosphors to emit faster without compromising their external quantum efficiency. The increased radiative emission rate in an optical cavity, known as Purcell effect, is modulated by the Purcell factor contributed by the PEPs. Our results also show the analytical dependence for the device lifetime on the Purcell factor, emission color etc. This method can be combined with other lifetime extending techniques, paving the way for stable, efficient PHOLED display and lighting applications.