PNNL Researchers Achieve Record Quantum Efficiency in a Blue OLED Device
June 8, 2006
Scientists at Pacific Northwest National Laboratory (PNNL) have successfully demonstrated a blue organic light emitting diode (OLED) device with an external quantum efficiency (EQE) of 8% at 800 cd/m2, exceeding their previous record EQE of 5%. This achievement is particularly notable since it was produced at a much lower operating voltage than previous demonstrations, revealing the potential for much higher power efficiencies. The PNNL team has designed a new way to build molecular structures from small fragments, which successfully combines the optical properties of small, blue emitting molecules with the thin film properties of larger molecules. This breakthrough will enable an entire new class of improved efficiency OLED devices appropriate for Solid State Lighting, and represents an important milestone toward DOE’s long-term research goal of 160 lumens per watt in cost-effective, market-ready systems by 2025. Visit the DOE Solid-State Lighting Web site for more information on this research.