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Technical Insight

UDC announces blue organic emitters (Opto News)

UDC and its research partners at Princeton University and the University of Southern California (USC) have developed the world s first efficient blue phosphorescent-based OLED. When combined with red and green phosphorescent OLEDs, the blue emitter establishes the primary color palette and promises to open markets to full-color, active matrix OLED displays. In traditional OLEDs, the light emission is obtained by fluorescence, which results from a transition from a singlet excited state of a material. An OLED doped with fluorescent material has an upper efficiency limit of 25%. Using electro-phosphorescent materials as the color dopant, both singlet and triplet excited states are exploited, extending the efficiency limit to almost 100%. According to principal investigator Mark Thompson of USC, phosphores-cent materials offer considerable power efficiency advantages compared to fluorescent OLEDs, which are being developed by companies such as Eastman Kodak and Cambridge Display Technologies. "Efficiency is critical for long battery life in portable display applications, and longer lifetimes for video monitor applications," he says. The new device consists of a fluorinated iridium organometallic complex with a luminous efficiency of around 12 cd/A. The initial lifetime is several hundred hours, which exceeds that of UDC s phosphorescent green OLED when it was first developed last year. UDC s green device is now capable of a lifetime of 10 000 hours, making it equivalent to inorganic LEDs. UDC is developing strategic collaborations with a view to eventual commercialization, including one with MOCVD system manufacturer Aixtron to produce OLED thin film production equipment.
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