Novaled intensifies development of top emitting OLEDs
February 14, 2007, Dresden, Germany--Novaled has announced lifetimes for blue OLEDs up to 16,000 hours, for red and green up to 100,000 hours at an initial brightness of 500 cd/m². This latest performance means that green OLED devices are now outperforming their bottom emission reference samples by a factor of 2.5, according to the company. White top emission devices achieved a lifetime of 18,000 hours at a driving voltage of 3 V and a starting luminance of 1,000 cd/m².
Novaled is also claiming the lowest ever reported operating voltage for green top emission OLED stacks, 2.5 V at 1,000 cd/m². At 95 cd/A, the current efficiency is even higher than for comparable bottom emission devices.
Top emission OLED structures emitting light away from the substrate are a key feature of future OLED applications, according to a company statement. The top emission type increases the aperture ratio above 50% for displays and paves the way for more powerful, large area active-matrix displays. When used in lighting devices, top emission OLEDs enable manufacturers to use cheap non-transparent and flexible substrates.
"Top emission OLEDs are the future of display and lighting applications," said Jan Blochwitz-Nimoth, CTO of Novaled. "Our technology is currently being tested by different OLED manufacturing companies preparing their entry into mass production."
For more information, visit Novaled.