January 3, 2007 – Universal Display Corp., a developer of OLED technologies and materials, and Nippon Steel Chemical Co. Ltd., a provider of super-purified OLED materials, say they have achieved a “significant enhancement” in the performance of green phosphorescent OLEDs, doubling the device’s operational lifetime while maintaining existing color and efficiency characteristics.
The device, encompassing UDC’s green phosphorescent emitter and proprietary blocking layer material with Nippon Steel’s new green host material, achieved 60,000 hours operational lifetime with initial luminance of 1000 candelas/sq. m. It also exhibits high luminous efficiency of 65 candela/ampere and external quantum efficiency of 18% (also at 1000 candelas/sq. m). The lifetime represents more than a two-fold increase in stability compared with previously reported performance, the companies noted.
UDC and Nippon Steel already collaborated for vacuum-deposited phosphorescent red OLEDs, and are now working on blue phosphorescent materials. “We are determined to realize full-color phosphorescent OLED materials, including blue phosphorescent OLED materials, which is the next milestone of the collaboration,” said Yasuhiro Shimoura, executive officer and GM at Nippon Steel’s organic display materials division.