A white OLED device with extremely high power efficiency and long lifetime was developed, in which blue, yellow-green, and red phosphorescent emitters were used. The performances achieved were 64 lm/W and 10,000 hours of lifetime at an initial luminance of 1000 cd/m 2 by using a light outcoupling technique. The device also exhibited the good durability important for practical usage. New technologies, such as blue phosphorescent materials and a sophisticated organic layer structure, were applied to the device. Hopefully, these technologies will open the door to the practical use of OLEDs as light sources.
We developed white OLED device with extremely high power efficiency and long lifetime, in which blue, yellow-green and red phosphorescent emitters were used. The performance achieved was 64lm/W, and 10000 hours of lifetime at initial luminance of 1000cd/m 2 with light out-coupling technique. New technologies, such as blue phosphorescent materials and sophisticated organic layer structure, were applied to the device. The device also exhibited good durability such as storage stability, which is important performance in practical use. We hope that the development discussed in this paper opens up a course to practical use of OLED in lighting sources for illumination use, backlights and others.
Expectation to progress of OLED
A highly efficient OLED lighting product using allphosphorescent technology, for the first time in the world, is presented. Using proprietary blue phosphorescent emitter, 45 lm/W white emission is achieved at 2800K color temperature. The produced panel has very low driving voltage and small color shift regarding the viewing angle. The successful commercialization of all-phosphorescent technology would bring great power saving feature for OLED to compete with other technologies.
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