The new phosphorescent polymer organic EL device uses a dielectric layer to adjust light reflection in the structures of the negative electrode, luminescent layer,
positive electrode and glass substrate, reducing the amount of light captured in the device. Showa Denko K.K. used a coating process to develop a phosphorescent polymer organic OLED device whose light extraction efficiency was enhanced to 40% by employing a new device structure.
Showa Denko plans to advance the development of the organic EL device by making improvements to the device structure in cooperation with SRI International, a US-based independent nonprofit research institute, and Itochu Plastics Inc. Showa Denko intends to launch samples in the lighting market in 2010. The company has already developed a white organic EL device with a luminance half life of about 10,000 hours. And the goal
is to achieve a luminance efficiency of 150lm/W and to develop a white organic EL device with a luminance half life of 50,000 hours.
