Idemitsu Kosan Co Ltd exhibited prototypes of white OLED lighting panels using its organic electroluminescent (EL) materials at Green Device 2009.
One of those prototypes has a high color temperature and uses phosphorescent materials for the red and green colors and a fluorescent material for the blue color. The luminous efficiencies of Idemitsu's phosphorescent materials are twice as high as those of fluorescent materials, contributing to lowering the power consumption of organic EL lighting apparatuses, the company said.
The phosphorescent material for the red color has already been commercialized. Idemitsu has almost commercialized the phosphorescent material for the green color and is now developing technologies to reduce its production costs.
As for the phosphorescent material for the blue color, the company still cannot tell when it will be commercialized because its lifetime is only 1/10 that required by the company's clients at this point.