OLED Brightness Enhanced by Controlling Plasmon

A pattern formed by using Oji Paper's microfabrication technology (photo courtesy of Oji Paper)

 Oji Paper Co Ltd will introduce a technology to improve the light extraction efficiency of OLED at the 41st Internepcon Japan, which will take place from Jan 18 to 20, 2012, in Tokyo.

The technology was developed based on a microfabrication technology being developed by Oji Paper. The microfabrication technology is used to form a several-nanometer-wide regular pattern by microparticle coating without using existing technologies such as photolithography and to etch it. The company formed a microstructure on the surface of OLED (the surface of the metal part of the negative electrode) by using the technology.

The surface of OLED sometimes goes into a state called plasmon when it is emitting light. In this state, part of its energy is consumed, resulting in lowering luminous efficiency.

 By forming a nanostructure having a specific pattern on the surface, it becomes possible to turn the plasmon energy into luminous energy, Oji Paper said. As a result, the brightness of OLED can be improved without increasing its power consumption.

Oji Paper confirmed that this method improved the light extraction efficiency of red OLED by about 100%. The company is now making efforts to apply the method to white OLED.

Source: Tech-On