NHK developed a new inverted-OLED device which requires almost no encapsulation

In 2013, the Japan Broadcasting Corp (NHK) and Nippon Shokubai developed a new OLED structure called inverted OLED, or iOLED, that drastically improves oxygen and moisture resistances. The basic idea behind iOLED is to invert the structure between the electrodes of a bottom-emission OLED. The electrodes are based on an organic material (polyethyleneimine) and not Lithium-based like most electrodes.

NHK full-color iOLED prototype (2015)NHK iOLED (2015)

In 2015, NHK demonstrated a full-color iOLED display that uses a film substrate. The company now demonstrated the same display - more than one year after it was fabricated - still working even though there is almost no encapsulation.

NHK also developed a newer-generation iOLED technology, that uses a new organic material and additive for the electron injection layer. NHK demonstrated a red iOLED device in which the driving voltage was lowered to 3.7V, the internal efficiency returned to 100%, and the emission lifetime was drastically increased to 10,000 hours or longer.

NHK iOLED devices photo (2016)

NHK is now aiming to accelerate the development of green andblue iOLED devices.

Posted: Jul 08,2016 by Ron Mertens