Stable OLED technology is as thin as cling film

November 28, 2019 //By Julien Happich
OLED sheet
In a collaboration with Japan Broadcasting Corporation (NHK), chemical company Nippon Shokubai Co Ltd. unveiled a 3μm-thick green OLED film technology whose stability in air was greatly improved thanks to high electron injection efficiencies even in the presence of oxygen and moisture.

The prototyped green OLED sheet formed on a 3-micron-thick
film. (source: Nikkei xTech)

The company’s novel electron injection technology uses hydrogen bonding between organic materials to overcome instability issues in air, enabling longer lifetimes for its ultra-thin iOLED devices. Alkali metals, which are often used for electron injection in the electron transport layer, offer high electron injection efficiencies, but fare poorly in environmental stability, turning OLEDs to degrade. The companies have developed a polarization-type OLED material with organic bases added instead of an alkali metal. The new material combines high air stability and high electron injection efficiencies due to its polarization, maintaining high electron injection efficiencies for a long time even when an OLED is formed on a film that easily transmits oxygen and moisture.

The new organic material-based electron supply layer material was developed in cooperation with NHK who aims to commercialize large ultra-thin and rollable OLED displays in the future.

Nippon Shokubai -

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