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KETI develops new electrode material and achieves world's most "foldable" substrate

The development of a new highly flexible electrodes opens the way to ultra-thin, foldable electronics

10 Apr 2015 | Editor

According to a news article on the ETNews website Korea Electronics Technology Institute (KETI) recently announced that they had developed what they claim to be the "world’s most ultra flexible" transparent electrode, suitable for OLED devices. The developed electrode is capable of a maximum radius of approximately 0.01mm - essentially folded thinner than a single strand of hair.

The developed transparent electrode also gives high performance - light transmission of more than 90%, sheet resistance reached 8 ohm/sq, and surface roughness of about 0.8nm - similar to the glass substrate used in smart phones. This more than meets the need of current industry criteria for foldable materials - is a radius of curvature of 1mm, sheet resistance of 15 ohm/square, transmission of 85% and surface roughness of 1nm.

This development means that it possible to make an OLED electrode material with a curve radius of about 0.03 mm - one hundredth the size of previous materials. This is expected to lead to displays that can be folded in half like paper and bent more than 50,000 times with degradation in performance.

The transparent electrode material was discovered during the ongoing process development work to improve the flatness of silver nano wires. It was while adjusting the surface roughness by plasma processing in the polymer substrate, an element with the efficiency equivalent to that of OLED was discovered.

KETI - A blue phosphorescence flexible OLED element

Figure: KETI - A blue phosphorescence flexible OLED element

KETI is focused on the research and development of device and process technology for the commercialisation of the next generation of "smart products."

Dr. Kim, Jong-woong, Korea Electronics Technology Institute Display Component Material Research Center said, "We developed an ultra high flexible transparent electrode during our search for a optimal combination for maximizing the performance of nano material."
Han Cheol-jong, executive director of KETI Display Fusion Research Center said, "The transparent electrode will become the core material in increasing the degree of freedom in designing IV devices such as foldable smartphones. We will strive to develop remaining components to lead the Foldable Age."

www.etnews.com    www.keti.re.kr   

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