OLED roll is 30m long, ITO-free
The electrode substrate SEFAR TCS Planar, is manufactured in a roll-to-roll process and boasts conductivity up to 0.01 Ohm/Square with a transparency above 87%. It is based on metal wires about 40µm in diameter woven with semi-transparent polymer fibres, coated with an optically clear polymer. Earlier this year, Sefar AG and Swiss research centre CSEM had demonstrated the usability of such a transparent flexible foil for large area OLEDs in place of brittle ITO solutions.
One challenge in the development of Sefar TCS Planar was getting the surface as smooth as possible while parts of the metallic wires still emerge on the surface forming the electrical contact to the OLED.
“We processed the OLED in vacuum in a roll-to-roll process on Sefar TCS Planar substrates with a specially developed drying process and barrier film lamination. Altogether we deposited an OLED roll 30m long and 30cm wide and designed an OLED as large as 250 cm²”, commented Stefan Mogck, head of department roll-to-roll organic technology at Fraunhofer FEP.
Sefar AG – www.sefar
Fraunhofer FEP – www.fep.fraunhofer.de
Related articles:
Conductive transparent fabrics: a rugged ITO alternative
Roll-to-roll process supports over-molded leds on flexible foil
Fraunhofer ready for continuous roll-to-roll processing on flexible thin glass
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