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OLED Manufacturing on Thin Metal Substrates Towards Roll-to-Roll

C. May, J. Hauptmann, F.Schutze, C. Keibler-Wilner, S. Mogck
Fraunhofer Institute of Organic Electronics, Electon Beam and Plasma Technology FEP

Metal foils have also been utilized for several years as substrates for thin-film photovoltaics and batteries. Now metal foils are getting interest as substrates for flexible organic electronic devices. In contrast to substrate materials like glass or plastic web an extra smoothing layer on typically rough metal foils are necessary to reach sufficient device stabilities, in particular for large area OLED lighting. An advantage of metal foils in the organic electronics is the comparatively good electrical and thermal conductivity. This allows for homogenous large-area lighting surfaces with current densities of more than 10 mA/cm². Additionally, metal foils can be applied as top encapsulation on OLED devices on glass or plastic substrate to improve the temperature management during device operation, combined with excellent barrier properties of metal foils. Those benefits of improved temperature management on the OLED device lifetime and better illumination homogeneity will be outlined in the presentation. First results on a full roll-to-roll process chain enabling later high throughput production will be presented.