Clay-based nanocomposite coating for flexible optoelectronics applying commercial polymers

Titelangaben

Kunz, Daniel A. ; Schmid, Jasmin ; Feicht, Patrick ; Erath, Johann ; Fery, Andreas ; Breu, Josef:
Clay-based nanocomposite coating for flexible optoelectronics applying commercial polymers.
In: ACS Nano. Bd. 7 (2013) Heft 5 . - S. 4275-4280.
ISSN 1936-086X
DOI: https://doi.org/10.1021/nn400713e

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Abstract

Transparency, flexibility, and especially ultralow oxygen (OTR) and water vapor (WVTR) transmission rates are the key issues to be addressed for packaging of flexible organic photovoltaics and organic light-emitting diodes. Concomitant optimization of all essential features is still a big challenge. Here we present a thin (1.5 μm), highly transparent, and at the same time flexible nanocomposite coating with an exceptionally low OTR and WVTR (1.0 × 10(-2) cm(3) m(-2) day(-1) bar(-1) and <0.05 g m(-2) day(-1) at 50 RH, respectively). A commercially available polyurethane (Desmodur N 3600 and Desmophen 670 BA, Bayer MaterialScience AG) was filled with a delaminated synthetic layered silicate exhibiting huge aspect ratios of about 25 000. Functional films were prepared by simple doctor-blading a suspension of the matrix and the organophilized clay. This preparation procedure is technically benign, is easy to scale up, and may readily be applied for encapsulation of sensitive flexible electronics.