Department of Inorganic Chemistry I, University of Bayreuth, Universitätsstraße 30, 95440 Bayreuth, Germany.
ACS Nano. 2013 May 28;7(5):4275-80. doi: 10.1021/nn400713e. Epub 2013 Apr 4.
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.
透明性、柔韧性，尤其是超低氧气传输率（OTR）和水蒸汽传输率（WVTR），是柔性有机光电和有机发光二极管包装需要解决的关键问题。同时优化所有必要的特性仍然是一个巨大的挑战。在这里，我们提出了一种具有 1.5μm 厚度的、高透明性的、同时也具有柔韧性的纳米复合材料涂层，其具有极低的 OTR 和 WVTR（分别为 1.0×10(-2) cm(3) m(-2) day(-1) bar(-1)和 <0.05 g m(-2) day(-1)在 50%相对湿度下）。一种市售的聚氨酯（拜耳材料科技公司的 Desmodur N 3600 和 Desmophen 670 BA）填充了具有约 25000 的巨大纵横比的剥离合成层状硅酸盐。功能薄膜是通过简单的刮刀涂覆悬浮液基质和有机化粘土来制备的。这种制备方法在技术上是良性的，易于规模化，并且可以很容易地应用于封装敏感的柔性电子产品。
