Ho Yu-Hsuan, Liu Chung-Chun, Liu Shun-Wei, Liang Hsun, Chu Chih-Wei, Wei Pei-Kuen
Research Center for Applied Sciences, Academia Sinica, Taipei 115, Taiwan.
Opt Express. 2011 May 9;19 Suppl 3:A295-302. doi: 10.1364/OE.19.00A295.
We present an antireflection structure consisted of irregular nanopillars to increase light extraction efficiency of flexible organic light-emitting devices. The nanopillars were made by imprinting the anodized aluminum oxide on polycarbonate substrates. The thermal viscosity effect formed the nanopillars with tapered shapes. Such nanopillars show excellent antireflection properties for a wide range of incident angles and wavelengths. The normal transmittance was improved from 85.5% to 95.9% for 150-nm-height nanopillars. The transmittance was greatly improved from 52.8% to 89.1% at 60° incident angle. With this antireflection structure, the device efficiency was improved 69% as compared to devices with flat substrates. Due to wide-angle antireflection, the image contrast ratio was also significantly improved.
我们展示了一种由不规则纳米柱组成的抗反射结构，以提高柔性有机发光器件的光提取效率。这些纳米柱是通过将阳极氧化铝压印在聚碳酸酯基板上制成的。热粘度效应形成了具有锥形形状的纳米柱。这种纳米柱在很宽的入射角和波长范围内都表现出优异的抗反射性能。对于高度为150纳米的纳米柱，正透射率从85.5%提高到了95.9%。在60°入射角下，透射率从52.8%大幅提高到了89.1%。采用这种抗反射结构后，与具有平坦基板的器件相比，器件效率提高了69%。由于具有广角抗反射特性，图像对比度也得到了显著提高。
