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Efficiency enhancement of flexible organic light-emitting devices by using antireflection nanopillars

Yu-Hsuan Ho, Chung-Chun Liu, Shun-Wei Liu, Hsun Liang, Chih-Wei Chu, and Pei-Kuen Wei

Open Access Open Access

Abstract

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 .

©2011 Optical Society of America

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Figures (6)
Fig. 1
Fig. 1 Diagram of thermal nanoimprint process with AAO template (left), and the fabrication system (right)

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Fig. 2
Fig. 2 Thermal nanoimprint results with AAO template of dimension 100 nm (a) and 200nm.(b) at different imprinting temperature and working pressure. (c) The AFM images of nanopillars made at 150°C, 20 kgw/cm2 (left) and 160°C and 25 kgw/cm2 (right).

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Fig. 3
Fig. 3 (a) Thermal nanoimprint process with AAO template, (b) the device structure, and (c) the SEM graphs of AAO template and patterned PC thin film, and the picture of the flexible device.

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Fig. 4
Fig. 4 (a) Reflectance spectra of AR nanopillars and referenced flat substrate. (b) Average transmittance in visible spectrum (390 nm ~750 nm) at different incident angles

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Fig. 5
Fig. 5 Enhancement ratio (a) and emission spectra (b) of devices with the antireflection substrate (dimension: 200 nm, average height: 153.81 nm) compared to the flat substrate

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Fig. 6
Fig. 6 Picture of a paper covered with the PC film under bright light source and the diagram of the experimental setup

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