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Energy Express

Energy Express

  • Editor: Bernard Kippelen
  • Vol. 19, Iss. S3 — May. 9, 2011
  • pp: A295–A302

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  »View Author Affiliations


Optics Express, Vol. 19, Issue S3, pp. A295-A302 (2011)
http://dx.doi.org/10.1364/OE.19.00A295


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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 OSA

OCIS Codes
(230.3670) Optical devices : Light-emitting diodes
(220.4241) Optical design and fabrication : Nanostructure fabrication

ToC Category:
Light-Emitting Diodes

History
Original Manuscript: February 15, 2011
Manuscript Accepted: April 1, 2011
Published: April 11, 2011

Citation
Yu-Hsuan Ho, Chung-Chun Liu, Shun-Wei Liu, Hsun Liang, Chih-Wei Chu, and Pei-Kuen Wei, "Efficiency enhancement of flexible organic light-emitting devices by using antireflection nanopillars," Opt. Express 19, A295-A302 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-S3-A295


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