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• Wei, M
• Lin, C
• Yang, C
• Kiang, Y
• Lee, J
• Lin, H
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• Wei, M
• Lin, C
• Yang, C
• Kiang, Y
• Lee, J
• Lin, H
• [+] on PubMed
• Wei, M
• Lin, C
• Yang, C
• Kiang, Y
• Lee, J
• Lin, H

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Int. J. Mol. Sci. 2010, 11(4), 1527-1545; doi:10.3390/ijms11041527

Review

Emission Characteristics of Organic Light-Emitting Diodes and Organic Thin-Films with Planar and Corrugated Structures

Mao-Kuo Wei ^1,2 , Chii-Wann Lin ^3,4 , Chih-Chung Yang ^3,5 , Yean-Woei Kiang ^3,5,6 , Jiun-Haw Lee ^3,5,*  and Hoang-Yan Lin ^3,5,*

¹ Department of Materials Science and Engineering, National Dong Hwa University, No. 1, Sec. 2, Da Hsueh Rd., Shoufeng, Hualien 97401,Taiwan ² Institute of Opto-Electronic Engineering, National Dong Hwa University, No. 1, Sec. 2, Da Hsueh Rd., Shoufeng, Hualien 97401,Taiwan ³ Department of Electrical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei 10617, Taiwan ⁴ Institute of Biomedical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei 10617, Taiwan ⁵ Graduate Institute of Photonics and Optoelectronics, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei 10617, Taiwan ⁶ Graduate Institute of Communication Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei 10617, Taiwan

* Authors to whom correspondence should be addressed.

Received: 1 February 2010; in revised form: 18 March 2010 / Accepted: 6 April 2010 / Published: 12 April 2010

(This article belongs to the Special Issue Conjugated Polymers)

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Abstract: In this paper, we review the emission characteristics from organic light-emitting diodes (OLEDs) and organic molecular thin films with planar and corrugated structures. In a planar thin film structure, light emission from OLEDs was strongly influenced by the interference effect. With suitable design of microcavity structure and layer thicknesses adjustment, optical characteristics can be engineered to achieve high optical intensity, suitable emission wavelength, and broad viewing angles. To increase the extraction efficiency from OLEDs and organic thin-films, corrugated structure with micro- and nano-scale were applied. Microstructures can effectively redirects the waveguiding light in the substrate outside the device. For nanostructures, it is also possible to couple out the organic and plasmonic modes, not only the substrate mode.

Keywords: OLED; extraction efficiency; microstructure

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