Fabrication of subwavelength structure for improvement in light-extraction efficiency of light-emitting devices using a self-assembled pattern of block copolymer

Abstract

A new fabrication method to improve the optical extraction efficiency of light-emitting devices is presented. The morphology of a self-assembled block copolymer was transferred to the surface of a compound semiconductor to achieve a subwavelength columnar structure. The optical extraction efficiency of the substrates with subwavelength columnar structures of 350 nm pillar height, 130 nm diameter, and 180 nm pitch, improved 2.2 times compared to unprocessed substrates. This method does not require expensive exposure lithography tools and is therefore suitable for conventional semiconductor processes.

© 2005 Optical Society of America

Improvement of the light extraction efficiency of top-emitting organic light-emitting diodes by a two-dimensional diffraction layer fabricated using self-assembled nanoparticles

Tsutomu Nakanishi, Toshiro Hiraoka, Akira Fujimoto, Shigeru Matake, Satoshi Okutani, Hiroshi Sano, and Koji Asakawa
Appl. Opt. 48(31) 5889-5896 (2009)

Design and fabrication of high-index-contrast self-assembled texture for light extraction enhancement in LEDs

Xing Sheng, Lirong Zeng Broderick, Juejun Hu, Li Yang, Anat Eshed, Eugene A. Fitzgerald, Jurgen Michel, and Lionel C. Kimerling
Opt. Express 19(S4) A701-A709 (2011)

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
Opt. Express 19(S3) A295-A302 (2011)

Light-extraction enhancement of red AlGaInP light-emitting diodes with antireflective subwavelength structures

Y. M. Song, E. S. Choi, J. S. Yu, and Y. T. Lee
Opt. Express 17(23) 20991-20997 (2009)

Improved light extraction efficiency in organic light emitting diodes with a perforated WO₃ hole injection layer fabricated by use of colloidal lithography

Chung Sock Choi, Sung-Min Lee, Myung Sub Lim, Kyung Cheol Choi, Donghyuk Kim, Duk Young Jeon, Youngjo Yang, and O Ok Park
Opt. Express 20(S2) A309-A317 (2012)