Journal
OPTICS COMMUNICATIONS
Volume 283, Issue 11, Pages 2446-2450Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2010.01.056
Keywords
Light-emitting diodes; Sub-wavelength structure; Nanostructure fabrication
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InGaAIP/GaAs red light-emitting diodes (LEDs) with a sub-wavelength moth-eye structure at the output surface were demonstrated. A high-resolution polydimethylsiloxane (h-PDMS) casting material was used for the fabrication of the moth-eye structure from polymer template which was fabricated by hot embossing. The h-PDMS mold was subsequently used to transfer the nanostructure on the output surface of the LED by soft embossing. We succeeded in forming a close packed hexagonal array of hemispheres with 300 nm pitch, and 128 nm depth. With 10 mA driving current, the corresponding efficiency (cd/A) of moth-eye-structured light-emitting diodes was enhanced by 36% compared with those of non-patterned LEDs. The experimental results are in agreement with the results of a theoretical analysis of the effect of the moth-eye structure. (C) 2010 Elsevier B.V. All rights reserved.
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