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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 23 — Nov. 9, 2009
  • pp: 20991–20997

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  »View Author Affiliations

Optics Express, Vol. 17, Issue 23, pp. 20991-20997 (2009)

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We demonstrate the enhancement of light extraction in 633 nm AlGaInP light-emitting diodes (LEDs) with antireflective subwavelength structures (SWS). From the contour plots by the rigorous coupled wave analysis method, it is found that the reduction of the internal reflection strongly depends on the period of SWS. The Ag nanoparticles formed by thermal dewetting were used as an etch mask for dry etch process to fabricate antireflective SWS on the LED surface. The tapered pillars on the GaP were fabricated, on average, with distances below 200 nm, satisfying the required antireflection condition at the emission wavelength. The improvement in light output power by ~26.4% was achieved for the fabricated AlGaInP LEDs with SWS compared to the conventional LEDs due to a strongly reduced Fresnel internal reflection at the GaP/air interface. The improved directionality in the far-field pattern was also obtained due to the directional light extraction enhancement.

© 2009 OSA

OCIS Codes
(230.3670) Optical devices : Light-emitting diodes
(220.4241) Optical design and fabrication : Nanostructure fabrication
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Optical Devices

Original Manuscript: August 17, 2009
Manuscript Accepted: October 23, 2009
Published: November 3, 2009

Y. M. Song, E. S. Choi, J. S. Yu, and Y. T. Lee, "Light-extraction enhancement of red AlGaInP light-emitting diodes with antireflective subwavelength structures," Opt. Express 17, 20991-20997 (2009)

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