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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 9 — Apr. 28, 2008
  • pp: 6026–6032

Angle-tuned, evanescently-decoupled reflector for high-efficiency red light-emitting diode

Sun-Kyung Kim, Hyun Kyong Cho, Kyung Keun Park, Junho Jang, Jeong Soo Lee, Kyung Wook Park, Youngho Park, Ju-Young Kim, and Yong-Hee Lee  »View Author Affiliations


Optics Express, Vol. 16, Issue 9, pp. 6026-6032 (2008)
http://dx.doi.org/10.1364/OE.16.006026


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Abstract

We propose and demonstrate evanescently-decoupled, solid-angle-optimized distributed Bragg reflectors (DBRs) for AlGaInP light-emitting diodes (LEDs). The thickness of each DBR layer is tuned to the wavelength slightly longer than the emission peak of the active medium in order to maximize the radiated power integrated over the top surface. In addition, to increase the horizontal radiation through the side facets, the glancing-angle reflectivity at the AlInP/AlAs interface is improved by employing an AlAs layer thicker than the attenuation length of the evanescent field. With the improved DBR, the integrated output power of AlGaInP LEDs is enhanced by a factor of 1.9 in comparison to those of LEDs with conventional DBRs. Additional 1.25-fold enhancement is observed by incorporating an square-lattice hole array (a=1200nm) into the top GaP surface by a conventional photolithography.

© 2008 Optical Society of America

OCIS Codes
(230.1480) Optical devices : Bragg reflectors
(230.3670) Optical devices : Light-emitting diodes
(050.5298) Diffraction and gratings : Photonic crystals

ToC Category:
Optical Devices

History
Original Manuscript: February 11, 2008
Revised Manuscript: April 9, 2008
Manuscript Accepted: April 9, 2008
Published: April 14, 2008

Citation
Sun-Kyung Kim, Hyun K. Cho, Kyung K. Park, Junho Jang, Jeong S. Lee, Kyung W. Park, Youngho Park, Ju-Young Kim, and Yong-Hee Lee, "Angle-tuned, evanescently-decoupled reflector for high-efficiency red light-emitting diode," Opt. Express 16, 6026-6032 (2008)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-16-9-6026


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