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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 17 — Aug. 17, 2009
  • pp: 14791–14799

Nanopatterned aluminum nitride template for high efficiency light-emitting diodes

Sang-Mook Kim, Tae-Young Park, Seong-Ju Park, Seung-Jae Lee, Jong Hyeob Baek, Yun Chang Park, and Gun Young Jung  »View Author Affiliations


Optics Express, Vol. 17, Issue 17, pp. 14791-14799 (2009)
http://dx.doi.org/10.1364/OE.17.014791


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Abstract

Nanopatterned aluminum nitride (NP-AlN) templates were used to enhance the light extraction efficiency of the light-emitting diodes (LEDs). Here, the NP-AlN interlayer between the sapphire substrate and GaN-based LED was used as an effective light outcoupling layer at the direction of bottom side and as a buffer layer for growth of GaN LEDs. The cross-sectional transmission electron microscopy (TEM) analysis showed that the formation of stacking faults and voids could help reduce the threading dislocations. Micro Raman spectra also revealed that the GaN-based epilayer grown on the NP-AlN template had smaller residual stress than that grown on a planar sapphire substrate. The normalized electroluminescence (EL) spectra at the top and bottom sides of device revealed that the enhancement of the bottom side emission of the LED with the NP-AlN interlayer was more notable than a planar sapphire substrate due to the graded-refractive-index (GRIN) effect of the NP-AlN.

© 2009 OSA

OCIS Codes
(170.5660) Medical optics and biotechnology : Raman spectroscopy
(230.0250) Optical devices : Optoelectronics
(230.3670) Optical devices : Light-emitting diodes
(290.5880) Scattering : Scattering, rough surfaces
(310.6860) Thin films : Thin films, optical properties
(110.4235) Imaging systems : Nanolithography
(220.4241) Optical design and fabrication : Nanostructure fabrication

ToC Category:
Optical Devices

History
Original Manuscript: July 1, 2009
Revised Manuscript: July 30, 2009
Manuscript Accepted: July 31, 2009
Published: August 5, 2009

Citation
Sang-Mook Kim, Tae-Young Park, Seong-Ju Park, Seung-Jae Lee, Jong Hyeob Baek, Yun Chang Park, and Gun Young Jung, "Nanopatterned aluminum nitride template for high efficiency light-emitting diodes," Opt. Express 17, 14791-14799 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-17-14791


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