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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 11 — May. 28, 2007
  • pp: 6670–6676

Light extraction analysis of GaN-based light-emitting diodes with surface texture and/or patterned substrate

Tsung-Xian Lee, Ko-Fon Gao, Wei-Ting Chien, and Ching-Cherng Sun  »View Author Affiliations


Optics Express, Vol. 15, Issue 11, pp. 6670-6676 (2007)
http://dx.doi.org/10.1364/OE.15.006670


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Abstract

Light extraction analysis of GaN-based light-emitting diodes (LEDs) with Monte Carlo ray tracing is presented. To obtain high light extraction efficiency, periodic structures introduced on the top surface and/or on the substrate of various types of LED are simulated, including wire bonding, flip chip and Thin GaN. Micro pyramid array with an apex angle from 20° to 70° is shown to effectively improve the light extraction efficiency. In addition, for an LED encapsulated within an epoxy lens, the patterned substrate with pyramid array is found to be a more effective way to increase light extraction efficiency than the surface texture.

© 2007 Optical Society of America

OCIS Codes
(230.3670) Optical devices : Light-emitting diodes
(230.3990) Optical devices : Micro-optical devices

ToC Category:
Optical Devices

History
Original Manuscript: February 12, 2007
Revised Manuscript: May 8, 2007
Manuscript Accepted: May 11, 2007
Published: May 16, 2007

Citation
Tsung-Xian Lee, Ko-Fon Gao, Wei-Ting Chien, and Ching-Cherng Sun, "Light extraction analysis of GaN-based light-emitting diodes with surface texture and/or patterned substrate," Opt. Express 15, 6670-6676 (2007)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-15-11-6670


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