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Energy Express

  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 8, Iss. 2 — Mar. 4, 2013

Optimal overlayer inspired by Photuris firefly improves light-extraction efficiency of existing light-emitting diodes

Annick Bay, Nicolas André, Michaël Sarrazin, Ali Belarouci, Vincent Aimez, Laurent A. Francis, and Jean Pol Vigneron  »View Author Affiliations


Optics Express, Vol. 21, Issue S1, pp. A179-A189 (2013)
http://dx.doi.org/10.1364/OE.21.00A179


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Abstract

In this paper the design, fabrication and characterization of a bioinspired overlayer deposited on a GaN LED is described. The purpose of this overlayer is to improve light extraction into air from the diode’s high refractive-index active material. The layer design is inspired by the microstructure found in the firefly Photuris sp. The actual dimensions and material composition have been optimized to take into account the high refractive index of the GaN diode stack. This two-dimensional pattern contrasts other designs by its unusual profile, its larger dimensions and the fact that it can be tailored to an existing diode design rather than requiring a complete redesign of the diode geometry. The gain of light extraction reaches values up to 55% with respect to the reference unprocessed LED.

© 2013 OSA

OCIS Codes
(230.3670) Optical devices : Light-emitting diodes
(260.6970) Physical optics : Total internal reflection
(290.1990) Scattering : Diffusion

ToC Category:
Light-Emitting Diodes

History
Original Manuscript: October 10, 2012
Revised Manuscript: December 6, 2012
Manuscript Accepted: December 7, 2012
Published: January 8, 2013

Virtual Issues
Vol. 8, Iss. 2 Virtual Journal for Biomedical Optics

Citation
Annick Bay, Nicolas André, Michaël Sarrazin, Ali Belarouci, Vincent Aimez, Laurent A. Francis, and Jean Pol Vigneron, "Optimal overlayer inspired by Photuris firefly improves light-extraction efficiency of existing light-emitting diodes," Opt. Express 21, A179-A189 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-S1-A179


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