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Energy Express

Energy Express

  • Editor: Bernard Kippelen
  • Vol. 19, Iss. S2 — Mar. 14, 2011
  • pp: A166–A172

Antireflective sub-wavelength structures for improvement of the extraction efficiency and color rendering index of monolithic white light-emitting diode

Yiyu Ou, Dennis Dan Corell, Carsten Dam-Hansen, Paul Michael Petersen, and Haiyan Ou  »View Author Affiliations


Optics Express, Vol. 19, Issue S2, pp. A166-A172 (2011)
http://dx.doi.org/10.1364/OE.19.00A166


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Abstract

We have theoretically investigated the influence of antireflective sub-wavelength structures on a monolithic white light-emitting diode (LED). The simulation is based on the rigorous coupled wave analysis (RCWA) algorithm, and both cylinder and moth-eye structures have been studied in the work. Our simulation results show that a moth-eye structure enhances the light extraction efficiency over the entire visible light range with an extraction efficiency enhancement of up to 26 %. Also for the first time to our best knowledge, the influence of sub-wavelength structures on both the color rendering index (CRI) and the correlated color temperature (CCT) of the monolithic white LED have been demonstrated. The CRI of the monolithic white LED could be improved from 92.68 to around 94 by applying a cylinder structure, and the CCT could be modified in a very large range with appropriate design of the cylinder structure.

© 2011 Optical Society of America

OCIS Codes
(230.3670) Optical devices : Light-emitting diodes
(310.1210) Thin films : Antireflection coatings
(330.1715) Vision, color, and visual optics : Color, rendering and metamerism
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Light-Emitting Diodes

History
Original Manuscript: January 10, 2011
Revised Manuscript: February 10, 2011
Manuscript Accepted: February 10, 2011
Published: February 15, 2011

Citation
Yiyu Ou, Dennis D. Corell, Carsten Dam-Hansen, Paul M. Petersen, and Haiyan Ou, "Antireflective sub-wavelength structures for improvement of the extraction efficiency and color rendering index of monolithic white light-emitting diode," Opt. Express 19, A166-A172 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-S2-A166


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