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Proceedings Paper

High light-extraction efficiency in GaInN light-emitting diode with pyramid reflector
Author(s): J-Q. Xi; Hong Luo; Jong Kyu Kim; E. F. Schubert
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Paper Abstract

A GaInN light-emitting diode (LED) that employs a new type of reflector consisting of an array of SiO2 pyramids and a reflective Ag layer is demonstrated to have enhanced light extraction compared to GaInN LEDs with a planar Ag reflector. Ray tracing simulations reveal that the pyramid reflector provides 14.1% enhancement in extraction efficiency. Consistent with the simulation, it is experimentally demonstrated that the GaInN LED employing the pyramid-patterned Ag reflector shows 13.9% higher light-output compared to the LED with a planar Ag reflector. In addition, the GaInN LED with pyramid reflector shows uniform light intensity due to current spreading beneath the SiO2 pyramid pattern. The enhancement is attributed to the appearance of an additional escape cone for light extraction, enabled by the change in direction of light rays reflected by the 3-dimensional pyramid reflector.

Paper Details

Date Published: 12 February 2007
PDF: 8 pages
Proc. SPIE 6486, Light-Emitting Diodes: Research, Manufacturing, and Applications XI, 648606 (12 February 2007); doi: 10.1117/12.707267
Show Author Affiliations
J-Q. Xi, Rensselaer Polytechnic Institute (United States)
Hong Luo, Rensselaer Polytechnic Institute (United States)
Jong Kyu Kim, Rensselaer Polytechnic Institute (United States)
E. F. Schubert, Rensselaer Polytechnic Institute (United States)

Published in SPIE Proceedings Vol. 6486:
Light-Emitting Diodes: Research, Manufacturing, and Applications XI
Klaus P. Streubel; Heonsu Jeon, Editor(s)

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