High light-extraction efficiency in GaInN light-emitting diode with pyramid reflector

J-Q. Xi; Hong Luo; Jong Kyu Kim; E. F. Schubert

doi:10.1117/12.707267

12 February 2007 High light-extraction efficiency in GaInN light-emitting diode with pyramid reflector

J-Q. Xi, Hong Luo, Jong Kyu Kim, E. F. Schubert

Proceedings Volume 6486, Light-Emitting Diodes: Research, Manufacturing, and Applications XI; 648606 (2007) https://doi.org/10.1117/12.707267
Event: Integrated Optoelectronic Devices 2007, 2007, San Jose, California, United States

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.

Citation Download Citation

J-Q. Xi, Hong Luo, Jong Kyu Kim, and E. F. Schubert "High light-extraction efficiency in GaInN light-emitting diode with pyramid reflector", Proc. SPIE 6486, Light-Emitting Diodes: Research, Manufacturing, and Applications XI, 648606 (12 February 2007); https://doi.org/10.1117/12.707267

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