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Enhanced Light Extraction in GaInN Light-Emitting Diode With Pyramid Reflector

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5 Author(s)
Xi, J.-Q. ; Dept. of Phys, Appl. Phys. & Astron., Rensselaer Polytech. Inst., Troy, NY ; Luo, Hong ; Pasquale, A.J. ; Kim, Ki-Se
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GaInN light-emitting diodes (LEDs) that employ a reflector consisting of an array of three-dimensional (3-D) SiO2 pyramids and a Ag layer are demonstrated to have enhanced light extraction compared with GaInN LEDs with 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 GaInN LEDs with the pyramid reflector show 13.9% higher light output than LEDs with a planar Ag reflector. The enhancement is attributed to the appearance of an additional escape cone for light extraction enabled by the 3-D pyramid reflector

Published in:

Photonics Technology Letters, IEEE  (Volume:18 ,  Issue: 22 )