Abstract
ABSTRACT A GaInN light-emitting diode (LED) that employs a new type of reflector consisting of an array of SiO 2 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 demons trated that the GaInN LED em ploying the pyramid-patterned Ag reflector shows 13.9% higher light-output compared to th e LED with a planar Ag refl ector. In addition, the GaInN LED with pyramid reflector shows uniform light intensity due to current spreading beneath the SiO 2 pyramid pattern. The enhancement is attributed to the ap pearance of an additional escape cone for light extraction, enabled by the change in direction of light rays reflected by the 3-dimensional pyramid reflector. Keywords: Light-emitting diode, light-extraction efficiency, reflector, 3-dimensional reflector
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