Abstract
Photonic-crystal (PhC)-assisted light extraction is a promising method
for ultrahigh efficiency, planar light-emitting diodes (LEDs). However, modeling
of such structures is challenging due to the variety of their parameters and
the heavy computational burden they represent. We present a thorough theoretical
discussion of the optimization of PhC LEDs, which relies both on approximate
treatments and on rigorous 3-D calculations. Two material systems (GaAs and
GaN) are investigated, leading to quite different optimal regimes. Notably,
it appears that besides the properties of the 2-D PhC itself, design of the
vertical structure plays a major role in optimization.
© 2007 IEEE
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