Abstract
In this paper, we propose a vertical structure of light emitting diodes (LEDs) grown on a substrate embedded with a photonic crystal reflector to avoid light absorption in the absorbed substrate. Photonic crystal (PC) patterns are embedded in the interface between the epitaxial layer and substrate. Numerical simulation results prove that for both polarizations, there exists a range of PC lattice period, within which 1D or 2D PC patterns can demonstrate high reflectivity and function as a resonance reflector. LEDs grown on such a high reflective patterned substrate can achieve great omnidirectional emission enhancement compared with the conventional LEDs. In addition, we found that the combining of PCs with the surface of such LEDs can further enhance the emission and redistribute the photon energy. Embedding such an interfacial PC reflector might prove to be a promising method for enhancing the extraction efficiency of high-brightness LEDs.
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