Lighting system with high and improved extraction efficiency
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United States of America Patent
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app pub date -
Jul 16, 2004
filing date -
Feb 6, 2004
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Abandoned
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Abstract
In an epitaxial structure of a solid state lighting system, electrical current injection into the active layer is used to excite the photon emission. The present invention employs a unique waveguide layer in the epitaxial structure for trapping the light generated by the active layer in the fundamental waveguide mode. Multiple photonic crystal regions with different characteristics located either outside or inside one or more current injection regions extract photons from the waveguide layer(s). The present invention creates solid state lighting with high optical output and high power efficiency.
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