Light-emitting devices with high light collimation
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United States of America Patent
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Nov 27, 2007
Grant Date -
Jul 14, 2005
app pub date -
Feb 7, 2005
filing date -
Apr 15, 2003
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Abstract
Light-emitting devices, and related components, systems and methods are disclosed. In some embodiments, the devices (e.g., light-emitting diodes) comprise a multi-layer stack of materials including a light generating region and a first layer supported by the light generating region. The surface of the first layer may have a dielectric function that varies spatially according to a pattern. The pattern may be configured so that light that emerges from the device via the surface of the first layer is more collimated than a Lambertian distribution of light.
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