Forming LED having angled sides for increased side light extraction
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United States of America Patent
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-
Nov 27, 2001
Grant Date -
Apr 26, 2001
app pub date -
Dec 6, 2000
filing date -
Jun 3, 1997
priority date (Note) -
In Force
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Abstract
The invention is a method for designing semiconductor light emitting devices such that the side surfaces (surfaces not parallel to the epitaxial layers) are formed at preferred angles relative to vertical (normal to the plane of the light-emitting active layer) to improve light extraction efficiency and increase total light output efficiency. Device designs are chosen to improve efficiency without resorting to excessive active area-yield loss due to shaping. As such, these designs are suitable for low-cost, high-volume manufacturing of semiconductor light-emitting devices with improved characteristics.
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