Sapphire substrate having triangular projections with outer perimeter formed of continuous curve
First Claim
1. A sapphire substrate having a principal surface for growing a nitride semiconductor to form a nitride semiconductor light emitting device, the sapphire substrate comprising a plurality of projections on the principal surface,wherein each of the projections has a bottom that has a substantially triangular shape,wherein each side of the bottom of the projections has a depression in its center,wherein each of the projections has an outer perimeter formed of a continuous curve.
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Abstract
A sapphire substrate having a principal surface for growing a nitride semiconductor to form a nitride semiconductor light emitting device comprises a plurality of projections on the principal surface. Each of the projections has a bottom that has a substantially polygonal shape. Each side of the bottom of the projections has a depression in its center. Vertexes of the bottoms of the respective projections extend in a direction that is within a range of ±10 degrees of a direction that is rotated clockwise by 30 degrees from a crystal axis “a” of the sapphire substrate.
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Citations
15 Claims
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1. A sapphire substrate having a principal surface for growing a nitride semiconductor to form a nitride semiconductor light emitting device, the sapphire substrate comprising a plurality of projections on the principal surface,
wherein each of the projections has a bottom that has a substantially triangular shape, wherein each side of the bottom of the projections has a depression in its center, wherein each of the projections has an outer perimeter formed of a continuous curve.
Specification