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US 5,861,636 AGranted
Surface emitting visible light emiting diode having ring-shaped electrode
AssigneeNEC Corporation
InventorsAchyut Kumar Dutta, Akira Suzuki
Life of this patent
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Abstract
Disclosed is a surface emitting visible light emitting diode, which has: a first conductivity-type substrate; and a first conductivity-type buffer layer, a first conductivity-type cladding layer, an active layer, a second conductivity-type cladding layer, a second conductivity-type current spreading layer and a second conductivity-type cap layer which are in turn grown on the substrate; wherein the second conductivity-type cap layer has a ring shaped electrode formed thereon.
Claims2
A surface emitting visible light emitting diode, comprising:
- a first conductivity-type substrate;
- and
- a first conductivity-type buffer layer,
- a first conductivity-type cladding layer,
- an active layer,
- a second conductivity-type cladding layer,
- a second conductivity-type current spreading layer, and
- a second conductivity-type cap layer, which are in turn grown on said substrate;
- wherein said second conductivity-type cap layer has a ring shaped electrode formed thereon;
- and
- wherein a diameter of said ring shaped electrode, which is based on a numerical aperture and a core diameter of a coupled optical fiber, is such that a coupling efficiency of said ring shaped electrode of said diode to said coupled optical fiber is greater than 50%;
- a lead-frame for mounting said surface emitting visible light emitting diode;
- and
- a molding with a lens formed on said lead-frame, said molding having a refractive index of 1.6 or less.
11 more elements
A surface emitting visible light emitting diode, comprising:
- a first conductivity-type substrate;
- and
- a first conductivity-type buffer layer,
- a first conductivity-type cladding layer,
- an active layer,
- a second conductivity-type cladding layer,
- a second conductivity-type current spreading layer, and
- a second conductivity-type cap layer, which are in turn grown on said substrate;
- wherein said second conductivity-type cap layer has a ring shaped electrode formed thereon;
- and
- wherein a diameter of said ring shaped electrode, which is based on a numerical aperture and a core diameter of a coupled optical fiber, is such that a coupling efficiency of said ring shaped electrode of said diode to said coupled optical fiber is greater than 50%;
- wherein said ring shaped electrode is composed by two or more rings;
- a lead-frame for mounting said surface emitting visible light emitting diode;
- and
- a molding with a lens formed on said lead-frame, said molding having a refractive index of 1.6 or less.
12 more elements
Dependencies are inferred from the claim text.