Light emitting element

• US 20100117109A1
• Filed: 07/29/2009
• Published: 05/13/2010
• Est. Priority Date: 11/10/2008
• Status: Abandoned Application

• Current Assignee: Hitachi Cable Limited (Proterial Ltd.)
• Original Assignee: Hitachi Cable Limited (Proterial Ltd.)
• Inventors: Unno, Tsunehiro
• Application Number:
  US12/461,007
• Publication Number:
  US 20100117109A1
• Time in Patent Office: Days
• US Class Current: 257/98
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/48465 the other connecting portion not on the bonding area being a wedge bond, i.e. ball-to-wedge, regular stitch
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 33/22 Roughened surfaces, e.g. at the interface between epitaxial layers
• CPC Class Codes: H01L 33/405 Reflective materials
• CPC Class Codes: H01L 33/44 characterised by the coatings, e.g. passivation layer or anti-reflective coating

Abstract

A light emitting element includes a semiconductor stacked structure including a first semiconductor layer of first conductivity type, a second semiconductor layer of second conductivity type different from the first conductivity type and an active layer sandwiched between the first semiconductor layer and the second semiconductor layer. The light emitting element further includes a plurality of convex portions formed on one surface of the semiconductor stacked structure, and an embedded part for transmitting a light emitted from the active layer and reducing stress generated in the plurality of convex portions, the embedded part being formed between two adjacent convex portions of the plurality of convex portions.

Claims

1. A light emitting element, comprising:

a semiconductor stacked structure comprising a first semiconductor layer of first conductivity type, a second semiconductor layer of second conductivity type different from the first conductivity type and an active layer sandwiched between the first semiconductor layer and the second semiconductor layer;

a plurality of convex portions formed on one surface of the semiconductor stacked structure; and

an embedded part for transmitting a light emitted from the active layer and reducing stress generated in the plurality of convex portions, the embedded part being formed between two adjacent convex portions of the plurality of convex portions.

2. The light emitting element according to claim 1, wherein the plurality of convex portions comprise a cross sectional structure that gradually narrows in a direction from the active layer to the one surface of the semiconductor stacked structure.

3. The light emitting element according to claim 2;

wherein the embedded part comprises a material with a refractive index between that of the plurality of convex portions and that of a resin for covering the light emitting element.

4. The light emitting element according to claim 3, wherein the embedded part comprises a material with a linear expansion coefficient of not more than 1×

10<sup>−

5</sup>/K.

5. The light emitting element according to claim 4, wherein the plurality of convex portions comprise, in a cross section, a length of a horizontal part thereof along a horizontal plane parallel to the active layer is not more than a length of a height part thereof in a direction perpendicular to the horizontal plane.

6. The light emitting element according to claim 5, wherein the embedded part comprises a plurality of stacked materials with linear expansion coefficients different from each other.

7. The light emitting element according to claim 5, wherein the embedded part is formed to cover a tip portion of the plurality of convex portions.

8. The light emitting element according to claim 1, wherein the plurality of convex portions comprise a trapezoidal form in a cross section.

9. The light emitting element according to claim 1, wherein the semiconductor stacked structure further comprises a sidewall layer formed at least on a side face of the active layer.