Light emitting element and manufacturing method for the same

• US 6,924,513 B2
• Filed: 01/28/2003
• Issued: 08/02/2005
• Est. Priority Date: 01/29/2002
• Status: Expired due to Term

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Kinugawa, Yoshiyuki, Akaike, Yasuhiko, Washizuka, Shoichi
• Primary Examiner(s): CRANE, SARA W
• Application Number:
  US10/352,126
• Publication Number:
  US 20040026700A1
• Time in Patent Office: 917 Days
• Field of Search: 257/98, 257/100, 257/95
• US Class Current: 257/98
• CPC Class Codes: H01L 33/20 with a particular shape, e.g. curved or truncated substrate

Abstract

A light emitting element includes: a light emitting layer; a rectangular first principal surface being parallel to the light emitting layer; a rectangular second principal surface opposing to the first principal surface so that the light emitting layer is sandwiched between the first and second principal surfaces; and first through fourth side surfaces of the light emitting element provided with a rough surface, the first through fourth side surfaces connecting between the first principal surface and the second principal surface, respectively so as to define a solid shape.

Claims

1. A light emitting element, comprising:

a light emitting layer;

a rectangular first principal surface being parallel to the light emitting layer, a crystal orientation of the first principal surface being in a range of between a (100) plane and approximately 20 degrees from the (100) plane;

a rectangular second principal surface opposing to the first principal surface so that the light emitting layer is sandwiched between the first and second principal surfaces, a crystal orientation of the second principal surface being in a range of between a (100) plane and approximately 20 degrees from the (100) plane; and

first through fourth side surfaces of the light emitting element provided with a rough surface, the first through fourth side surfaces connecting between the first principal surface and the second principal surface, respectively so as to define a solid shape.

4. The light emitting element of claim 1, wherein a surface roughness interval is in a range of between approximately 0.5 and 5 μ

m.

2. A light emitting element comprising:

a light emitting layer;

a rectangular first principal surface being parallel to the light emitting layer;

a rectangular second principal surface opposing to the first principal surface so that the light emitting layer is sandwiched between the first and second principal surfaces; and

first through fourth side surfaces of the light emitting element providing with a rough surface, the first through fourth side surfaces connecting between the first principal surface and the second principal surface, respectively to define a solid shape.

wherein the first and second side surfaces are disposed opposite each other and between the first and second principal surfaces and having a trapezoid shape for a cross section orthogonal to a set of opposite edges of the first principal surface, and the third and fourth side surfaces are disposed opposite each other and between the first and second principal surfaces and having an inverse-trapezoid shape for a cross section orthogonal to another set of opposite edges of the first principal surface.

5. The light emitting element of claim 2, wherein respective angles between the first principal surface and the first or second side surface, and between the second principal surface and the third or fourth side surface is in a range of between approximately 20 and 40 degrees.

6. The light emitting element of claim 2, wherein crystal orientations of the first and second principal surfaces are in a range of between a (100) plane and approximately 20 degrees from the (100) plane.

7. The light emitting element of claim 2, wherein a surface roughness interval is in a range of between approximately 0.5 and 5 μ

m.

3. A light emitting element comprising:

a light emitting layer;

a rectangular first principal surface being parallel to the light emitting layer;

a rectangular second principal surface opposing to the first principal surface so that the light emitting layer is sandwiched between the first and second principal surfaces; and

first through fourth side surfaces of the light emitting element provided with a rough surface, the first through fourth side surfaces connecting between the first principal surface and the second principal surface, respectively to define a solid shape.

wherein the first and second side surfaces of the light emitting element are configured to have a stress applied thereto and induced in a direction, extending from a set of opposite edges of the first principal surface to a corresponding set of opposite edges of the second principal surface, and the third and fourth side surfaces of the light emitting element are configured to have another stress applied thereto and induced in a reverse direction to the stress, extending from another set of opposite edges of the first principal surface to a corresponding set of opposite edges of the second principal surface.

8. The light emitting element of claim 3, wherein respective angles between the first principal surface and the first or second side surface, and between the second principal surface and the third or fourth side surface is in a range of between approximately 20 and 40 degrees.

9. The light emitting element of claim 3, wherein crystal orientations of the first and second principal surfaces are in a range of between a (100) plane and approximately 20 degrees from the (100) plane.

10. The light emitting element of claim 3, wherein a surface roughness interval is in a range of between approximately 0.5 and 5 μ

m.