Radiation emitting body and method for producing a radiation-emitting body

• US 8,723,199 B2
• Filed: 12/19/2008
• Issued: 05/13/2014
• Est. Priority Date: 12/27/2007
• Status: Active Grant

• Current Assignee: OSRAM OLED GMBH (Ams-Osram AG)
• Original Assignee: Osram Opto Semiconductors GmbH (Ams-Osram AG)
• Inventors: Eberhard, Franz, Windisch, Reiner, Walter, Robert, Ahlstedt, Magnus, Schmal, Michael
• Primary Examiner(s): Payen, Marvin
• Application Number:
  US12/811,030
• Publication Number:
  US 20110198639A1
• Time in Patent Office: 1,971 Days
• Field of Search: None
• US Class Current: 257/98
• 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 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H01L 33/22 Roughened surfaces, e.g. at the interface between epitaxial layers
• CPC Class Codes: H01L 33/46 Reflective coating, e.g. dielectric Bragg reflector

Abstract

A radiation-emitting body comprising a layer sequence, having an active layer (10) for generating electromagnetic radiation, having a reflection layer (50), which reflects the generated radiation, and having at least one intermediate layer (40) arranged between the active layer (10) and the reflection layer (50). In this case, the active layer (10) has a roughening on an interface (15) directed toward the reflection layer (50), and the reflection layer (50) is substantially planar at an interface (45) directed toward the active layer (10). Also disclosed is a method for producing a radiation-emitting body, which involves forming a layer sequence on a substrate having an active layer (10) for generating electromagnetic radiation. In this case, the method comprises roughening an interface (15) on the active layer (10), and forming at least one intermediate layer (40) and a reflection layer (50).

Claims

1. A radiation-emitting body comprising:

a layer sequence having an active layer for generating electromagnetic radiation, a reflection layer, which reflects the generated radiation, and at least one intermediate layer arranged between the active layer and the reflection layer,

wherein the active layer has a roughening on the interface directed toward the reflection layer;

wherein the reflection layer is substantially planar at an interface directed toward the active layer;

wherein the roughening comprises structure elements having a structure size;

wherein the structure size is equal to or greater than half of the wavelength of the generated electromagnetic radiation and less than or equal to double the wavelength of the generated electromagnetic radiation; and

wherein the wavelength of the generated electromagnetic radiation lies in a wavelength range between 50 nm and 1000 nm.

2. The radiation-emitting body as claimed in claim 1, wherein the intermediate layer is transmissive to the generated radiation.

3. The radiation-emitting body as claimed in claim 1, wherein the intermediate layer has a refractive index that is not equal to the refractive index of the active layer.

4. The radiation-emitting body as claimed in claim 1, wherein the roughening comprises a lateral structuring with a multiplicity of projecting structure elements.

5. The radiation-emitting body as claimed in claim 1, wherein the radiation-emitting body is a thin-film semiconductor body.

6. The radiation-emitting body as claimed in claim 1, wherein the reflection layer contains a metal or is embodied as a metallic layer.

7. The radiation-emitting body as claimed in claim 1, wherein the reflection layer directly adjoins the intermediate layer.

8. The radiation-emitting body as claimed in claim 1, wherein the reflection layer is connected to the intermediate layer in a positively locking manner.

9. The radiation-emitting body as claimed in claim 1, wherein the intermediate layer contains a dielectric material.

10. The radiation-emitting body as claimed in claim 1, wherein the intermediate layer contains an electrically conductive material.

11. The radiation-emitting body as claimed in claim 1, wherein the intermediate layer directly adjoins the active layer.

12. The radiation-emitting body as claimed in claim 1, wherein the active layer is connected to the intermediate layer in a positively locking manner.

13. A method for producing a radiation-emitting body comprising the steps of:

forming a layer sequence on a substrate, having an active layer for generating electromagnetic radiation;

roughening an interface of the active layer, wherein the roughened interface comprises structure elements having a structure size;

the structure size is equal to or greater than half of the wavelength of the generated electromagnetic radiation and less than or equal to double the wavelength of the generated electromagnetic radiation; and

the wavelength of the generated electromagnetic radiation lies in a wavelength range between 50 nm and 1000 nm;

forming at least one intermediate layer; and

forming a reflection layer.