Luminescent material, especially for LED application

• US 7,351,356 B2
• Filed: 09/23/2003
• Issued: 04/01/2008
• Est. Priority Date: 09/24/2002
• Status: Expired due to Term

• Current Assignee: OSRAM OLED GMBH (Ams-Osram AG)
• Original Assignee: Osram Opto Semiconductors GmbH (Ams-Osram AG)
• Inventors: Hintzen, Hubertus T., Li, Yuan-Qiang, Delsing, Anne Charlotte Antoinette
• Primary Examiner(s): Garrett; Dawn
• Assistant Examiner(s): Thompson; Camie S.
• Application Number:
  US10/496,707
• Publication Number:
  US 20050205845A1
• Time in Patent Office: 1,652 Days
• Field of Search: 428/690, 428/917, 252/500, 252/301.4 F, 252/301.6 F, 313/503, 313/506, 313/485, 313/486, 313/212, 313/112, 313/512, 257/98, 257/99, 257/102
• US Class Current: 252/301.40S
• CPC Class Codes: C09K 11/77347 Silicon Nitrides or Silicon Oxynitrides
• CPC Class Codes: H01L 2224/32245 the item being metallic
• 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 2224/73265 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 2924/00012 Relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• 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 33/502 Wavelength conversion materials
• CPC Class Codes: Y10S 428/917 Electroluminescent

Abstract

UV-blue excitable green luminescent material including an Eu-doped oxynitride host lattice with general composition MSi₂O₂N₂, wherein M is at least one of an alkaline earth metal chosen from the group Ca, Sr, Ba.

Claims

1. A luminescent material, a phosphor for LED-applications, which is excitable in the UV-blue region from 380 to 470 nm, characterized by a Eu-doped host lattice with general composition MSi₂O₂N₂, wherein M is at least one of an alkaline earth metal chosen from the group Ca, Sr, Ba and with a proportion of Eu from 0.1 to 30 mol % of M.

2. The UV-blue excitable luminescent material according to claim 1, wherein M is calcium in order to achieve green emission.

3. The UV-blue excitable luminescent material according to claim 1, wherein M is a mixture of at least two of these metals.

4. The UV-blue excitable luminescent material according to claim 1, wherein M comprises in addition Zn.

5. The UV-blue excitable luminescent material according to claim 1, wherein the host material is further doped with Mn.

6. A light source with a UV-blue excitable luminescent material according to claim 1.

7. A light source with a UV-blue excitable luminescent material according to claim 1, wherein the primary emitted light is blue and the UV-blue excitable luminescent material is combined with at least one other phosphor, in order to convert part of the primary emitted light into secondary emitted light of longer wavelength resulting in emitting white light.

8. A light source with a UV-blue excitable luminescent material according to claim 1, wherein the primary emitted radiation is UV and the UV-blue excitable luminescent material is combined with at least one other phosphor, in order to convert part of the primary emitted radiation into secondary emitted light of longer wavelength resulting in emitting white light.

9. The light source according to claim 6, wherein the light source is an illuminating device with at least one LED.

10. The light source according to claim 7, wherein the other phosphor is a red emitting phosphor.

11. The light source according to claim 8, wherein the other phosphor is a red emitting phosphor.

12. The UV-blue excitable luminescent material according to claim 4, wherein M comprises in addition Zn in a amount of no greater than 40 mol % but greater than 0 mol %.

13. The UV-blue excitable luminescent material according to claim 5, wherein the-amount of Mn is greater than 0 mol % but no greater than 50 mol% of the Eu doping.

14. A luminescent material, a phosphor for LED-applications, which is excitable in the UV-blue region from 380 to 470 nm, characterized by a Eu-doped host lattice with general composition M(Si₁₋

x′

+Ge_x′

)₂O₂N₂, wherein M is at least one of an alkaline earth metal chosen from the group Ca, Sr, Ba and with a proportion of Eu from 0.1 to 30 mol % of M, and x′

is greater than 0 but no greater than 1.

15. The luminescent material of claim 14 wherein x′

is no greater than 0.25.

16. A luminescent material, a phosphor for LED-applications, which is excitable in the UV-blue region from 380 to 470 nm, characterized by a Eu-doped host lattice with general composition MSi₂₋

x″

Al_x″

O_2+x″

N<sub>2−

x″</sub>

, wherein M is at least one of an alkaline earth metal chosen from the group Ca, Sr, Ba and with a proportion of Eu from 0.1 to 30 mol % of M, and x″

is greater than 0 but no greater than 0.4.