Luminescent material, especially for led application

• US 20050205845A1
• Filed: 09/23/2003
• Published: 09/22/2005
• Est. Priority Date: 09/24/2002
• Status: Active Grant

• Current Assignee: OSRAM OLED GMBH (Ams-Osram AG)
• Original Assignee: Osram Opto Semiconductors GmbH (Ams-Osram AG)
• Inventors: Delsing, Anne Charlotte Antoinette, Hintzen, Hubertus T., Li, Yuan-Qiang
• Granted Patent: US 7,351,356 B2
• Time in Patent Office: Days
• US Class Current: 252/301.40R
• 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 roup Ca, Sr, Ba.

Claims

1. 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% of M.

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

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

4. UV-blue excitable luminescent material according to claim 1, wherein M comprises in addition Zn, preferably up to 40 mol- %

5. UV-blue excitable luminescent material according to claim 1, wherein Si is replaced fully or partially by Ge, preferably up to 25 mol- %.

6. UV-blue excitable luminescent material according to claim 1, wherein the host material is further doped with Mn, the amount of Mn being preferably at most up to 50% of the Eu doping.

7. UV-blue excitable luminescent material according to claim 1, wherein SiN is partially replaced by AlO, resulting in a general composition given by MSi₂₋

xAl_xO_2+xN<sub>2−

x</sub>.

8. Light source (20) with a UV-blue excitable luminescent material according to claim 1.

9. 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 other phosphors, in order to convert part of the primary emitted light into secondary emitted light of longer wavelength resulting in emitting white light.

10. 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 materials is combined with other phosphors, in order to convert part of the primary emitted radiation into secondary emitted light of longer wavelength resulting in emitting white light.

11. Light source according to claim 8, wherein the light source is an illuminating device with at least one LED.

12. Light source according to claim 9, wherein the other phosphor is a red emitting phosphor.

13. Light source according to claim 10, wherein the other phosphor is a red emitting phosphor.