Illumination system comprising a radiation source and a fluorescent material

US7938983B2 · kind B2 · utility

Assignees

• KONINKLIJKE PHILIPS ELECTRONICS NV · NL
• Philips Lumileds Lighting Company LLC · US

Inventors

• Regina B. Mueller-Mach · San Jose, US
• Gerd O. Mueller · San Jose, US
• Jorg Meyer · Aachen, DE
• Peter Josef Schmidt · Aachen, DE
• Walter Mayr · Alsdorf, DE
• Hans-Dieter Bausen · Aachen, DE

Key dates

• Filing date: Mar 8, 2006
• Grant date: May 10, 2011
• Expiry date: Oct 22, 2029

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02B20/00
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The invention concerns an illumination system for generation of colored, especially amber or red light, comprising a radiation source and a fluorescent material comprising at least one phosphor capable of absorbing a part of light emitted by the radiation source and emitting light of wavelength different from that of the absorbed light; wherein said at least one phosphor is a amber to red emitting a rare earth metal-activated oxonitridoalumosilicate of general formula (Ca1−x−y−zSrxBayMgz)1−n(Al1−a+bBa)Si1−bN3−bOb:REn, wherein 0≦x≦1, 0≦y≦1, 0≦z≦1, 0≦a≦1, 0<b≦1 and 0.002≦n≦0.2 and RE is selected from europium(II) and cerium(III).