Illumination system comprising a radiation source and a fluorescent material

US7611641B2 · kind B2 · utility

Assignee

• KONINKLIJKE PHILIPS ELECTRONICS NV · NL

Inventors

• Peter Josef Schmidt · Aachen, DE
• Thomas Justel · Witten, DE
• Henning Hoppe · Brandenburg an der Havel, DE
• Wolfgang Schnick · Gauting, DE

Key dates

• Filing date: Feb 10, 2005
• Grant date: Nov 3, 2009
• Expiry date: May 9, 2026

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01L2224/8592
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

An illumination system includes a radiation source and a fluorescent material including 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. The phosphor includes a yellow red-emitting cerium-activated carbido-nitridosilicate of general formula (RE1−z)2−aEAaSi4N6+aC1−a:Cez where 0≦a<1, 0<z≦0.2, EA is at least one earth alkaline metal selected from the group of calcium, strontium and barium, and RE is a least one rare earth metal chosen from the group of yttrium, gadolinium and lutetium. The phosphor may include a red to yellow-emitting cerium-activated carbido-nitridosilicate of general formula (RE1−z)2−aEAa Si4N6+aC1−a:Cez where 0≦a<1, 0<z≦0.2, EA is at least one earth alkaline metal selected from the group of calcium, strontium and barium, and RE is a least one rare earth metal chosen from the group of yttrium, gadolinium and lutetium.