Illumination system comprising a radiation source and fluorescent material

US7700002B2 · kind B2 · utility

Assignees

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

Inventors

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

Key dates

• Filing date: May 23, 2005
• Grant date: Apr 20, 2010
• Expiry date: Jul 9, 2027

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K11/77348
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The invention concerns an illumination system comprising a radiation source and a fluorescent material comprising at least one phosphor capable of absorbing part of the light emitted by the radiation source and emitting light of a wavelength different from that of the absorbed light; wherein said at least one phosphor is a yellow to red-emitting europium(II) activated halogeno-oxonitridosilicate of the general formula EaxSiyN2/3X+4/3y:EuzOaXb, wherein 1≦x≦2; 3≦y≦7; 0.001≦z≦0.09, 0.005<a≦5 0.05, 0.01<b≦0.3, EA is at least one earth alkaline metal chosen from the group of calcium, barium and strontium and X is at least one halogen chosen from the group of fluorine, chlorine, bromine and iodine. The invention is also concerned with a red to yellow-emitting europium(II)-activated halogeno-oxonitridosilicate of the general formula EaxSiyN2/3x+4/3y:EuzOaXb, wherein 1≦x≦2; 3≦y≦≦7; 0.001<z≦0.09, 0.005<a≦0.05, 0.01<b≦0.3, EA is at least one earth alkaline metal chosen from the group of calcium, barium and strontium and X is at least one halogen chosen from the group of fluorine, chlorine, bromine and iodine, and a method of manufacturing same.