Illumination system comprising a radiation source and a fluorescent material

US7544309B2 · kind B2 · utility

Assignee

• KONINKLIJKE PHILIPS ELECTRONICS NV · NL

Inventors

• Thomas Juestel · Aachen, DE
• Peter Josef Schmidt · Aachen, DE
• Henning Hoeppe · Waging am See, DE
• Wolfgang Schnick · Gauting, DE
• Walter Mayr · Alsdorf, DE

Key dates

• Filing date: Dec 4, 2003
• Grant date: Jun 9, 2009
• Expiry date: Apr 6, 2025

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10H20/8512
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The invention is concerned with an illumination system, 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 an oxido-nitrido-silicate of general formula EA2-zSi5-aBaN8-aOa:Lnz, wherein 0<z≦1 and 0<a<5; comprising at least one element EA selected from the group consisting of Mg, Ca, Sr, Ba and Zn and at least one element B selected from the group consisting of Al, Ga and In, and being activated by a lanthanide selected from the group consisting of cerium, europium, terbium, praseodymium and mixtures thereof. The invention is also concerned with a phosphor, which is an oxido-nitrido-silicate of the general formula EA2-zSi5-aBaN8-aOa:Lnz, wherein 0<z≦1 and 0<a<5; comprising at least one element EA selected from the group consisting of Mg, Ca, Sr, Ba and Zn and at least one element B selected from the group consisting of Al, Ga and In, and being activated by a lanthanide selected from the group consisting of cerium, europium, terbium and mixtures thereof.