Illumination system comprising a yellow green-emitting luminescent material

US7981321B2 · kind B2 · utility

Assignee

• KONINKLIJKE PHILIPS ELECTRONICS NV · NL

Inventors

• Peter Josef Schmidt · Aachen, DE
• Volker Bachmann · Eriskirch, DE

Key dates

• Filing date: Jun 28, 2006
• Grant date: Jul 19, 2011
• Expiry date: May 31, 2028

Classification

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

Abstract

An illumination system, comprising a radiation source and a luminescent material comprising a phosphor capable of absorbing a part of light emitted by the radiation source and emitting light of a wavelength different from that of the absorbed light; wherein said phosphor is a europium-activated oxonitridoalumosilicate of general formula AE1−y−zLnySi3-xAlx−aBa O1+x−yN4−x+y:Euz, wherein AE is an alkaline earth metal selected from the group of Sr, Ca, Ba, Mg and Zn; Ln is a lanthanide metal selected from the group of La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Y; B is a trivalent metal selected from the group of boron, gallium and scandium and a 0≦a<2, 0≦x<2, 0≦y≦1, 0.001<z≦0.1 provides white or colored illumination with high efficacy. The invention also relates to a luminescent material comprising a phosphor capable of absorbing a part of light emitted by the radiation source and emitting light of a wavelength different from that of the absorbed light; wherein said phosphor is a europium-activated oxonitridoalumosilicate of general formula AE1−y−zLnySi3−xAlx−aBaO1+x−yN4−x+y: Euz, wherein AE is an alkaline earth metal selected from the group of Sr, Ca, Ba, Mg and Zn; Ln is…