Red emitting luminescent materials

US8409472B2 · kind B2 · utility

Assignee

• KONINKLIJKE PHILIPS ELECTRONICS NV · NL

Inventors

• Peter Josef Schmidt · Aachen, DE
• Walter Mayr · Alsdorf, DE
• Joerg Meyer · Wagenfeld, DE
• Wolfgang Schnick · Gauting, DE
• Cora Sieglinde Hecht · Eindhoven, NL
• Florian Stadler · Ingolstadt, DE

Key dates

• Filing date: Apr 9, 2012
• Grant date: Apr 2, 2013
• Expiry date: Apr 9, 2032

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2235/963
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to an improved red light emitting material of the formula M1−yA1+xSi4−xN7−x−2yOx+2y:RE whereby M is selected out of the group comprising Ba, Sr, Ca, Mg or mixtures thereof, A is selected out of the group comprising Al, Ga, B or mixtures thereof, RE is selected out of the group comprising rare earth metals, Y, La, Sc or mixtures thereof and x is ≧0 and ≦1 and y is ≧0 and ≦0.2. This material is believed to crystallize in a novel structure type that comprises two individual lattice sites for rare earth metal incorporation, which leads to an improved lighting behaviour.