The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 26, 2004
Filed:
Dec. 22, 2003
Stefan Tasch, Jennersdorf, AT;
Peter Pachler, Graz, AT;
Gundula Roth, Levenhagen, DE;
Walter Tews, Greifswald, DE;
Wolfgang Kempfert, Bad Liebenstein, DE;
Detlef Starick, Bad Liebenstein, DE;
Other;
Abstract
The invention relates to a light source comprising a light-emitting element, which emits light in a first spectral region, and comprising a luminophore, which comes from the group of alkaline-earth orthosilicates and which absorbs a portion of the light emitted by the light source and emits light in another spectral region. According to the invention, the luminophore is an alkaline-earth orthosilicate, which is activated with bivalent europium and whose composition consists of: (2-x-y)SrOx(Ba, Ca)O(1-a-b-c-d)SiO aP O bAl O cB O dGeO :yEu and/or (2-x-y)BaOx((Sr, Ca)O(1-a-b-c-d)SiO aP O bAl O cB O dGeO :yEu . The desired color (color temperature) can be easily adjusted by using a luminophore of the aforementioned type. The light source can contain an additional luminophore selected from the group of alkaline-earth aluminates, activated with bivalent europium and/or manganese, and/or can contain an additional red-emitting luminophore selected from the group Y(V, P, Si)O :Eu or can contain alkaline-earth magnesium disilicate.