Light source with a light-emitting element
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United States of America Patent
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Aug 21, 2007
Grant Date -
Nov 30, 2006
app pub date -
Aug 4, 2006
filing date -
Dec 28, 2000
priority date (Note) -
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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.sub.2aP.sub.2O.sub.5bAl.sub.2O.sub.3cB.sub.2O.sub.3dGeO.su-b.2: y Eu.sup.2+ and/or (2-x-y)BaOx((Sr, Ca)O (1-a-b-c-d)SiO.sub.2aP.sub.2O.sub.5bAl.sub.2O.sub.3cB.sub.2O.sub.3dGeO.su-b.2: y Eu.sup.2+. 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.sub.4:Eu or can contain alkaline-earth magnesium disilicate.
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