Light source comprising a light-emitting element
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United States of America Patent
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Oct 26, 2004
Grant Date -
May 13, 2004
app pub date -
Dec 22, 2003
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.2 aP.sub.2 O.sub.5 bAl.sub.2 O.sub.3 cB.sub.2 O.sub.3 dGeO.sub.2 :yEu.sup.2+ and/or (2-x-y)BaOx((Sr, Ca)O(1-a-b-c-d)SiO.sub.2 aP.sub.2 O.sub.5 bAl.sub.2 O.sub.3 cB.sub.2 O.sub.3 dGeO.sub.2 :yEu.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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