US 6,809,347 B2 · Light source comprising a light-emitting element

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)SiO2aP2O5bAl2O3cB2O3dGeO2:yEu2+ and/or (2-x-y)BaOx((Sr, Ca)O(1-a-b-c-d)SiO2aP2O5bAl2O3cB2O3dGeO2:yEu2+. 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)O4:Eu or can contain alkaline-earth magnesium disilicate.

Claims16

Dependent claims

A light source to create white light, including a Light-Emitting Diode (LED) to emit a blue and/or ultraviolet emission, and at least one luminophore that absorbs a portion of the blue and/or ultraviolet emission and itself emits emission in another spectral region, comprising:

a luminophore, the luminophore including an alkaline-earth ortho-silicate activated with bivalent Europium of one of the following compounds or a mixture of these compounds:
a) (2-x-y)SrO·x(Bau, Cav)O·(1-a-b-c-d)SiO2·aP2O5bAl2O3cB2O3dGeO2:yEu2+
where
0≦x<1.6 0.005<y<0.5 x+y≦1.6
0≦a,b,c,d<0.5 u+v=1
applies;
b) (2-x-y)BaO·x(Sru, Cav)O·(1-a-b-c-d)SiO2·aP2O5bAl2O3cB2O3dGeO2:yEu2+
where
0.01<x<1.6 0.005<y<0.5
0≦a,b,c,d<0.5 u+v=1 x·u≧0.4
applies;
and wherein the luminophore emits emission in the yellow-green, yellow, or orange spectral regions;
and wherein the color temperature and color index of the created white light may be adjusted by a selection of parameters in the above-mentioned regions.

10 more elements

Dependencies are inferred from the claim text.

Light source comprising a light-emitting element

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Light source comprising a light-emitting element

Life of this patent

Abstract

Claims16