Light source with a light-emitting element

Details Light source with a light-emitting element Light source with a light-emitting element

2007-08-21

2007-08-21

Crane, Sara (Department: 2811)

Active solid-state devices (e.g., transistors, solid-state diode

Incoherent light emitter structure

C257S102000, C252S30140R

Reexamination Certificate

active

11499589

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: y Eu2+and/or (2-x-y)BaOx((Sr, Ca)O (1-a-b-c-d)SiO2aP2O5bAl2O3cB2O3dGeO2: y Eu2+. 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.

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