Active solid-state devices (e.g. – transistors – solid-state diode – Incoherent light emitter structure – With particular semiconductor material
Reexamination Certificate
2007-03-06
2007-03-06
Crane, Sara (Department: 2811)
Active solid-state devices (e.g., transistors, solid-state diode
Incoherent light emitter structure
With particular semiconductor material
C257S089000, C257S090000
Reexamination Certificate
active
10974420
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)BaO x((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.
REFERENCES:
patent: 6252254 (2001-06-01), Soules et al.
patent: 6809347 (2004-10-01), Tasch et al.
Poort, S., et al., “Optical Properties of Eu-activation Orthosilicates and Orthophosphates,” Journal of Alloys and Compounds, vol. 260 No. 1, Sep. 12, 1997, pp. 93-97.
Kempfert Wolfgang
Pachler Peter
Roth Gundula
Starick Detlef
Tasch Stefan
Crane Sara
Mayer & Williams PC
Toyoda Gosei Co,., Ltd.
Wieczorek, Esq. Mark D.
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