Phosphor composition for a low-pressure discharge lamp with...

C - Chemistry – Metallurgy – 09 – K

Patent

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C09K 11/78 (2006.01) C09K 11/77 (2006.01) C09K 11/80 (2006.01) C09K 11/81 (2006.01)

Patent

CA 2560656

Disclosed is a fluorescent composition for a low-pressure discharge lamp having great light efficiency and a high color temperature. Said fluorescent composition contains fluorescent materials emitting in the red wavelength range from the group comprising europium-doped yttrium oxide and cerium-doped and manganese-doped gadolinium zinc magnesium pentaborate, fluorescent materials emitting in the green wavelength range from the group comprising cerium-doped and terbium-doped lanthanum phosphate and/or terbium-doped cerium magnesium aluminate and/or terbium-doped cerium magnesium pentaborate, as well as an optional fluorescent material of the type europium-doped barium magnesium aluminate, which emits in the blue wavelength range. The invention is characterized in that the fluorescent composition additionally contains at least one fluorescent material emitting in the blue or blue-green wavelength range from the group comprising manganese-doped and europium-doped manganese strontium barium magnesium aluminate or europium-doped and manganese-doped barium magnesium aluminate, europium-doped strontium aluminate, europium-doped strontium barium calcium chloroapatite, and europium-doped strontium borophosphate.

L'invention concerne une composition luminescente pour lampe à décharge basse pression à haut rendement lumineux et à haute température de couleur, ladite composition comprenant des substances luminescentes émettant dans le domaine des longueurs d'onde du rouge appartenant au groupe de l'oxyde d'yttrium dopé à l'europium et du pentaborate de gadolinium-zinc-magnésium dopé au cérium et manganèse, des substances luminescentes émettant dans le domaine des longueurs d'onde du vert, appartenant au groupe du phosphate de lanthane dopé au cérium et au terbium et/ou du cérium-aluminate de magnésium dopé au terbium et/ou du pentaborate de cérium-magnésium dopé au terbium et, éventuellement, une substance luminescente émettant dans le domaine des longueurs d'onde du bleu, du type aluminate de baryum-magnésium dopé à l'europium. La composition luminescente selon l'invention est caractérisée en ce qu'elle comprend en outre au moins une substance luminescente émettant dans le domaine de longueurs d'onde bleu ou bleu-vert, appartenant au groupe aluminate de manganèse-strontium, baryum, magnésium dopé au manganèse et à l'europium, ou aluminate de baryum-magnésium dopé à l'europium, et aluminate de manganèse et de strontium dopé à l'europium, et chloroapatite de strontium-baryum-calcium dopé à l'europium, et borophosphate de strontium dopé à l'europium.

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