High luminosity phosphor blends for generating white light from near-UV/blue light-emitting devices

   
   

The present invention provides phosphor blends that are excitable by electromagnetic radiation having wavelengths in the near Uv-to-blue range (from about 315 nm to about 480 nm) to emit a visible light in a range of wavelengths from about 490 nm to about 770 nm. A phosphor blend of the present invention comprises a mixture of at least two phosphors. The first phosphor of the mixture comprises Sr.sub.2 P.sub.2 O.sub.7 :Eu.sup.2+,Mn.sup.2+ ; wherein at least one element selected from the group consisting of Ba, Zn, Ca, and Mg partially substitutes strontium. The second phosphor is at least one selected from the group consisting of Sr.sub.4 Al.sub.14 O.sub.25 :Eu.sup.2+ ; (Ba, Sr, Ca)MgAl.sub.10 O.sub.17 :Eu.sup.2+ ; (Ba, Sr, Ca)MgAl.sub.10 O.sub.17 :Eu.sup.2+,Mn.sup.2+ ; (Sr, Ba, Ca, Mg).sub.5 (PO.sub.4).sub.3 Cl:Eu.sup.2+ ; and 3.5 MgO.0.5MgF.sub.2.GeO.sub.2 :Mn.sup.4+.

La presente invenzione fornisce le miscele del fosforo che sono excitable tramite radiazione elettromagnetica che ha lunghezze d'onda nella gamma Uv-$$$-BLU vicina (da circa 315 nm a circa 480 nm) emettere una luce visibile in una gamma di lunghezze d'onda da circa 490 nm a circa 770 nm. Una miscela del fosforo di presente invenzione contiene una miscela almeno due fosfori. Il primo fosforo della miscela contiene Sr.sub.2 P.sub.2 O.sub.7:Eu.sup.2+, Mn.sup.2+; in cui almeno un elemento scelto dal Ba del gruppo, dallo Zn, dal CA e dal magnesio consistenti parzialmente sostituisce lo stronzio. Il secondo fosforo รจ almeno uno scelto dal gruppo che consiste di Sr.sub.4 Al.sub.14 O.sub.25:Eu.sup.2+; (Ba, Sr, Ca)MgAl.sub.10 O.sub.17:Eu.sup.2+; (Ba, Sr, Ca)MgAl.sub.10 O.sub.17:Eu.sup.2+, Mn.sup.2+; (Sr, Ba, CA, Mg).sub.5 (PO.sub.4).sub.3 Cl:Eu.sup.2+; e 3.5 MgO.0.5MgF.sub.2.GeO.sub.2:Mn.sup.4+.

 
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