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US 7,128,849 B2Granted
Phosphors containing boron and metals of Group IIIA and IIIB
AssigneeGeneral Electric Company
InventorsAnant Achyut Setlur, Alok Mani Srivastava, Holly Ann Comanzo, Venkatesan Manivannan
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Abstract
A phosphor comprises: (a) at least a first metal selected from the group consisting of yttrium and elements of lanthanide series other than europium; (b) at least a second metal selected from the group consisting of aluminum, gallium, indium, and scandium; (c) boron; and (d) europium. The phosphor is used in light source that comprises a UV radiation source to convert UV radiation to visible light.
Claims14
A phosphor having a formula of (D1-xEux)A3B4O12;
- wherein D is a combination of yttrium and gadolinium A is a combination of aluminum, scandium, and gallium;
- and x is in a range from about 0.001 to about 0.3.
A phosphor blend comprising:
- (a) a phosphor having a formula of (D1-xEux)A3B4O12;
- wherein D is a combination of Y and Gd, and A is a combination of Al, Sc, and Ga;
- and x is in a range from about 0.00 1 to about 0.3;
- (b) a green light-emitting phosphor;
- and (c) a blue light-emitting phosphor.
2 more elements
A method for making a phosphor, the method comprising:
- (a) mixing oxygen-containing compounds of:
- (1) at least one first metal selected from the group consisting of yttrium and elements of lanthanide series other than europium;
- (2) at least one second metal selected from the group consisting of aluminum, gallium, indium, and scandium;
- (3) boron;
- and
- (4) europium to form a mixture;
- and
- (b) heating the mixture in an oxygen-containing atmosphere at a temperature in a range from about 900° C. to about 1400° C. for a time sufficient to convert the mixture to a phosphor, wherein the phosphor comprises a material having a formula of (Dl-xEux)A3B4O12, where D is at least one metal selected from the group consisting of yttrium and elements of the lanthanide series other than europium;
- A is at least one metal selected from the group consisting of aluminum, gallium, indium, and scandium, and x is in a range from about 0.00 1 to about 0.3. and wherein the oxygen-containing compound of boron is H3BO3, and an amount of H3BO3 in the mixture is in excess of stoichiometric amount.
6 more elements
A method of preparation of a phosphor, the method comprising:
- (a) providing a first solution that comprises:
- (1) at least one compound of at least one first element selected from the group consisting of yttrium and elements of lanthanide series other than europium;
- (2) at least one compound of at least one second element selected from the group consisting of aluminum, gallium, indium and scandium;
- (3) at least one compound of boron;
- and
- (4) at least one compound of europium;
- (b) adding one second solution to the first solution to produce a precipitate comprising compounds of the first element, the second element, boron, and europium;
- the second solution comprising a base selected from the group consisting of ammonium hydroxide;
- hydroxides of at least one element selected from the group consisting of yttrium, and elements of lanthanide series;
- organic esters of carboxylic acids;
- organic amines;
- and combinations thereof and
- (c) heating the precipitate in an oxygen-containing atmosphere at a temperature in a range from about 900° C. to about 1400° C. for a time sufficient to convert the precipitate to a phosphor, wherein the phosphor comprises a material having a formula of(Dl-xEux)A3B4O12, where D is at least one of Y and a rare earth element excluding europium, and A is at least one of Al, Ga, Sc, and In, and x is in a range from about 0.00 1 to about 0.3.
10 more elements
A light source comprising:
- (a) a source of UV radiation that is located in a sealed housing;
- and
- (b) a phosphor blend disposed within the sealed housing and adapted to be excited by the UV radiation and to emit visible light, wherein the phosphor blend comprises:
- a phosphor having a formula of (Dl-xEux)A3B4O12;
- wherein D is a combination of Y and Gd, and A is a combination of Al, Sc, and Ga, and x is in a range from about 0.00 1 to about 0.3.
2 more elements
Dependencies are inferred from the claim text.