Patent US5688438A successfully refreshed from Google Patents.
US5688438A
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Preparation of high purity silicate-containing phosphors
Assignee: Micron Technology Inc
•
Filing: 1996-02-06
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Granted: 1997-11-18
•
Expires: 2016-02-06
Abstract
Abstract A method of preparing a silicate-containing phosphor is provided. The method includes combining a mixture of metal or metalloid compounds with a gaseous silicon-containing in an amount sufficient to convert the compounds to silicates, and heating the silicates under conditions effective to form a phosphor.
Inventors
- 👤 Surjit S. Chadha
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:42
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/57; C09K11/572; C09K11/574; C09K11/0838; C09K11/576; C09K11/66; C09K11/666; C09K11/67; C09K11/676; C09K11/74; C09K11/7442; C09K11/77; C09K11/7766; C09K11/77742
Claims Analysis
Total Claims: 66
Claim 1
Independent Claim
77 words
A method for preparing a silicate-containing phosphor comprising: (a) providing a mixture of oxygen-containing metal or metalloid compounds; (b) providing a gaseous silicon compound selected from the group consisting of a silicon hydride, a silicon halide, and a silicon hydride halide; (c) combining the mixture of metal or metalloid compounds with the gaseous silicon compound in an mount sufficient to convert the compounds to silicates; and (d) heating the silicates under conditions effective to form a phosphor.
Claim 2
Independent Claim
77 words
A method for preparing a silicate-containing phosphor comprising: (a) providing a mixture of oxygen-containing metal or metalloid compounds; (b) providing a gaseous silicon compound selected from the group consisting of a silicon hydride, a silicon halide, and a silicon hydride halide; (c) combining the mixture of metal or metalloid compounds with the gaseous silicon compound in an mount sufficient to convert the compounds to silicates; and (d) heating the silicates under conditions effective to form a phosphor.
Claim 3
Dependent Claim
16 words
The method of claim 1 wherein the metal or metalloid compounds are metal or metalloid salts.
Claim 4
Dependent Claim
39 words
The method of claim 2 wherein the step of combining comprises: (a) providing an aqueous solution of the mixture of metal or metalloid salts; and (b) passing the gaseous silicon compound through the aqueous solution to form the silicates.
Claim 5
Dependent Claim
33 words
The method of claim 3 wherein the aqueous solution of the mixture of metal or metalloid salts is prepared by dissolving a mixture of metal or metalloid oxides in an acidic aqueous solution.
Claim 6
Dependent Claim
32 words
The method of claim 3 wherein the step of combining further comprises a step of collecting the silicates by precipitating them out of solution prior to the step of heating the silicates.
Claim 7
Dependent Claim
26 words
The method of claim 1 wherein the conditions effective to form a phosphor include heating the mixture of silicates at a temperature of about 1000°-1500° C.
Claim 8
Dependent Claim
29 words
The method of claim 1 wherein the step of combining comprises passing the gaseous silicon compound over a mixture of the metal or metalloid compounds in the solid state.
Claim 9
Dependent Claim
18 words
The method of claim 7 wherein the gaseous silicon compound is mixed with a carrier gas and oxygen.
Claim 10
Dependent Claim
24 words
The method of claim 1 further including a step of volatilizing the mixture of metal or metalloid compounds prior to the step of combining.
Claim 11
Dependent Claim
22 words
The method of claim 9 wherein the mixture of metal or metalloid compounds is in the solid state prior to being volatilized.
Claim 12
Dependent Claim
23 words
The method of claim 9 wherein the mixture of metal or metalloid compounds is dissolved in an organic solvent prior to being volatilized.
Claim 13
Dependent Claim
23 words
The method of claim 1 wherein the silicon compound is a silicon halide or a Silicon hydride halide containing iodine, chlorine, or bromine.
Claim 14
Dependent Claim
14 words
The method of claim 12 wherein the silicon compound is gaseous at room temperature.
Claim 15
Dependent Claim
34 words
The method of claim 1 wherein the metal or metalloid compounds are compounds that include metals or metalloids capable of producing a phosphor lattice having a band gap of at least about 2.5 eV.
Claim 16
Dependent Claim
34 words
The method of claim 14 wherein the metals or metalloids include metals of Groups IA and IIA, the transition metals, the lanthanides and actinides, the metals and metalloids of Groups IIIA, IVA, and VA.
Claim 17
Dependent Claim
29 words
The method of claim 15 wherein the metals or metalloids include the transition metals, the lanthanides and actinides, and the metals and metalloids of Groups IIIA, IVA, and VA.
Claim 18
Dependent Claim
28 words
The method of claim 16 wherein the phosphor includes less than about 10 ppm of impurities selected from the group consisting of alkali metals and alkaline earth metals.
Claim 19
Dependent Claim
76 words
A phosphor prepared by a method comprising: (a) providing a mixture of oxygen-containing metal or metalloid compounds; (b) providing a gaseous silicon compound selected from the group consisting of a silicon hydride, a silicon halide, and a silicon hydride halide; (c) combining the mixture of metal or metalloid compounds with the gaseous silicon compound in an amount sufficient to convert me compounds to silicates; and (d) heating the silicates under conditions effective to form the phosphor.
Claim 20
Dependent Claim
76 words
A phosphor prepared by a method comprising: (a) providing a mixture of oxygen-containing metal or metalloid compounds; (b) providing a gaseous silicon compound selected from the group consisting of a silicon hydride, a silicon halide, and a silicon hydride halide; (c) combining the mixture of metal or metalloid compounds with the gaseous silicon compound in an amount sufficient to convert me compounds to silicates; and (d) heating the silicates under conditions effective to form the phosphor.
Claim 21
Dependent Claim
80 words
A display device comprising a phosphor prepared by a method comprising: (a) providing a mixture of oxygen-containing metal or metalloid compounds; (b) providing a gaseous silicon compound selected from the group consisting of a silicon hydride, a silicon halide, and a silicon hydride halide; (c) combining the mixture of metal or metalloid compounds with the gaseous silicon compound in an mount sufficient to convert the compounds to silicates; and (d) heating the silicates under conditions effective to form the phosphor.
Claim 22
Dependent Claim
80 words
A display device comprising a phosphor prepared by a method comprising: (a) providing a mixture of oxygen-containing metal or metalloid compounds; (b) providing a gaseous silicon compound selected from the group consisting of a silicon hydride, a silicon halide, and a silicon hydride halide; (c) combining the mixture of metal or metalloid compounds with the gaseous silicon compound in an mount sufficient to convert the compounds to silicates; and (d) heating the silicates under conditions effective to form the phosphor.
Claim 23
Dependent Claim
13 words
The display device of claim 19 which is a field emission display device.
Claim 24
Dependent Claim
31 words
The phosphor of claim 18 wherein the phosphor contains less than about 1 part per million each of impurities selected from the group consisting of alkali metals and alkaline earth metals.
Claim 25
Dependent Claim
30 words
The phosphor of claim 18 wherein the phosphor contains less than about 10 parts per million of impurities selected from the group consisting of alkali metals and alkaline earth metals.
Claim 26
Dependent Claim
32 words
The display device of claim 19 wherein the phosphor contains less than about 1 part per million each of impurities selected from the group consisting of alkali metals and alkaline earth metals.
Claim 27
Dependent Claim
31 words
The display device of claim 19 wherein the phosphor contains less than about 10 parts per million of impurities selected from the group consisting of alkali metals and alkaline earth metals.
Claim 28
Independent Claim
69 words
A method for preparing a silicate-containing phosphor comprising: (a) providing a gaseous silicon compound selected from the group consisting of a silicon hydride, a silicon halide, and a silicon hydride halide; (b) providing an aqueous solution of a mixture of metal or metalloid salts; (c) passing the gaseous silicon compound through the aqueous solution to form silicates; and (d) heating the silicates under conditions effective to form a phosphor.
Claim 29
Independent Claim
69 words
A method for preparing a silicate-containing phosphor comprising: (a) providing a gaseous silicon compound selected from the group consisting of a silicon hydride, a silicon halide, and a silicon hydride halide; (b) providing an aqueous solution of a mixture of metal or metalloid salts; (c) passing the gaseous silicon compound through the aqueous solution to form silicates; and (d) heating the silicates under conditions effective to form a phosphor.
Claim 30
Dependent Claim
33 words
The method of claim 25 wherein the aqueous solution of the mixture of metal or metalloid salts is prepared by dissolving a mixture of metal or metalloid oxides in an acidic aqueous solution.
Claim 31
Dependent Claim
37 words
The method of claim 25 wherein the step of passing the gaseous silicon compound through the aqueous solution further comprises a step of removing the silicates from the solution prior to the step of heating the silicates.
Claim 32
Independent Claim
80 words
A method for preparing a silicate-containing phosphor comprising: (a) providing a mixture of metal or metalloid compounds in the solid state; (b) providing a gaseous silicon compound selected from the group consisting of a silicon hydride, a silicon halide, and a silicon hydride halide; (c) passing the gaseous silicon compound over the mixture of metal or metalloid compounds in an amount sufficient to convert the compounds to silicates; and (d) heating the silicates under conditions effective to form a phosphor.
Claim 33
Independent Claim
80 words
A method for preparing a silicate-containing phosphor comprising: (a) providing a mixture of metal or metalloid compounds in the solid state; (b) providing a gaseous silicon compound selected from the group consisting of a silicon hydride, a silicon halide, and a silicon hydride halide; (c) passing the gaseous silicon compound over the mixture of metal or metalloid compounds in an amount sufficient to convert the compounds to silicates; and (d) heating the silicates under conditions effective to form a phosphor.
Claim 34
Dependent Claim
26 words
The method of claim 25 wherein the conditions effective to form a phosphor include heating the mixture of silicates at a temperature of about 1000°-1500° C.
Claim 35
Dependent Claim
18 words
The method of claim 25 wherein the gaseous silicon compound is mixed with a carrier gas and oxygen.
Claim 36
Dependent Claim
20 words
The method of claim 25 wherein the gaseous silicon compound is a silane optionally substituted with iodine, chlorine, or bromine.
Claim 37
Dependent Claim
28 words
The method of claim 25 wherein the phosphor includes less than about 10 ppm of impurities selected from the group consisting of alkali metals and alkaline earth metals.
Claim 38
Dependent Claim
30 words
The method of claim 25 wherein the metal or metalloid salts include metals or metalloids that produce a phosphor lattice having a band gap of at least about 2.5 eV.
Claim 39
Dependent Claim
33 words
The method of claim 25 wherein the metal or metalloid salts are selected from the group consisting of a nitrate, a carbonate, a sulfate, an oxalate, a halide, an acetate, and mixtures thereof.
Claim 40
Dependent Claim
26 words
The method of claim 28 wherein the conditions effective to form a phosphor include heating the mixture of silicates at a temperature of about 1000°-1500° C.
Claim 41
Dependent Claim
18 words
The method of claim 28 wherein the gaseous silicon compound is mixed with a carrier gas and oxygen.
Claim 42
Dependent Claim
20 words
The method of claim 28 wherein the gaseous silicon compound is a silane optionally substituted with iodine, chlorine, or bromine.
Claim 43
Dependent Claim
28 words
The method of claim 28 wherein the phosphor includes less than about 10 ppm of impurities selected from the group consisting of alkali metals and alkaline earth metals.
Claim 44
Dependent Claim
30 words
The method of claim 28 wherein the metal or metalloid compounds include metals or metalloids that produce a phosphor lattice having a band gap of at least about 2.5 eV.
Claim 45
Dependent Claim
41 words
The method of claim 28 wherein the metal or metalloid compounds are selected from the group consisting of a nitrate, a carbonate, a sulfate, an oxalate, a halide, an oxide, a sulfide, a nitride, an acetate, an acetylacetonate, and mixtures thereof.
Claim 46
Independent Claim
105 words
A method for preparing a silicate-containing phosphor comprising: (a) providing a gaseous silicon compound selected from the group consisting of a silicon hydride, a silicon halide, and a silicon hydride halide; (b) providing an aqueous solution of a mixture of metal or metalloid salts which include metals of Groups IA and IIA, the transition metals, the lanthanides and actinides, and metals and metalloids of Groups IIIA, IVA, and VA; (c) passing the gaseous silicon compound through the aqueous solution to form silicates; (d) precipitating the silicates out of solution; and (e) heating the silicates at a temperature of about 1000°-1500° C. to form a phosphor.
Claim 47
Independent Claim
105 words
A method for preparing a silicate-containing phosphor comprising: (a) providing a gaseous silicon compound selected from the group consisting of a silicon hydride, a silicon halide, and a silicon hydride halide; (b) providing an aqueous solution of a mixture of metal or metalloid salts which include metals of Groups IA and IIA, the transition metals, the lanthanides and actinides, and metals and metalloids of Groups IIIA, IVA, and VA; (c) passing the gaseous silicon compound through the aqueous solution to form silicates; (d) precipitating the silicates out of solution; and (e) heating the silicates at a temperature of about 1000°-1500° C. to form a phosphor.
Claim 48
Dependent Claim
51 words
The method of claim 41 wherein the silicate-containing phosphor is selected from the group consisting of Zn 2 SiO 4 :Mn, MgSiO 3 :Mn, CaMgSiO 4 :Ti, CaBeSiO 4 :Mn, CaSiO 3 :Pb,Mn, Zn 2 SiO 4 :Mn,As, Y 2 SiO 5 :Ce, Zn 2 SiO 4 :Ti, and mixtures thereof.
Claim 49
Independent Claim
109 words
A method for preparing a silicate-containing phosphor comprising: (a) providing a mixture of metal or metalloid compounds in the solid state which include metals of Groups IA and IIA, the transition metals, the lanthanides and actinides, and metals and metalloids of Groups IIIA, IVA, and VA; (b) providing a gaseous silicon compound selected from the group consisting of a silicon hydride, a silicon halide, and a silicon hydride halide; (c) passing the gaseous silicon compound over the mixture of metal or metalloid compounds in an amount sufficient to convert the compounds to silicates; and (d) heating the silicates at a temperature of about 1000°-1500° C. to form a phosphor.
Claim 50
Independent Claim
109 words
A method for preparing a silicate-containing phosphor comprising: (a) providing a mixture of metal or metalloid compounds in the solid state which include metals of Groups IA and IIA, the transition metals, the lanthanides and actinides, and metals and metalloids of Groups IIIA, IVA, and VA; (b) providing a gaseous silicon compound selected from the group consisting of a silicon hydride, a silicon halide, and a silicon hydride halide; (c) passing the gaseous silicon compound over the mixture of metal or metalloid compounds in an amount sufficient to convert the compounds to silicates; and (d) heating the silicates at a temperature of about 1000°-1500° C. to form a phosphor.
Claim 51
Dependent Claim
51 words
The method of claim 43 wherein the silicate-containing phosphor is selected from the group consisting of Zn 2 SiO 4 :Mn, MgSiO 3 :Mn, CaMgSiO 4 :Ti, CaBeSiO 4 :Mn, CaSiO 3 :Pb,Mn, Zn 2 SiO 4 :Mn,As, Y 2 SiO 5 :Ce, Zn 2 SiO 4 :Ti, and mixtures thereof.
Claim 52
Dependent Claim
68 words
A phosphor prepared by a method comprising: (a) providing a gaseous silicon compound selected from the group consisting of a silicon hydride, a silicon halide, and a silicon hydride halide; (b) providing an aqueous solution of a mixture of metal or metalloid salts; (c) passing the gaseous silicon compound through the aqueous solution to form silicates; and (d) heating the silicates under conditions effective to form a phosphor.
Claim 53
Dependent Claim
68 words
A phosphor prepared by a method comprising: (a) providing a gaseous silicon compound selected from the group consisting of a silicon hydride, a silicon halide, and a silicon hydride halide; (b) providing an aqueous solution of a mixture of metal or metalloid salts; (c) passing the gaseous silicon compound through the aqueous solution to form silicates; and (d) heating the silicates under conditions effective to form a phosphor.
Claim 54
Dependent Claim
49 words
(New) The phosphor of claim 45 which is selected from the group consisting of Zn 2 SiO 4 :Mn, MgSiO 3 :Mn, CaMgSiO 4 :Ti, CaBeSiO 4 :Mn, CaSiO 3 :Pb,Mn, Zn 2 SiO 4 :Mn,As, Y 2 SiO 5 :Ce, Zn 2 SiO 4 :Ti, and mixtures thereof.
Claim 55
Dependent Claim
72 words
A display device comprising a phosphor prepared by a method comprising: (a) providing a gaseous silicon compound selected from the group consisting of a silicon hydride, a silicon halide, and a silicon hydride halide; (b) providing an aqueous solution of a mixture of metal or metalloid salts; (c) passing the gaseous silicon compound through the aqueous solution to form silicates; and (d) heating the silicates under conditions effective to form a phosphor.
Claim 56
Dependent Claim
72 words
A display device comprising a phosphor prepared by a method comprising: (a) providing a gaseous silicon compound selected from the group consisting of a silicon hydride, a silicon halide, and a silicon hydride halide; (b) providing an aqueous solution of a mixture of metal or metalloid salts; (c) passing the gaseous silicon compound through the aqueous solution to form silicates; and (d) heating the silicates under conditions effective to form a phosphor.
Claim 57
Dependent Claim
13 words
The display device of claim 47 which is a field emission display device.
Claim 58
Dependent Claim
79 words
A phosphor prepared by a method comprising: (a) providing a mixture of metal or metalloid compounds in the solid state; (b) providing a gaseous silicon compound selected from the group consisting of a silicon hydride, a silicon halide, and a silicon hydride halide; (c) passing the gaseous silicon compound over the mixture of metal or metalloid compounds in an amount sufficient to convert the compounds to silicates; and (d) heating the silicates under conditions effective to form a phosphor.
Claim 59
Dependent Claim
79 words
A phosphor prepared by a method comprising: (a) providing a mixture of metal or metalloid compounds in the solid state; (b) providing a gaseous silicon compound selected from the group consisting of a silicon hydride, a silicon halide, and a silicon hydride halide; (c) passing the gaseous silicon compound over the mixture of metal or metalloid compounds in an amount sufficient to convert the compounds to silicates; and (d) heating the silicates under conditions effective to form a phosphor.
Claim 60
Dependent Claim
48 words
The phosphor of claim 49 which is selected from the group consisting of Zn 2 SiO 4 :Mn, MgSiO 3 :Mn, CaMgSiO 4 :Ti, CaBeSiO 4 :Mn, CaSiO 3 :Pb,Mn, Zn 2 SiO 4 :Mn,As, Y 2 SiO 5 :Ce, Zn 2 SiO 4 :Ti, and mixtures thereof.
Claim 61
Dependent Claim
83 words
A display device comprising a phosphor prepared by a method comprising: (a) providing a mixture of metal or metalloid compounds in the solid state; (b) providing a gaseous silicon compound selected from the group consisting of a silicon hydride, a silicon halide, and a silicon hydride halide; (c) passing the gaseous silicon compound over the mixture of metal or metalloid compounds in an amount sufficient to convert the compounds to silicates; and (d) heating the silicates under conditions effective to form a phosphor.
Claim 62
Dependent Claim
83 words
A display device comprising a phosphor prepared by a method comprising: (a) providing a mixture of metal or metalloid compounds in the solid state; (b) providing a gaseous silicon compound selected from the group consisting of a silicon hydride, a silicon halide, and a silicon hydride halide; (c) passing the gaseous silicon compound over the mixture of metal or metalloid compounds in an amount sufficient to convert the compounds to silicates; and (d) heating the silicates under conditions effective to form a phosphor.
Claim 63
Dependent Claim
13 words
The display device of claim 51 which is a field emission display device.
Claim 64
Independent Claim
107 words
A method for preparing a silicate-containing phosphor comprising: (a) providing a mixture of oxygen containing metal or metalloid salts which include metals of Groups IA and IIA, the transition metals, the lanthanides and actinides, and metals and metalloids of Groups IIIA, IVA, and VA; (b) providing a gaseous silicon compound selected from the group consisting of a silicon hydride, a silicon halide, and a silicon hydride halide; (c) combining the mixture of metal or metalloid salts with the gaseous silicon compound in an amount sufficient to convert the compounds to silicates; and (d) heating the silicates at a temperature of about 1000°-1500° C. to form a phosphor.
Claim 65
Independent Claim
107 words
A method for preparing a silicate-containing phosphor comprising: (a) providing a mixture of oxygen containing metal or metalloid salts which include metals of Groups IA and IIA, the transition metals, the lanthanides and actinides, and metals and metalloids of Groups IIIA, IVA, and VA; (b) providing a gaseous silicon compound selected from the group consisting of a silicon hydride, a silicon halide, and a silicon hydride halide; (c) combining the mixture of metal or metalloid salts with the gaseous silicon compound in an amount sufficient to convert the compounds to silicates; and (d) heating the silicates at a temperature of about 1000°-1500° C. to form a phosphor.
Claim 66
Dependent Claim
51 words
The method of claim 53 wherein the silicate-containing phosphor is selected from the group consisting of Zn 2 SiO 4 :Mn, MgSiO 3 :Mn, CaMgSiO 4 :Ti, CaBeSiO 4 :Mn, CaSiO 3 :Pb,Mn, Zn 2 SiO 4 :Mn,As, Y 2 SiO 5 :Ce, Zn 2 SiO 4 :Ti, and mixtures thereof.
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