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US5531926A
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Phosphor and method of making same
Assignee: Osram Sylvania Inc
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Filing: 1995-04-20
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Granted: 1996-07-02
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Expires: 2015-04-20
Abstract
Abstract Inorganic intercalation phosphors were made by doping an inorganic intercalation compound having an atomic structure interspersed with vacant spaces with selected activator ions capable of luminescent emission when excited by ultraviolet light and/or cathode rays.
Inventors
- 👤 Ru-Yi Qi
- 👤 Ronald E. Karam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:31
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; C; C09; C09K; C09K11/00; C09K11/02; C09K11/025; C09K11/08; C09K11/0805; C09K11/59; C09K11/592; C09K11/61; C09K11/611; C09K11/64; C09K11/646; C09K11/67; C09K11/671; C09K11/77; C09K11/7728; C09K11/77342
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
38 words
A phosphor having the general formula NaMg 2 .5 Si 4 O 10 F 2 :A y , where A is an activator selected from Eu, Mn, and Tb and y ranges from about 0.02 to about 0.12.
Claim 2
Dependent Claim
38 words
A phosphor having the general formula NaMg 2 .5 Si 4 O 10 F 2 :A y , where A is an activator selected from Eu, Mn, and Tb and y ranges from about 0.02 to about 0.12.
Claim 3
Dependent Claim
19 words
The phosphor of claim 1 wherein the activator is Mn and y is from about 0.02 to about 0.10.
Claim 4
Dependent Claim
19 words
The phosphor of claim 1 wherein the activator is Tb and y is from about 0.02 to about 0.12.
Claim 5
Dependent Claim
9 words
The phosphor of claim 3 where y is 0.08.
Claim 6
Dependent Claim
38 words
A phosphor having a general formula (NaF)(NaMg 2 .5 Si 4 O 10 F 2 ) :A y where A is an activator selected from Eu, Mn, and Tb, and y ranges from about 0.02 to about 0.12.
Claim 7
Dependent Claim
38 words
A phosphor having a general formula (NaF)(NaMg 2 .5 Si 4 O 10 F 2 ) :A y where A is an activator selected from Eu, Mn, and Tb, and y ranges from about 0.02 to about 0.12.
Claim 8
Dependent Claim
19 words
The phosphor of claim 5 wherein the activator is Tb and y is from about 0.02 to about 0.10.
Claim 9
Dependent Claim
9 words
The phosphor of claim 6 wherein y is 0.08.
Claim 10
Dependent Claim
19 words
The phosphor of claim 5 wherein the activator is Mn and y is from about 0.02 to about 0.10.
Claim 11
Dependent Claim
9 words
The phosphor of claim 8 wherein y is 0.08.
Claim 12
Independent Claim
107 words
A method of making a phosphor having a general formula NaMg 2 .5 Si 4 O 10 F 2 :A y or (NaF)(NaMg 2 .5 Si 4 O 10 F 2 ):A y where A is an activator selected from Eu, Mn, Tb, and y ranges from about 0.02 to about 0.12, comprising the steps of: (a) forming a mixture of stoichiometric amounts of MgO, SiO 2 , Na 2 CO 3 , Na 2 SiF 6 and an oxide or carbonate of an activator; and (b) firing the mixture at between about 570° C. to about 1300° C. for a time sufficient to form the phosphor.
Claim 13
Independent Claim
107 words
A method of making a phosphor having a general formula NaMg 2 .5 Si 4 O 10 F 2 :A y or (NaF)(NaMg 2 .5 Si 4 O 10 F 2 ):A y where A is an activator selected from Eu, Mn, Tb, and y ranges from about 0.02 to about 0.12, comprising the steps of: (a) forming a mixture of stoichiometric amounts of MgO, SiO 2 , Na 2 CO 3 , Na 2 SiF 6 and an oxide or carbonate of an activator; and (b) firing the mixture at between about 570° C. to about 1300° C. for a time sufficient to form the phosphor.
Claim 14
Dependent Claim
12 words
The method of claim 10 wherein the mixture is fired with charcoal.
Claim 15
Dependent Claim
18 words
The method of claim 11 wherein the mixture is refired in a 4% H 2 /N 2 atmosphere.
References Cited (Backward Citations)
US3149947A
Cited
US3149982A
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FR2307863A1
Cited
US5185180A
Cited
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US5306441A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-07-02 | 2000-01-01 | 2000-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-07-02 | 2004-01-01 | 2004-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-07-02 | 2008-01-01 | 2008-07-02 | $7700.00 | Window Closed / Lapsed |