US3577169A
Expired / Lapsed
US
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Coexisting crystalline solution phases activated by divalent europium
Assignee: GTE Sylvania Inc
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Filing: 1968-08-05
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Granted: 1971-05-04
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Expires: 1988-08-05
Abstract
Abstract A blue-emitting Eu2 activated, fluorescent phosphor of coexisting crystalline phases of the spinel structure of MgA12O4 and the corundum structure of Alpha A12O3 is useful in fluorescent and mercury vapor lamps. The essential cations of each structure are A1, Mg and Si. In the corundum phase, the Si4 and Mg2 ions displace A13 ions, are disposed in the corundum lattice of A12O3 and are present in significant quantities, but less than the limit of mutual solubility of the Si4 and Mg2 ions in the corundum lattice. In the spinel phase, Si atoms and site vacancies displace Mg atoms in the spinel lattice and are present in significant quantities, but less than the limit of solubility of Si atoms and vacancies in the spinel lattice.
Inventors
- 👤 Thomas L Barry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:32
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7728; C09K11/7734
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
202 words
A phosphor consisting essentially, and having significant quantities, of both of the coexisting solution phases of the spinel structure of MgAl2O4 and the corundum structure of Alpha -Al2O3, the essential cations of each structure being Al, Mg and Si, the phosphor being activated by europium, said corundum phase having the formula ((Al3 )(Si4 )(Mg2 ))2 O3:Eu2 0.001-0.20 wherein the Si4 and Mg2 ions displace Al3 ions and are disposed in the corundum lattice of Al2O3 but in quantities less than the limit of mutual solubility of said ions in said corundum lattice, the Eu2 ions displacing Mg2 ions in the corundum lattice within the specified range, said spinel phase having the formula ((Mg)(Si)( ) ) A12 O4:Eu2 0.001-0.20 where represents the vacancies formed in the cation lattice to preserve electroneutrality and wherein the Si atoms and the displace Mg atoms in the spinel lattice of MgAl2O4, but in quantities less than the limit of solubility of said atoms and in said spinel lattice, the Eu2 ions displacing Mg atoms in the spinel lattice within the specified range, each of said phases being present in the phosphor in amounts sufficient to produce a level of luminescence above that produced by each phase separately.
Claim 2
Dependent Claim
202 words
A phosphor consisting essentially, and having significant quantities, of both of the coexisting solution phases of the spinel structure of MgAl2O4 and the corundum structure of Alpha -Al2O3, the essential cations of each structure being Al, Mg and Si, the phosphor being activated by europium, said corundum phase having the formula ((Al3 )(Si4 )(Mg2 ))2 O3:Eu2 0.001-0.20 wherein the Si4 and Mg2 ions displace Al3 ions and are disposed in the corundum lattice of Al2O3 but in quantities less than the limit of mutual solubility of said ions in said corundum lattice, the Eu2 ions displacing Mg2 ions in the corundum lattice within the specified range, said spinel phase having the formula ((Mg)(Si)( ) ) A12 O4:Eu2 0.001-0.20 where represents the vacancies formed in the cation lattice to preserve electroneutrality and wherein the Si atoms and the displace Mg atoms in the spinel lattice of MgAl2O4, but in quantities less than the limit of solubility of said atoms and in said spinel lattice, the Eu2 ions displacing Mg atoms in the spinel lattice within the specified range, each of said phases being present in the phosphor in amounts sufficient to produce a level of luminescence above that produced by each phase separately.
Claim 3
Dependent Claim
236 words
A fluorescent lamp including a glass envelope, electrodes disposed at each end of said ) means, to produce an electric discharge in said envelope and a luminescent layer coated upon said envelope, said layer including a phosphor consisting essentially, and having significant quantities, of both of the coexisting solution phases of the spinel structure of MgAl2O4 and the corundum structure of Alpha -Al2O3, the essential cations of each structure being A1, Mg and Si, the phosphor being activated by europium, said corundum phase having the formula ((Al3 )(Si4 )(Mg2 ))2 O3:Eu2 0.001-0.20 wherein the Si4 and Mg2 ions displace Al3 ions and are disposed in the corundum lattice of Al2O3 but in quantities less than the limit of mutual solubility of said ions in said corundum lattice, the Eu2 ions displacing Mg2 ions in the corundum lattice within the specified range, said spinel phase having the formula ((Mg)(Si)( ) Al2 O4:Eu2 0.001-0.20 WHERE represents the vacancies formed in the cation lattice to preserve electroneutrality and wherein the Si atoms and the displace Mg atoms in the spinel lattice of MgAl2O4, but in quantities less than the limit of solubility of said atoms and in said spinel lattice, the Eu2 ions displacing Mg. atoms in the spinel lattice within the specified range, each of said phases being present in the phosphor in amounts sufficient to produce a level of luminescence above that produced by each phase separately.
Claim 4
Dependent Claim
236 words
A fluorescent lamp including a glass envelope, electrodes disposed at each end of said ) means, to produce an electric discharge in said envelope and a luminescent layer coated upon said envelope, said layer including a phosphor consisting essentially, and having significant quantities, of both of the coexisting solution phases of the spinel structure of MgAl2O4 and the corundum structure of Alpha -Al2O3, the essential cations of each structure being A1, Mg and Si, the phosphor being activated by europium, said corundum phase having the formula ((Al3 )(Si4 )(Mg2 ))2 O3:Eu2 0.001-0.20 wherein the Si4 and Mg2 ions displace Al3 ions and are disposed in the corundum lattice of Al2O3 but in quantities less than the limit of mutual solubility of said ions in said corundum lattice, the Eu2 ions displacing Mg2 ions in the corundum lattice within the specified range, said spinel phase having the formula ((Mg)(Si)( ) Al2 O4:Eu2 0.001-0.20 WHERE represents the vacancies formed in the cation lattice to preserve electroneutrality and wherein the Si atoms and the displace Mg atoms in the spinel lattice of MgAl2O4, but in quantities less than the limit of solubility of said atoms and in said spinel lattice, the Eu2 ions displacing Mg. atoms in the spinel lattice within the specified range, each of said phases being present in the phosphor in amounts sufficient to produce a level of luminescence above that produced by each phase separately.
Claim 5
Dependent Claim
227 words
A mercury lamp including an arc tube surrounded by a bulbous glass jacket, said jacket having a luminescent layer coated upon said envelope, said layer including a phosphor consisting essentially, and having significant quantities, of both of the coexisting solution phases of the spinel structure of MgAl2O4 and the corundum structure Alpha -Al2O3, the essential cations of each structure being Al, Mg and Si, the phosphor being activated by europium said corundum phase having the formula ((Al3 )(Si4 )(Mg2 ))2 O3:Eu2 0.001-0.20 wherein the Si4 and Mg2 ions displace Al3 ions and are disposed in the corundum lattice of Al2O3 but in quantities less than the limit of mutual solubility of said ions in said corundum lattice, the Eu2 ions displacing Mg2 ions in the corundum lattice within the specified range, said spinel phase having the formula ((Mg)(Si)( )) Al2 O4:Eu2 0.001-where 0.20 where represents the vacancies formed in the cation lattice to preserve electroneutrality and wherein the Si atoms and the displace Mg atoms in the spinel lattice of MgAl2O4, but in quantities less than the limit of solubility of said atoms and in said spinel lattice, the Eu2 ions displacing Mg atoms in the spinel lattice within the specified range, each of said phases being present in the phosphor in amounts sufficient to produce a level of luminescence above that produced by each phase separately.
Claim 6
Dependent Claim
227 words
A mercury lamp including an arc tube surrounded by a bulbous glass jacket, said jacket having a luminescent layer coated upon said envelope, said layer including a phosphor consisting essentially, and having significant quantities, of both of the coexisting solution phases of the spinel structure of MgAl2O4 and the corundum structure Alpha -Al2O3, the essential cations of each structure being Al, Mg and Si, the phosphor being activated by europium said corundum phase having the formula ((Al3 )(Si4 )(Mg2 ))2 O3:Eu2 0.001-0.20 wherein the Si4 and Mg2 ions displace Al3 ions and are disposed in the corundum lattice of Al2O3 but in quantities less than the limit of mutual solubility of said ions in said corundum lattice, the Eu2 ions displacing Mg2 ions in the corundum lattice within the specified range, said spinel phase having the formula ((Mg)(Si)( )) Al2 O4:Eu2 0.001-where 0.20 where represents the vacancies formed in the cation lattice to preserve electroneutrality and wherein the Si atoms and the displace Mg atoms in the spinel lattice of MgAl2O4, but in quantities less than the limit of solubility of said atoms and in said spinel lattice, the Eu2 ions displacing Mg atoms in the spinel lattice within the specified range, each of said phases being present in the phosphor in amounts sufficient to produce a level of luminescence above that produced by each phase separately.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |