US4249108A
Expired / Lapsed
US
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LaMg Aluminate phosphors activated by europium and lamps incorporating same
Assignee: Osram Sylvania Inc
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Filing: 1979-11-30
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Granted: 1981-02-03
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Expires: 1999-11-30
Abstract
Abstract A blue emitting La Mg aluminate phosphor activated by Eu and having a multiphase structure, exhibits improved brightness over prior art single phase compositions, and also exhibits high maintenance, making such phosphor useful either alone or in combination with other phosphors in fluorescent lamps.
Inventors
- 👤 Robert W. Wolfe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:43
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7783; C09K11/7792
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
84 words
A blue-emitting divalent europium activated lanthanum magnesium aluminate luminescent phosphor composition exhibiting a multiphase structure of either magneto plumbite and alpha alumina phases or magneto plumbite, alpha alumina and spinel phases and having the molar formula of La.sub.x Mg.sub.y Al.sub.11 O.sub.16.5+y+( 3x/2) where x lies between 0.351 and 0.750 and y lies between 0.351 and 0.750; said phosphor composition exhibiting a greater brightness than the corresponding divalent europium activated lanthanum magnesium aluminate luminescent phosphor composition having the molar formula LaMgA 11 O 19 .
Claim 2
Dependent Claim
84 words
A blue-emitting divalent europium activated lanthanum magnesium aluminate luminescent phosphor composition exhibiting a multiphase structure of either magneto plumbite and alpha alumina phases or magneto plumbite, alpha alumina and spinel phases and having the molar formula of La.sub.x Mg.sub.y Al.sub.11 O.sub.16.5+y+( 3x/2) where x lies between 0.351 and 0.750 and y lies between 0.351 and 0.750; said phosphor composition exhibiting a greater brightness than the corresponding divalent europium activated lanthanum magnesium aluminate luminescent phosphor composition having the molar formula LaMgA 11 O 19 .
Claim 3
Dependent Claim
24 words
The composition of claim 1 wherein the europium activator is present in the amount of about 0.02 to 0.20 moles per mole of host.
Claim 4
Dependent Claim
25 words
The composition of claim 2 wherein the europium activator is present in the amount of from 0.025 to about 0.125 moles per mole of host.
Claim 5
Dependent Claim
11 words
A fluorescent lamp including the luminescent phosphor composition of claim 1.
References Cited (Backward Citations)
NL7214862A
Cited
US4161457A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-03 | 1984-08-04 | 1985-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-03 | 1988-08-04 | 1989-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-03 | 1992-08-04 | 1993-02-03 | $7700.00 | Window Closed / Lapsed |