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US4093890A
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Terbium-activated luminescent garnet material and mercury vapor discharge lamp containing the same
Assignee: US Philips Corp
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Filing: 1977-05-09
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Granted: 1978-06-06
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Expires: 1997-05-09
Abstract
Abstract Terbium-activated luminescent material with garnet crystal structure satisfying the formula Ln 3-x-p Tb p A 5-x-2y Me II x+y Me IV x+y O 12 , wherein Ln represents yttrium, gadolinium and/or lutecium, A aluminium and/or gallium, Me II magnesium, calcium, strontium and/or zinc, and Me IV silicon, germanium and/or zirconium, and wherein: 0 ≦ x ≦ 2.8 0 ≦ Y ≦ 2.0 0.4 ≦ x+y ≦ 2.8 0.02 ≦ P ≦ 1.50 x+p ≦ 3.0 is useful in low pressure mercury vapor discharge lamps.
Inventors
- 👤 Johannes Gerardus Verriet
- 👤 Josephus Hubertus Seuter Antonius Maria
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:40
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/38; H01J61/42; H01J61/44; C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766; C09K11/77744; C09K11/7775
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
111 words
A terbium-activated luminescent material with garnet crystal structure, characterized in that the luminescent material satisfies the formula Ln.sub.3-x-p Tb.sub.p A.sub.5-x-2y Me.sup.II.sub.x+y
Me.sup.IV.sub.x+y O.sub.12, wherein Ln represents at least one of the elements yttrium, gadolinium and lutecium, A is at least one of the elements aluminium and gallium, wherein upto 40 mole % of A is replaceable by scandium, Me II is at least one of the elements magnesium, calcium, strontium and zinc, and Me IV is at least one of the elements silicon, germanium and zirconium and wherein 0
≦ x ≦ 2.8
0 ≦ y ≦ 2.0
0.4 ≦ x+y ≦ 2.8
0.02 ≦ p ≦ 1.50
x+p ≦ 3.0
Claim 2
Dependent Claim
111 words
A terbium-activated luminescent material with garnet crystal structure, characterized in that the luminescent material satisfies the formula Ln.sub.3-x-p Tb.sub.p A.sub.5-x-2y Me.sup.II.sub.x+y
Me.sup.IV.sub.x+y O.sub.12, wherein Ln represents at least one of the elements yttrium, gadolinium and lutecium, A is at least one of the elements aluminium and gallium, wherein upto 40 mole % of A is replaceable by scandium, Me II is at least one of the elements magnesium, calcium, strontium and zinc, and Me IV is at least one of the elements silicon, germanium and zirconium and wherein 0
≦ x ≦ 2.8
0 ≦ y ≦ 2.0
0.4 ≦ x+y ≦ 2.8
0.02 ≦ p ≦ 1.50
x+p ≦ 3.0
Claim 3
Dependent Claim
15 words
A luminescent material as claimed in claim 1, characterized in that Ln is mainly yttrium.
Claim 4
Dependent Claim
15 words
A luminescent material as claimed in claim 2, characterized in that A is mainly aluminium.
Claim 5
Dependent Claim
16 words
A luminescent material as claimed in claim 2, characterized in that Me II is mainly magnesium.
Claim 6
Dependent Claim
16 words
A luminescent material as claimed in claim 2, characterized in that Me IV is mainly silicon.
Claim 7
Dependent Claim
29 words
A luminescent material as claimed in claim 1 characterized in that 0.5 ≦ x ≦ 1.7
0 ≦ y ≦ 1.5
x+y ≦ 2.25
0.05 ≦ p ≦ 0.75.
Claim 8
Dependent Claim
29 words
A luminescent material as claimed in claim 6, characterized in that 0.75 ≦ x ≦ 1.25
0 ≦ y ≦ 0.75
x+y ≦ 1.75
0.10 ≦ p ≦ 0.50
Claim 9
Dependent Claim
16 words
A low-pressure mercury vapor discharge lamp provided with a luminescent material as claimed in claim 1.
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) | 1981-06-05 | 1981-12-05 | 1982-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-05 | 1985-12-05 | 1986-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-05 | 1989-12-05 | 1990-06-06 | $7700.00 | Window Closed / Lapsed |