US4314910A
Expired / Lapsed
US
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Luminiscent materials
Assignee: Johnson Matthey PLC
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Filing: 1980-01-20
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Granted: 1982-02-09
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Expires: 2000-01-20
Abstract
Abstract This invention relates to luminescent materials, especially to such materials of the type comprising cerium activated yttrium aluminium garnets which may be used in cathode-ray tubes for flying spot scanning devices. In more detail the luminescent material of the invention comprises a yttrium-scandium-gallium-aluminium garnet activated by trivalent cerium and having the formula: Y.sub.3-x Ce.sub.xSc.sbsb.y Ga.sub.z Al(.sub.5-(y+z)).sup.O 12 in which 0.02≦x≦0.1, 0.5≦y≦2 and 1≦z≦3, provided that (y+z) is less than 5.
Inventors
- 👤 Roderick G. L. Barnes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:00
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766; C09K11/7774
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
102 words
A luminescent material comprising an yttrium-scandium-gallium-aluminum garnet activated by trivalent cerium and having the formula: Y.sub.3-x Ce.sub.x Sc.sub.y Ga.sub.z Al.sub.(5-(y+z)) O.sub.12 in which 0.02≦x≦0.1, 0.5≦y≦2 and 1≦z≦3, provided that (y+z) is less than 5, said material being capable, under cathode ray excitation, of emitting with high efficiency over a broad wavelength band peaking in the green or blue/green region between about 500 and 550 nm and having a decay time of less than 10 -6 seconds, said material exhibiting brighter luminescense on cathode ray excitation than the corresponding yttrium-gallium-aluminum garnet activated by trivalent cerium in which the scandium is replaced by gallium.
Claim 2
Dependent Claim
102 words
A luminescent material comprising an yttrium-scandium-gallium-aluminum garnet activated by trivalent cerium and having the formula: Y.sub.3-x Ce.sub.x Sc.sub.y Ga.sub.z Al.sub.(5-(y+z)) O.sub.12 in which 0.02≦x≦0.1, 0.5≦y≦2 and 1≦z≦3, provided that (y+z) is less than 5, said material being capable, under cathode ray excitation, of emitting with high efficiency over a broad wavelength band peaking in the green or blue/green region between about 500 and 550 nm and having a decay time of less than 10 -6 seconds, said material exhibiting brighter luminescense on cathode ray excitation than the corresponding yttrium-gallium-aluminum garnet activated by trivalent cerium in which the scandium is replaced by gallium.
Claim 3
Dependent Claim
11 words
A luminescent material as claimed in claim 1, in which 0.05≦x≦0.1.
Claim 4
Dependent Claim
11 words
A luminescent material as claimed in claim 1, in which x=0.08.
Claim 5
Dependent Claim
15 words
A luminescent material according to claim 1 having the formula: Y.sub.2.92 Ce.sub.0.08 Sc.sub.1.5 Ga.sub.2.5 AlO.sub.12
Claim 6
Dependent Claim
15 words
A luminescent material according to claim 1 having the formula: Y.sub.2.92 Ce.sub.0.08 Sc.sub.0.75 GaAl.sub.3.25 O.sub.12
Claim 7
Dependent Claim
14 words
A luminescent material according to claim 1 having the formula: Y.sub.2.92 Ce.sub.0.08 ScGa.sub.3 AlO.sub.12
Claim 8
Dependent Claim
24 words
A luminescent material according to claim 1 having the formula: Y.sub.2.92 Ce.sub.0.08 Sc.sub.2 Ga.sub.2 AlO.sub.12 said material emitting a band peaking at 517 nm.
Claim 9
Dependent Claim
16 words
A luminescent material according to claim 1 having the formula: Y.sub.2.92 Ce.sub.0.08 Sc.sub.0.5 Ga.sub.1.5 Al.sub.3 O.sub.12
Claim 10
Dependent Claim
24 words
A luminescent material according to claim 1 having the formula: Y.sub.2.92 Ce.sub.0.08 Sc.sub.2 GaAl.sub.2 O.sub.12, said material emitting a band peaking at 527 nm.
References Cited (Backward Citations)
DE2739437A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-02-08 | 1985-08-10 | 1986-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-08 | 1989-08-10 | 1990-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-08 | 1993-08-10 | 1994-02-09 | $7700.00 | Window Closed / Lapsed |