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US5834053A
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Blue light emitting thiogallate phosphor
Assignee: University of California, San Diego
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Filing: 1997-03-10
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Granted: 1998-11-10
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Expires: 2017-03-10
Abstract
Abstract A crystalline blue emitting thiogallate phosphor of the formula RGa 2 S 4 :Ce x where R is selected from the group consisting of calcium, strontium, barium and zinc, and x is from about 1 to 10 atomic percent, the phosphor characterized as having a crystalline microstructure on the size order of from about 100 Å to about 10,000 Å is provided together with a process of preparing a crystalline blue emitting thiogallate phosphor by depositing on a substrate by CVD and resultant thin film electroluminescent devices including a layer of such deposited phosphor on an ordinary glass substrate.
Inventors
- 👤 Robert C. Dye
- 👤 David C. Smith
- 👤 Christopher N. King
- 👤 Richard T. Tuenge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:43
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7715; C09K11/7716; C09K11/7718; C09K11/7717
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
117 words
A process for preparation of a crystalline blue emitting thiogallate phosphor of the formula RGa 2 S 4 :Ce x where R is selected from the group consisting of calcium, strontium, barium, zinc and mixtures thereof, and x is from about 1 to 10 atomic percent, said process comprising: forming a gaseous mixture of a sulfur source and metallo-organic precursors, said metallo-organic precursors containing at least one of the metals R, Ga, and Ce and said metallo-organic precursors present in stoichiometric amounts sufficient to yield said thiogallate phosphor; and, exposing said gaseous mixture to a substrate at a temperature sufficiently high to deposit from said gaseous mixture a layer of said thiogallate phosphor having a crystalline microstructure.
Claim 2
Dependent Claim
117 words
A process for preparation of a crystalline blue emitting thiogallate phosphor of the formula RGa 2 S 4 :Ce x where R is selected from the group consisting of calcium, strontium, barium, zinc and mixtures thereof, and x is from about 1 to 10 atomic percent, said process comprising: forming a gaseous mixture of a sulfur source and metallo-organic precursors, said metallo-organic precursors containing at least one of the metals R, Ga, and Ce and said metallo-organic precursors present in stoichiometric amounts sufficient to yield said thiogallate phosphor; and, exposing said gaseous mixture to a substrate at a temperature sufficiently high to deposit from said gaseous mixture a layer of said thiogallate phosphor having a crystalline microstructure.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein R is calcium and said metallo-organic precursors include calcium bis(2,2,6,6-tetramethyl-3,5-heptandionate), gallium tris(2,2,6,6-tetramethyl-3,5-heptandionate) and cerium tetrakis(2,2,6,6-tetramethyl-3,5-heptandionate).
Claim 4
Dependent Claim
17 words
The process of claim 1 wherein said temperature is from about 400° C. to about 600° C.
Claim 5
Dependent Claim
17 words
The process of claim 1 wherein said temperature is from about 400° C. to about 600° C.
Claim 6
Dependent Claim
16 words
The process of claim 1 wherein x is from about 2 to about 8 atomic percent.
Claim 7
Dependent Claim
12 words
The process of claim 1 wherein said sulfur source is hydrogen sulfide.
References Cited (Backward Citations)
US5505986A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2001-11-09 | 2002-05-11 | 2002-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-11-09 | 2006-05-11 | 2006-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-11-09 | 2010-05-11 | 2010-11-10 | $7700.00 | Window Closed / Lapsed |