US5602445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blue-violet phosphor for use in electroluminescent flat panel displays
Assignee: Oregon Health & Science University
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Filing: 1995-05-12
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Granted: 1997-02-11
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Expires: 2015-05-12
Abstract
Abstract A bright, short wavelength blue-violet phosphor for electroluminescent displays comprises an alkaline-based halide as a host material and a rare earth as a dopant. The host alkaline chloride can be chosen from the group II alkaline elements, particularly strontium chloride (SrCl 2 ) or calcium chloride (CaCl 2 ), which, with a europium (Eu) or cerium (Ce) rare earth dopant, electroluminesces at a peak wavelength of 404 and 367 nanometers (nm) respectively. The resulting emissions have CIE chromaticity coordinates which lie at the boundary of the visible range for the human eye thereby allowing a greater range of colors for full color flat panel electroluminescent (FPEL) displays.
Inventors
- 👤 Rajendra Solanki
- 👤 Weiran Kong
- 👤 Shafqat Ahmed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:34
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7715; C09K11/7719; C09K11/772; C09K11/7728; C09K11/7732; C09K11/7733
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
71 words
A thin film electroluminescent (TFEL) element in a display comprising a transparent substrate, a transparent conducting film defining a first electrode, a first dielectric layer, a luminescent layer, and a second dielectric layer, each layer formed on top of the other on the substrate, the second dielectric layer being provided with a second electrode, the luminescent layer including: a strontium chloride (SrCl 2 ) host layer; and a rare earth dopant.
Claim 2
Dependent Claim
71 words
A thin film electroluminescent (TFEL) element in a display comprising a transparent substrate, a transparent conducting film defining a first electrode, a first dielectric layer, a luminescent layer, and a second dielectric layer, each layer formed on top of the other on the substrate, the second dielectric layer being provided with a second electrode, the luminescent layer including: a strontium chloride (SrCl 2 ) host layer; and a rare earth dopant.
Claim 3
Dependent Claim
29 words
The EL element of claim 1, wherein the rare earth dopant is selected from a group consisting of divalent europium (Eu 2+ ) and trivalent cerium (Ce 3+ ).
Claim 4
Dependent Claim
79 words
A thin film electroluminescent (TFEL) device comprising a front electrode set deposited on a transparent substrate, a rear electrode set, and a thin film laminate sandwiched between said front and rear electrode sets, said thin film laminate including at least a pair of insulating layers sandwiching an alkaline halide phosphor layer having the chemical formula: MCl.sub.2 :RE where M is selected from the group consisting of calcium, strontium, zinc, and barium, and RE comprises a rare earth activator dopant.
Claim 5
Dependent Claim
79 words
A thin film electroluminescent (TFEL) device comprising a front electrode set deposited on a transparent substrate, a rear electrode set, and a thin film laminate sandwiched between said front and rear electrode sets, said thin film laminate including at least a pair of insulating layers sandwiching an alkaline halide phosphor layer having the chemical formula: MCl.sub.2 :RE where M is selected from the group consisting of calcium, strontium, zinc, and barium, and RE comprises a rare earth activator dopant.
Claim 6
Dependent Claim
9 words
The device of claim 3 where M is strontium.
Claim 7
Dependent Claim
9 words
The device of claim 3 where M is calcium.
Claim 8
Dependent Claim
9 words
The device of claim 3 where M is barium.
Claim 9
Dependent Claim
9 words
The device of claim 3 where M is zinc.
Claim 10
Dependent Claim
9 words
The device of claim 3 where RE is europium.
Claim 11
Dependent Claim
9 words
The device of claim 3 where RE is cerium.
Claim 12
Dependent Claim
9 words
The device of claim 3 where RE is samarium.
Claim 13
Dependent Claim
27 words
The device of claim 3 further including a pair of protective film layers sandwiching the alkaline halide phosphor layer and interposed between the pair of insulating layers.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-02-11 | 2000-08-12 | 2001-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-02-11 | 2004-08-12 | 2005-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-02-11 | 2008-08-12 | 2009-02-11 | $7700.00 | Window Closed / Lapsed |