US5086252A
Expired / Lapsed
US
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Thin film electroluminescence device
Assignee: Toshiba Corp
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Filing: 1989-12-18
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Granted: 1992-02-04
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Expires: 2009-12-18
Abstract
Abstract A thin film electroluminescence device is disclosed which comprises an electrode formed on a transparent substrate, one dielectric layer formed on the electrode, an emitting layer composed of a fluoride compound of the alkaline earth metal as a host material and element ions added as a luminescence center to the host material formed on the dielectric layer, the other dielectric layer formed on the emitting layer, the other electrode provided on the other dielectric layer.
Inventors
- 👤 Fusayoshi Kido
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:34
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7715; C09K11/7719; C09K11/772; C09K11/7704; C09K11/7705; C09K11/7728; C09K11/7732; C09K11/7733; H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; H05B33/22
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
105 words
A thin film electroluminescence device comprising: an emitting layer composed of a host material and lanthanide element ions added as a luminescence center in the host material, said host material being a fluoride compound of an alkaline earth metal selected from the group consisting of CaF 2 , SrF 2 and Baf 2 , the emitting layer having first and second opposite surfaces; a dielectric layer formed on each surface, or one surface, of the emitting layer; one electrode provided on an emitting layer surface or on said dielectric layer; and another electrode provided on the opposite emitting layer surface or the opposite dielectric layer.
Claim 2
Dependent Claim
105 words
A thin film electroluminescence device comprising: an emitting layer composed of a host material and lanthanide element ions added as a luminescence center in the host material, said host material being a fluoride compound of an alkaline earth metal selected from the group consisting of CaF 2 , SrF 2 and Baf 2 , the emitting layer having first and second opposite surfaces; a dielectric layer formed on each surface, or one surface, of the emitting layer; one electrode provided on an emitting layer surface or on said dielectric layer; and another electrode provided on the opposite emitting layer surface or the opposite dielectric layer.
Claim 3
Dependent Claim
19 words
The device according to claim 1, wherein the fluoride compound of said alkaline earth metal is CaF 2 .
Claim 4
Dependent Claim
19 words
The device according to claim 1, wherein the fluoride compound of said alkaline earth metal is SrF 2 .
Claim 5
Dependent Claim
15 words
The device according to claim 1, wherein said lanthanide element ions are europium (Eu) ions.
Claim 6
Dependent Claim
16 words
The device according to claim 1, wherein said dielectric layer si Ta 2 O 5 .
Claim 7
Dependent Claim
96 words
A full-color display device comprising, in combination, a blue emitting TFEL unit having an emitting layer composed of a fluoride compound of an alkaline earth metal as a host material and an element ion serving as a luminescence center, the fluoride compound of an alkaline earth metal being selected from the group consisting of CaF 2 , SrF 2 and BaF 2 , the element ion being one member selected from the group consisting of Eu 2+ , Ce 3+ , and Tm 3+ ; a green emitting TFEL unit; and a red emitting TFEL unit.
Claim 8
Dependent Claim
96 words
A full-color display device comprising, in combination, a blue emitting TFEL unit having an emitting layer composed of a fluoride compound of an alkaline earth metal as a host material and an element ion serving as a luminescence center, the fluoride compound of an alkaline earth metal being selected from the group consisting of CaF 2 , SrF 2 and BaF 2 , the element ion being one member selected from the group consisting of Eu 2+ , Ce 3+ , and Tm 3+ ; a green emitting TFEL unit; and a red emitting TFEL unit.
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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) | 1995-02-03 | 1995-08-05 | 1996-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-03 | 1999-08-05 | 2000-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-03 | 2003-08-05 | 2004-02-04 | $7700.00 | Window Closed / Lapsed |