US4027192A
Expired / Lapsed
US
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Electroluminescent device comprising electroluminescent layer containing indium oxide and/or tin oxide
Assignee: RCA Corp
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Filing: 1975-07-18
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Granted: 1977-05-31
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Expires: 1995-07-18
Abstract
Abstract The device comprises an electroluminescent layer and means for exciting the electroluminescent layer to luminescence with an electric field. The electroluminescent layer comprises a cathodoluminescent phosphor normally having a bulk resistivity greater than 10 11 ohm-centimeters containing a sufficient quantity of indium oxide and/or tin oxide therein to produce a bulk resistivity of less than 10 10 ohm-centimeters in the electroluminescent layer. The preferred electroluminescent layers are red emitting solid solutions of yttrium oxide, europium oxide, and indium oxide which are prepared by radio frequency sputtering.
Inventors
- 👤 Joseph John Hanak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:07
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766; C09K11/7767; C09K11/7769
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
80 words
An electroluminescent device comprising (a) a homogeneous electroluminescent layer consisting essentially of a solid solution of a cathodoluminescent phosphor normally having a bulk electrical resistivity greater than 10 11 ohm-centimeters and a quantity of at least one member of the group consisting of indium oxide and tin oxide, said quantity being effective to reduce the bulk resistivity of said layer to less than 10 10 ohm-centimeters, and (b) means for exciting said electroluminescent layer to luminescence with an electric field.
Claim 2
Dependent Claim
80 words
An electroluminescent device comprising (a) a homogeneous electroluminescent layer consisting essentially of a solid solution of a cathodoluminescent phosphor normally having a bulk electrical resistivity greater than 10 11 ohm-centimeters and a quantity of at least one member of the group consisting of indium oxide and tin oxide, said quantity being effective to reduce the bulk resistivity of said layer to less than 10 10 ohm-centimeters, and (b) means for exciting said electroluminescent layer to luminescence with an electric field.
Claim 3
Dependent Claim
14 words
The device defined in claim 1 wherein said phosphor has only indium oxide therein.
Claim 4
Dependent Claim
14 words
The device defined in claim 1 wherein said phosphor has only tin oxide therein.
Claim 5
Dependent Claim
48 words
The device defined in claim 1 wherein said means includes a first transparent electrode on one side of said layer, a resistive layer for limiting the maximum current flow through said device contacting the other side of said electroluminescent layer and a second electrode contacting said resistive layer.
Claim 6
Dependent Claim
18 words
The device defined in claim 1 wherein said electroluminescent layer is produced by a radio frequency sputtering method.
Claim 7
Dependent Claim
43 words
The device defined in claim 1 wherein said solid solution contains, per 100 mol parts of solution, about 11 to 92 mol parts of yttrium oxide, 7 to 75 mol parts of indium oxide and 1 to 14 mol parts or europium oxide.
Claim 8
Dependent Claim
84 words
An electroluminescent device comprising (a) a homogeneous electroluminescent layer consisting essentially of a solid solution of yttrium oxide, indium oxide, and europium oxide said solid solution containing, per 100 mol parts of solution, about 25 to 91 mol parts of yttrium oxide, 7 to 65 mol parts of indium oxide, and 2 to 10 mol parts of europium oxide. said layer having a bulk resistivity of less than 10 10 ohm-centimeters and (b) means for exciting said layer to luminescence with an electric field.
Claim 9
Dependent Claim
84 words
An electroluminescent device comprising (a) a homogeneous electroluminescent layer consisting essentially of a solid solution of yttrium oxide, indium oxide, and europium oxide said solid solution containing, per 100 mol parts of solution, about 25 to 91 mol parts of yttrium oxide, 7 to 65 mol parts of indium oxide, and 2 to 10 mol parts of europium oxide. said layer having a bulk resistivity of less than 10 10 ohm-centimeters and (b) means for exciting said layer to luminescence with an electric field.
Claim 10
Dependent Claim
43 words
The device defined in claim 7 wherein said solid solution contains, per 100 mol parts of solution about 25 to 83 mol parts of yttrium oxide, 15 to 65 mol parts of indium oxide and 2 to 10 mol parts of europium oxide.
Claim 11
Dependent Claim
43 words
The device defined in claim 7 wherein said solid solution contains, per 100 mol parts of solution, about 60 to 91 mols parts of yttrium oxide, 7 to 30 mol parts of indium oxide and 2 to 10 mol parts of europium oxide.
Claim 12
Dependent Claim
71 words
The device defined in claim 9 wherein said solid solution contains, per 100 mol parts of solution, about 76 mol parts of yttrium oxide, about 15 mol parts of indium oxide and about 9 mol parts of europium oxide, an insulating layer adjacent to both sides of said solid solution layer and said electric field is an ac electric field with frequencies in the range of about 1 to 5 kilohertz.
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) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |