US4049994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light emitting diode having a short transient response time
Assignee: RCA Corp
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Filing: 1976-01-26
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Granted: 1977-09-20
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Expires: 1996-01-26
Abstract
Abstract A body of semiconductor material of an electroluminescent device is on a gallium arsenide substrate of N type conductivity. The body includes a first region of N type conductivity aluminum gallium arsenide contiguous to a surface of the substrate and a second region of silicon doped P type gallium arsenide on the first region and spaced from the substrate. The P-N junction between the first and second regions is a heterojunction, and is the only heterojunction with the second region. The second region is of a thickness, extending from the P-N junction, in the range of 50 to 200 micrometers. The electroluminescent device is capable of transient response time of 0.2 microseconds or less.
Inventors
- 👤 Ivan Ladany
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:37
CPC Classifications
H; H10; H10H; H10H20/00; H10H20/80; H10H20/81; H10H20/811; H10H20/822; H10H20/824
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
110 words
An electroluminescent device, capable of a transient response time of 0.2 microseconds or less, comprising: a body of semiconductor material having a first region of aluminum gallium arsenide of N type conductivity contiguous to a second region of gallium arsenide of P type conductivity, said second region having only silicon as the conductivity modifier, said second region having a heterojunction only with said first region, and said second region being of a thickness, extending from said heterojunction, in the range of about 50 to 200 micrometers; a substrate in contact with a surface of said first region opposite said heterojunction; and means for electrically contacting said body and said substrate.
Claim 2
Dependent Claim
110 words
An electroluminescent device, capable of a transient response time of 0.2 microseconds or less, comprising: a body of semiconductor material having a first region of aluminum gallium arsenide of N type conductivity contiguous to a second region of gallium arsenide of P type conductivity, said second region having only silicon as the conductivity modifier, said second region having a heterojunction only with said first region, and said second region being of a thickness, extending from said heterojunction, in the range of about 50 to 200 micrometers; a substrate in contact with a surface of said first region opposite said heterojunction; and means for electrically contacting said body and said substrate.
Claim 3
Dependent Claim
18 words
The electroluminescent device in accordance with claim 1 wherein said substrate is gallium arsenide of N type conductivity.
Claim 4
Dependent Claim
18 words
The electroluminescent device in accordance with claim 2 wherein said first region has approximately 10 mole % aluminum.
Claim 5
Dependent Claim
27 words
The electroluminescent device in accordance with claim 3 wherein said heterojunction is an abrupt junction with respect to the conductivity carriers of said first and second regions.
Claim 6
Dependent Claim
20 words
The electroluminescent device in accordance with claim 4 wherein the N type conductivity modifier of said first region is tellurium.
Claim 7
Dependent Claim
20 words
The electroluminescent device in accordance with claim 4 wherein the N type conductivity modifier of said first region is tin.
Claim 8
Dependent Claim
20 words
The electroluminescent device in accordance with claim 4 wherein the N type conductivity modifier of said first region is sulphur.
Claim 9
Dependent Claim
63 words
The electroluminescent device in accordance with claim 4 wherein said electrical contacting means comprises a first metallic contact on a surface of said substrate opposite said heterojunction, and a second metallic contact on a surface of said second region opposite said first metallic contact, said second metallic contact being in intimate contact with less than about 10% of the area of the surface.
Claim 10
Dependent Claim
30 words
The electroluminescent device in accordance with claim 8 wherein said first metallic contact is of a sintered gold-tin alloy and said second metallic contact is of a sintered gold-zinc alloy.
Claim 11
Dependent Claim
17 words
The electroluminescent device in accordance with claim 9 wherein said second metallic contact is circular in shape.
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) | 1980-09-19 | 1981-03-21 | 1981-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-19 | 1985-03-21 | 1985-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-19 | 1989-03-21 | 1989-09-20 | $7700.00 | Window Closed / Lapsed |