Patent US3525799A successfully refreshed from Google Patents.
US3636416A
Expired / Lapsed
US
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Light-emitting diode with subnanosecond response time
Assignee: Hitachi Ltd
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Filing: 1970-09-08
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Granted: 1972-01-18
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Expires: 1990-09-08
Abstract
Abstract An ultrarapid luminescent semiconductor device capable of emitting light having a short response time comprising a semiconductor mixed crystal having a direct band-gap structure and a PN-junction formed therein. The composition of the part of the crystal through which light emitted by the PN-junction is transmitted is such that the component which makes the forbidden band of the semiconductor crystal narrow is increased in its proportion gradually or stepwise in the direction of light transmission so that light emitted due to the diagonal tunnelling effect can be transmitted, but light emitted by the transition between donors and acceptors is absorbed.
Inventors
- 👤 Junichi Umeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:52
CPC Classifications
H; H10; H10H; H10H20/00; H10H20/80; H01; H01S; H01S3/00; H01S3/10; Y; Y10; Y10S; Y10S148/00; Y10S148/056; Y10S148/065; Y10S148/067; Y10S148/107
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
An injection electroluminescent semiconductor device according to claim 1, wherein the composition of said P- and N-type layers at said PN-junction is selected from the group consisting of GaAsl cPc and Gal cAlcAs where c is not less than 0.35 and not larger than 0.45.
Claim 2
Dependent Claim
23 words
An injection electroluminescent semiconductor device according to claim 2, wherein said applied voltage is higher than 1.6 v. and lower than 1.95 v.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |