US3593055A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-luminescent device
Assignee: AT&T Inc
•
Filing: 1969-04-16
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Granted: 1971-07-13
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Expires: 1989-04-16
Abstract
Abstract Increased light output results from certain design modifications in a GaAs infrared emitting diode coated with a phosphor for converting this emission to visible light. These design modifications include shape and dimensional considerations for minimizing internal reflection and absorption of infrared emission within the diode as well as dimensional and compositional considerations as applied to the coating for reducing scattering losses and minimizing internal reflection of its emission.
Inventors
- 👤 Joseph E Geusic
- 👤 Henry E D Scovil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:33
CPC Classifications
H; H10; H10H; H10H20/00; H10H20/80; H10H20/85; H10H20/851; H10H20/8511; H10H20/8512; H05; H05B; H05B33/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
16 words
Device of claim 1 in which the said junction is that of a gallium arsenide diode.
Claim 2
Dependent Claim
15 words
Device of claim 1 in which the said hemispherical region consists essentially of gallium arsenide.
Claim 3
Dependent Claim
27 words
Device of claim 2 in which the said hemisphere consists essentially of a material having an index of refraction within 10 percent of that of gallium arsenide.
Claim 4
Dependent Claim
39 words
Device of claim 1 in which the said region consists essentially of particles of phosphor material with interstitial regions substantially filled by a transparent material having a refractive index within + or - 10 percent of the said phosphor.
Claim 5
Dependent Claim
16 words
Device of claim 1 in which the outer surface of the said region is dome shaped.
Claim 6
Dependent Claim
47 words
Device of claim 1 in which the outer surface of the said region is encompassed within an addition region of an additional material substantially transparent to the said visible emission, said additional material having a refractive index within + or -10 percent of that of said region.
Claim 7
Dependent Claim
21 words
Device of claim 7 in which there is dielectric matching layer interposed between the said region and the said additional region.
Claim 8
Dependent Claim
42 words
Device of claim 1 in which a major portion of the exposed surface of the said columnar section is coated so as to be at least 95 percent reflecting with respect both to the said infrared emission and the said visible emission.
References Cited (Backward Citations)
US2861165A
Cited
US3397316A
Cited
US3304430A
Cited
US3302051A
Cited
US3462605A
Cited
US3473067A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |