Patent US4209045A successfully refreshed from Google Patents.
Patent US5637950A successfully refreshed from Google Patents.
US5637950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Field emission devices employing enhanced diamond field emitters
Assignee: Nokia of America Corp
•
Filing: 1994-10-31
•
Granted: 1997-06-10
•
Expires: 2014-10-31
Abstract
Abstract Applicants have discovered methods for making, treating and using diamonds which substantially enhance their capability for low voltage emission. Specifically, applicants have discovered that defect-rich diamonds--diamonds grown or treated to increase the concentration of defects--have enhanced properties of low voltage emission. Defect-rich diamonds are characterized in Raman spectroscopy by a diamond peak at 1332 cm -1 broadened by a full width at half maximum ΔK in the range 5-15 cm -1 (and preferably 7-11 cm -1 ). Such defect-rich diamonds can emit electron current densities of 0.1 mA/mm 2 or more at a low applied field of 25 V/μm or less. Particularly advantageous structures use such diamonds in an array of islands or particles each less than 10 μm in diameter at fields of 15 V/μm or less.
Inventors
- 👤 Sungho Jin
- 👤 Gregory P. Kochanski
- 👤 Lawrence Seibles
- 👤 Wei Zhu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:50
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/30; H01J1/304; H01J1/3042; H01J9/00; H01J9/24; H01J2201/00; H01J2201/30; H01J2201/304; H01J2201/30403; H01J2201/30446; H01J2201/30453; H01J2201/30457; H01J2329/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
81 words
A diamond field emitter for emitting electrons at low voltage comprising: a substrate; disposed on said substrate, a diamond material characterized by a diamond peak at 1332 cm -1 in Raman spectroscopy broadened to a full width at half maximum in the range 5-15 cm -1 , said diamond material capable of emitting electrons in a current density of at least 0.1 mA/mm 2 at an applied field of 25 V/μm or less; and means for electrically contacting said field emitter.
Claim 2
Dependent Claim
81 words
A diamond field emitter for emitting electrons at low voltage comprising: a substrate; disposed on said substrate, a diamond material characterized by a diamond peak at 1332 cm -1 in Raman spectroscopy broadened to a full width at half maximum in the range 5-15 cm -1 , said diamond material capable of emitting electrons in a current density of at least 0.1 mA/mm 2 at an applied field of 25 V/μm or less; and means for electrically contacting said field emitter.
Claim 3
Dependent Claim
22 words
A diamond emitter according to claim 1 wherein said full width at half maximum is in the range 7-11 cm -1 .
Claim 4
Dependent Claim
28 words
A diamond emitter according to claim 1 wherein said diamond material is in the form of a plurality of islands or particles having diameters less than 10 μm.
Claim 5
Dependent Claim
28 words
A diamond emitter according to claim 1 wherein said diamond material is in the form of a plurality of islands or particles having diameters less than 2 μm.
Claim 6
Dependent Claim
26 words
A diamond emitter according to claim 1 wherein said substrate has a diamond nucleation site density in the range 10 7 -10 10 /cm 2 .
Claim 7
Dependent Claim
97 words
In a field emission device comprising a cathode including at least one field emitter, an anode spaced from said cathode and means for applying a voltage between said anode and said cathode for inducing emission of electrons, the improvement wherein: said field emitter comprises diamond material characterized by a diamond peak at 1332 cm -1 in Raman spectroscopy broadened to a full width at half maximum in the range 5-15 cm -1 , said diamond material emitting electrons in a current density of at least 0.1 mA/mm 2 at an applied field of 25 V/μm or less.
Claim 8
Dependent Claim
97 words
In a field emission device comprising a cathode including at least one field emitter, an anode spaced from said cathode and means for applying a voltage between said anode and said cathode for inducing emission of electrons, the improvement wherein: said field emitter comprises diamond material characterized by a diamond peak at 1332 cm -1 in Raman spectroscopy broadened to a full width at half maximum in the range 5-15 cm -1 , said diamond material emitting electrons in a current density of at least 0.1 mA/mm 2 at an applied field of 25 V/μm or less.
References Cited (Backward Citations)
US4940916B1
Cited
US4940916A
Cited
US5370912A
Cited
US5104634A
Cited
US5075094A
Cited
US5129850A
Cited
US5138237A
Cited
US5199918A
Cited
US5397428A
Cited
US5283500A
Cited
US5278475A
Cited
US5387443A
Cited
EP0609532A1
Cited
WO1994028571A1
Cited
WO1995022168A1
Cited
WO1995022169A1
Cited
EP0675519A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-06-09 | 2000-12-09 | 2001-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-06-09 | 2004-12-09 | 2005-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-06-09 | 2008-12-09 | 2009-06-10 | $7700.00 | Window Closed / Lapsed |