US4885211A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroluminescent device with improved cathode
Assignee: Eastman Kodak Co
•
Filing: 1987-02-11
•
Granted: 1989-12-05
•
Expires: 2007-02-11
Abstract
Abstract An electroluminescent device is disclosed comprised of, in sequence, an anode, an organic hole transporting zone, an organic electron transporting zone, and a cathode. The cathode is comprised of a layer of a plurality of metals other than alkali metals, at least one of said metals having a work function of less than 4 eV.
Inventors
- 👤 Ching W. Tang
- 👤 Steven A. VanSlyke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:43
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/26; H05B33/28; C; C09; C09K; C09K11/00; C09K11/06; H05B33/14; H10; H10K; H10K50/00; H10K50/80; H10K50/805; H10K50/82; H10K85/00; H10K85/30; H10K85/311; Y; Y10; Y10S; Y10S428/00; Y10S428/917; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31855; Y10T428/31909
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
80 words
An electroluminescent device comprising in sequence, an anode, an organic hole transporting zone, an organic electron transporting zone, and a cathode, characterized in that said cathode is comprised of a layer having a sheet resistance of less than 100 ohms per square consisting essentially of at least 50 percent magnesium and at least 0.1 percent of a metal having a work function greater than 4 eV, said metal percentages being based on total metal atoms present in said cathode layer.
Claim 2
Dependent Claim
80 words
An electroluminescent device comprising in sequence, an anode, an organic hole transporting zone, an organic electron transporting zone, and a cathode, characterized in that said cathode is comprised of a layer having a sheet resistance of less than 100 ohms per square consisting essentially of at least 50 percent magnesium and at least 0.1 percent of a metal having a work function greater than 4 eV, said metal percentages being based on total metal atoms present in said cathode layer.
Claim 3
Dependent Claim
34 words
An electroluminescent device according to claim 1 in which said organic hole transporting zone and said organic electron transporting zone together form an organic luminescent medium having a thickness of less than 1 micrometer.
Claim 4
Dependent Claim
23 words
An electroluminescent device according to claim 1 in which said organic electron transporting zone is formed of a stilbene or chelated oxinoid compound.
Claim 5
Dependent Claim
49 words
An electroluminescent device according to claim 3 in which said electron transporting zone is comprised of a vacuum vapor deposited stilbene or chelated oxinoid layer and said cathode layer is comprised of a mixture of magnesium and said high work function metal vacuum deposited on said electron transporting layer.
Claim 6
Dependent Claim
40 words
An electroluminescent device according to claim 1 in which said metal having a work function greater than 4 eV is present in said cathode layer in a concentration of from 1 to 20 percent of the total metal atoms present.
Claim 7
Dependent Claim
22 words
An electroluminescent device according to claim 1 in which said metal having a work function greater than 4 eV is a silver.
Claim 8
Dependent Claim
21 words
An electroluminescent device according to claim 1 in which said metal having a work function greater than 4 eV is aluminum.
Claim 9
Dependent Claim
21 words
An electroluminescent device according to claim 1 in which said metal having a work function greater than 4 eV is manganese.
Claim 10
Dependent Claim
21 words
An electroluminescent device according to claim 1 in which said metal having a work function greater than 4 eV is indium.
Claim 11
Dependent Claim
21 words
An electroluminescent device according to claim 1 in which said metal having a work function greater than 4 eV is tin.
Claim 12
Dependent Claim
22 words
An electroluminescent device according to claim 1 in which said metal having a work function greater than 4 eV is a copper.
Claim 13
Dependent Claim
22 words
An electroluminescent device according to claim 1 in which said metal having a work function greater than 4 eV is a gold.
Claim 14
Dependent Claim
24 words
An electroluminescent device according to claim 1 in which said metal having a work function greater than 4 eV is a Group VIII metal.
Claim 15
Dependent Claim
15 words
An electroluminescent device according to claim 13 in which said Group VIII metal is nickel.
Claim 16
Dependent Claim
19 words
An electroluminescent device according to claim 13 in which said Group VIII metal is a noble Group VIII metal.
Claim 17
Dependent Claim
16 words
An electroluminescent device according to claim 15 in which said noble Group VIII metal is palladium.
Claim 18
Dependent Claim
21 words
An electroluminescent device according to claim 1 in which said metal having a work function greater than 4 eV is chromium.
Claim 19
Dependent Claim
21 words
An electroluminescent device according to claim 1 in which said metal having a work function greater than 4 eV is antimony.
Claim 20
Dependent Claim
21 words
An electroluminescent device according to claim 1 in which said metal having a work function greater than 4 eV is tellurium.
Claim 21
Dependent Claim
99 words
An electroluminescent device comprising in sequence, an opaque anode comprised of a metal having a work function greater than 4 eV, an organic luminescent medium consisting of an organic hole transporting zone and a chelated oxinoid electron transporting zone, and a light transmissive cathode consisting essentially of a vacuum vapor deposited layer having a thickness of from 50 to 250 Angstroms and a sheet resistance of less than 100 ohms per square consisting essentially of magnesium and silver, said silver being present in a concentration of from 0.1 to 50 percent, based on total magnesium and silver atoms present.
Claim 22
Dependent Claim
99 words
An electroluminescent device comprising in sequence, an opaque anode comprised of a metal having a work function greater than 4 eV, an organic luminescent medium consisting of an organic hole transporting zone and a chelated oxinoid electron transporting zone, and a light transmissive cathode consisting essentially of a vacuum vapor deposited layer having a thickness of from 50 to 250 Angstroms and a sheet resistance of less than 100 ohms per square consisting essentially of magnesium and silver, said silver being present in a concentration of from 0.1 to 50 percent, based on total magnesium and silver atoms present.
Claim 23
Dependent Claim
32 words
An electroluminescent device according to claim 20 in which said silver is present in said cathode layer in a concentration of from 1 to 20 percent of the total metal atoms present.
Claim 24
Dependent Claim
21 words
An electroluminescent device according to claim 20 in which said organic luminescent medium has a thickness of less than 1 micrometer.
Claim 25
Dependent Claim
16 words
An electroluminescent device according to claim 20 in which said chelated oxinoid compound is aluminum trisoxine.
References Cited (Backward Citations)
US3172862A
Cited
US3173050A
Cited
US3359445A
Cited
US3382394A
Cited
US3530325A
Cited
US3621321A
Cited
US3710167A
Cited
US3772556A
Cited
US3932314A
Cited
US3995299A
Cited
US4097762A
Cited
US4165473A
Cited
US4369392A
Cited
US4356429A
Cited
US4539507A
Cited
US4675570A
Cited
US4672268A
Cited
US4671777A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-12-04 | 1993-06-05 | 1993-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-04 | 1997-06-05 | 1997-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-04 | 2001-06-05 | 2001-12-05 | $7700.00 | Window Closed / Lapsed |