US5776623A
Expired / Lapsed
US
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Transparent electron-injecting electrode for use in an electroluminescent device
Assignee: Global OLED Technology LLC
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Filing: 1996-07-29
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Granted: 1998-07-07
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Expires: 2016-07-29
Abstract
Abstract An electroluminescent device containing a transparent electron-injecting electrode is disclosed. The electrode includes a thin nonconductive layer contacting the electroluminescent layer, a conductive transparent overcoat layer, and the thickness of the nonconductive layer being selected so that the bilayer acts as an electron injecting contact, the bilayer providing stability against atmospheric corrosion.
Inventors
- 👤 Liang-Sun Hung
- 👤 Ching Wan Tang
- 👤 Joseph Kuru Madathil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:24
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; H05B33/26; H05B33/28; H10; H10K; H10K50/00; H10K50/10; H10K50/17; H10K50/171; H10K50/80; H10K50/805; H10K50/82; H10K50/828; H10K2102/00; H10K2102/301; H10K2102/302; H10K2102/3023; H10K2102/3026; Y; Y10; Y10S; Y10S428/00; Y10S428/917; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24917; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
53 words
An electroluminescent device containing a transparent electron-injecting electrode, the electrode comprising: a) a thin nonconductive layer contacting an electroluminescent layer, b) a conductive transparent overcoat layer; and c) the thickness of the nonconductive layer being selected so that the bilayer acts as an electron injecting contact, the bilayer providing stability against atmospheric corrosion.
Claim 2
Dependent Claim
53 words
An electroluminescent device containing a transparent electron-injecting electrode, the electrode comprising: a) a thin nonconductive layer contacting an electroluminescent layer, b) a conductive transparent overcoat layer; and c) the thickness of the nonconductive layer being selected so that the bilayer acts as an electron injecting contact, the bilayer providing stability against atmospheric corrosion.
Claim 3
Dependent Claim
21 words
The electrode of claim 1 wherein the thickness of the nonconductive layer is in the range of 0.3 to 5.0 nm.
Claim 4
Dependent Claim
19 words
The electrode of claim 1 wherein the nonconductive materials have a low electron affinity or a strong dipole character.
Claim 5
Dependent Claim
28 words
The electrode of claim 3 wherein said the nonconductive layer is selected from an alkali fluoride, an alkaline earth fluoride, an alkali oxide, or an alkaline earth oxide.
Claim 6
Dependent Claim
21 words
The electrode of claim 4 wherein said alkali fluoride includes lithium fluoride, sodium fluoride, potassium fluoride, rubidium fluoride, or cesium fluoride.
Claim 7
Dependent Claim
20 words
The electrode of claim 4 wherein said alkaline earth fluoride includes magnesium fluoride, calcium fluoride, strontium fluoride, or barium fluoride.
Claim 8
Dependent Claim
21 words
The electrode of claim 4 wherein said alkali oxide includes lithium oxide, sodium oxide, potassium oxide, rubidium oxide, or cesium oxide.
Claim 9
Dependent Claim
20 words
The electrode of claim 4 wherein said alkaline earth oxide includes magnesium oxide, calcium oxide, strontium oxide, or barium oxide.
Claim 10
Dependent Claim
23 words
The electrode of claim 1 wherein said conductive transparent overcoat layer can be selected from the group consisting of oxides, nitrides and sulfides.
Claim 11
Dependent Claim
15 words
The electrode of claim 9 wherein the nitride is GaN and the sulfide is ZnS.
Claim 12
Dependent Claim
23 words
The electrode of claim 5 wherein suitable metal oxides include indium-tin-oxide, aluminum- or indium-doped zinc oxide, tin oxide, magnesium-indium-oxide, nickel-tungsten oxide, or cadmium-tin-oxide.
Claim 13
Dependent Claim
64 words
An electroluminescent device comprising: a) a single crystal semiconductor substrate; b) a hole-injecting electrode having a work function with a value greater than 4.1 eV; c) an organic electroluminescent layer; and d) a transparent electron-injecting electrode including a nonconductive layer on the organic layer and a conductive overcoat layer, the thickness of the nonconductive layer being in a range of 0.3 to 5.0 nm.
Claim 14
Dependent Claim
64 words
An electroluminescent device comprising: a) a single crystal semiconductor substrate; b) a hole-injecting electrode having a work function with a value greater than 4.1 eV; c) an organic electroluminescent layer; and d) a transparent electron-injecting electrode including a nonconductive layer on the organic layer and a conductive overcoat layer, the thickness of the nonconductive layer being in a range of 0.3 to 5.0 nm.
Claim 15
Dependent Claim
37 words
The device of claim 12 wherein said substrate is selected from the group consisting of Si, Ge, GaAs, GaP, GaN, GaSb, InAs, InP, InSb, and Al x Ga 1-x As, where x is from 0 to 1.
Claim 16
Dependent Claim
20 words
The device of claim 12 wherein said hole-injecting electrode is selected from the group consisting of noble and near-noble metals.
Claim 17
Dependent Claim
18 words
The device of claim 12 wherein said noble and near-noble metals include gold, silver, nickel, palladium, or platinum.
Claim 18
Dependent Claim
32 words
The device of claim 12 wherein said the organic electroluminescent layer is selected from the group of poly(paraphenylene vinylene) (PPV), PPV copolymers and derivatives, polyaniline, poly(3-alkylthiophene), poly(3-octylthiophene), poly(paraphenylene), or 8-hydroxyquinoline aluminum (Alq).
Claim 19
Dependent Claim
19 words
The device of claim 12 wherein the nonconductive materials have a low electron affmity or a strong dipole character.
Claim 20
Dependent Claim
26 words
The device of claim 17 wherein said the nonconductive layer is an alkali fluoride, an alkaline earth fluoride, an alkali oxide, or an alkaline earth oxide.
Claim 21
Dependent Claim
21 words
The device of claim 18 wherein said alkali fluoride includes lithium fluoride, sodium fluoride, potassium fluoride, rubidium fluoride, or cesium fluoride.
Claim 22
Dependent Claim
20 words
The device of claim 18 wherein said alkaline earth fluoride includes magnesium fluoride, calcium fluoride, strontium fluoride, or barium fluoride.
Claim 23
Dependent Claim
21 words
The device of claim 18 wherein said alkali oxide includes lithium oxide, sodium oxide, potassium oxide, rubidium oxide, or cesium oxide.
Claim 24
Dependent Claim
20 words
The device of claim 18 wherein said alkaline earth oxide includes magnesium oxide, calcium oxide, strontium oxide, or barium oxide.
Claim 25
Dependent Claim
22 words
The device of claim 12 wherein said conductive transparent overcoat layer is selected from the group consisting of oxides, nitrides, and sulfide.
Claim 26
Dependent Claim
15 words
The electrode of claim 23 wherein the nitride is GaN and the sulfide is ZnS.
Claim 27
Dependent Claim
23 words
The electrode of claim 23 wherein suitable metal oxides include indium-tin-oxide, aluminum- or indium-doped zinc oxide, tin oxide, magnesium-indium-oxide, nickel-tungsten oxide, and cadmium-tin-oxide.
References Cited (Backward Citations)
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