US6255774B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multilayer cathode for organic light-emitting device
Assignee: Cambridge Display Technology Ltd
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Filing: 1997-09-04
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Granted: 2001-07-03
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Expires: 2017-09-04
Abstract
Abstract An organic light-emitting device wherein the cathode ( 4, 5 ) comprises a first layer ( 5 ) of a conducting material and a second layer ( 4 ) of a conductive material having a work function of at most 3.7 eV and wherein the second layer is substantially thinner than the first layer, having a thickness of at most 5 nm.
Inventors
- 👤 Karl Pichler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:24
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/26; H05B33/10; H10; H10K; H10K50/00; H10K50/80; H10K50/805; H10K50/82; H10K50/826; H10K2102/00; H10K2102/301; H10K2102/351
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
119 words
An organic light-emitting device, comprising at least one layer of a light-emissive organic material arranged between an anode and a cathode for the device, wherein the cathode comprises a first layer of a conductive material which is an opaque metallic layer of high conductivity and a second layer of a conductive material having a low work function arranged between the at least one layer of organic material and the first layer of conductive material, wherein the second layer of conductive material is substantially thinner than the first layer of conductive material, having a thickness of at most 5 nm, and comprises an elemental metal, an alloy or an intermetallic compound having a work function of at most 3.7 eV.
Claim 2
Dependent Claim
119 words
An organic light-emitting device, comprising at least one layer of a light-emissive organic material arranged between an anode and a cathode for the device, wherein the cathode comprises a first layer of a conductive material which is an opaque metallic layer of high conductivity and a second layer of a conductive material having a low work function arranged between the at least one layer of organic material and the first layer of conductive material, wherein the second layer of conductive material is substantially thinner than the first layer of conductive material, having a thickness of at most 5 nm, and comprises an elemental metal, an alloy or an intermetallic compound having a work function of at most 3.7 eV.
Claim 3
Dependent Claim
32 words
An organic light-emitting device according to claim 1 , wherein the second layer of conductive material has a thickness in the range of from 0.5 to 2 nm, preferably about 0.5 nm.
Claim 4
Dependent Claim
35 words
An organic light-emitting device according to claim 1 , wherein the second layer of conductive material comprises an elemental metal, an alloy or an intermetallic compound having a work function of at most 3.2 eV.
Claim 5
Dependent Claim
39 words
An organic light-emitting device according to any of claim 1 , wherein the second layer of conductive material comprises one of an alkali metal, an alkaline earth metal or a lanthanide, or an alloy or an intermetallic compound thereof.
Claim 6
Dependent Claim
27 words
An organic light-emitting device according to claim 4 , wherein the second layer of conductive material comprises one of Ca, K, Li, Sm or an Al—Li alloy.
Claim 7
Dependent Claim
34 words
An organic light-emitting device according to any of claim 1 , wherein the ratio of thicknesses of the first layer of conductive material to the second layer of conductive material is at least 20:1.
Claim 8
Dependent Claim
35 words
An organic light-emitting device according to claim 2 , wherein the second layer of conductive material comprises an elemental metal, an alloy or an intermetallic compound having a work function of at most 3.2 eV.
Claim 9
Dependent Claim
115 words
An organic light-emitting device, comprising at least one layer of a light-emissive organic material arranged between an anode and a cathode for the device, wherein the cathode comprises a first layer of a conductive material which is an opaque metallic layer of high conductivity and a second layer of a conductive material having a low work function arranged between the at least one layer of organic material and the first layer of conductive material, wherein the second layer of conductive material is substantially thinner than the first layer of conductive material, having a thickness of at most 5 nm, and consists essentially of an elemental metal having a work function of at most 3.7 eV.
Claim 10
Dependent Claim
115 words
An organic light-emitting device, comprising at least one layer of a light-emissive organic material arranged between an anode and a cathode for the device, wherein the cathode comprises a first layer of a conductive material which is an opaque metallic layer of high conductivity and a second layer of a conductive material having a low work function arranged between the at least one layer of organic material and the first layer of conductive material, wherein the second layer of conductive material is substantially thinner than the first layer of conductive material, having a thickness of at most 5 nm, and consists essentially of an elemental metal having a work function of at most 3.7 eV.
Claim 11
Dependent Claim
137 words
An organic light-emitting device, comprising at least one layer of a light-emissive organic material arranged between an anode and a cathode for the device, wherein the cathode comprises a first layer of a conductive material which is an opaque metallic layer of high conductivity and a second layer of a conductive material having a low work function arranged between the at least one layer of organic material and the first layer of conductive material, wherein the second layer of conductive material is substantially thinner than the first layer of conductive material, having a thickness of at most 5 nm, and comprises an elemental metal, an alloy or an intermetallic compound having a work function of at most 3.7 eV, wherein the ratio of the thickness of the first layer to the second layer is at least 20:1.
Claim 12
Dependent Claim
137 words
An organic light-emitting device, comprising at least one layer of a light-emissive organic material arranged between an anode and a cathode for the device, wherein the cathode comprises a first layer of a conductive material which is an opaque metallic layer of high conductivity and a second layer of a conductive material having a low work function arranged between the at least one layer of organic material and the first layer of conductive material, wherein the second layer of conductive material is substantially thinner than the first layer of conductive material, having a thickness of at most 5 nm, and comprises an elemental metal, an alloy or an intermetallic compound having a work function of at most 3.7 eV, wherein the ratio of the thickness of the first layer to the second layer is at least 20:1.
Claim 13
Dependent Claim
106 words
An organic light-emitting device, comprising at least one layer of a light-emissive organic material arranged between an anode and a cathode for the device, wherein the cathode comprises a first layer of a conductive material which is an opaque metallic layer of high conductivity and a second layer of a conductive material having a low work function arranged between the at least one layer of organic material and the first layer of conductive material, wherein the second layer of conductive material is substantially thinner than the first layer of conductive material, and the second layer has a thickness in a range of 0.5 to 2 nm.
Claim 14
Dependent Claim
106 words
An organic light-emitting device, comprising at least one layer of a light-emissive organic material arranged between an anode and a cathode for the device, wherein the cathode comprises a first layer of a conductive material which is an opaque metallic layer of high conductivity and a second layer of a conductive material having a low work function arranged between the at least one layer of organic material and the first layer of conductive material, wherein the second layer of conductive material is substantially thinner than the first layer of conductive material, and the second layer has a thickness in a range of 0.5 to 2 nm.
Claim 15
Dependent Claim
115 words
An organic light-emitting device, comprising at least one layer of a light-emissive organic material arranged between an anode and a cathode for the device, wherein the cathode comprises a first layer of a conductive material which is an opaque metallic layer of high conductivity and a second layer of a conductive material having a low work function arranged between the at least one layer of organic material and the first layer of conductive material, wherein the second layer of conductive material is substantially thinner than the first layer of conductive material, having a thickness in a range of 0.5 to 2 nm, and comprises a material having a work function of at least 3.7 eV.
Claim 16
Dependent Claim
115 words
An organic light-emitting device, comprising at least one layer of a light-emissive organic material arranged between an anode and a cathode for the device, wherein the cathode comprises a first layer of a conductive material which is an opaque metallic layer of high conductivity and a second layer of a conductive material having a low work function arranged between the at least one layer of organic material and the first layer of conductive material, wherein the second layer of conductive material is substantially thinner than the first layer of conductive material, having a thickness in a range of 0.5 to 2 nm, and comprises a material having a work function of at least 3.7 eV.
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