EP0553950A2
Expired / Lapsed
EP
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Organic electroluminescent device
Assignee: Toshiba Corp
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Filing: 1993-01-05
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Granted: —
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Expires: 2013-01-05
Abstract
Abstract There is disclosed an organic electroluminescent device, comprising a multilayered structure of an organic film for electron injection, and an organic film for hole injection, at least one of which consists of a plurality of layers, and an organic film serving as a light-emitting layer interposed therebetween, a first electrode for electron injection formed on the side of the organic film for electron injection of the multilayered structure, and a second electrode for hole injection formed on the side of the organic film for hole injection of the multilayered structure, wherein a barrier height against electron injection at each interface between layers present from the first electrode to the organic film serving as the light-emitting layer is not more than 0.6 eV, and a barrier height against hole injection at each interface between layers present from the second electrode to the organic film serving as the light-emitting layer is not more than 0.6 eV.
Inventors
- 👤 Syun C/O Intellectual Property Division Egusa
- 👤 Yoko c/o Intellectual Property Division Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 19:30
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/26; H05B33/14; H10; H10K; H10K50/00; H10K85/00; H10K85/60; H10K85/615; H10K85/621; H10K85/631; H10K85/649; H10K85/656; H10K85/6565; H10K85/657; H10K50/10; H10K50/14; H10K50/15; H10K50/156
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
151 words
An organic electroluminescent device comprising a multilayered structure consisting of first and second organic films (3, 4), in which said first organic film (4) serves as a light-emitting layer, a first electrode (5) for electron injection formed on a first organic film side of said multilayered structure, and a second electrode (2) for hole injection formed on a second organic film side of said multilayered structure, characterized in that a relation E V ₁ - E V ₂ ≦ 0.6 eV is satisfied where E V ₁ and E V ₂ are energy differences of valence bands of said first and second organic films (3, 4) from a vacuum level, respectively, and at least an interface of an organic film and an electrode with a higher junction barrier has such an interface structure that carriers can be tunnel-injected due to the decrease in a barrier thickness when a voltage is applied.
Claim 2
Dependent Claim
151 words
An organic electroluminescent device comprising a multilayered structure consisting of first and second organic films (3, 4), in which said second organic film (3) serves as a light-emitting layer, a first electrode (5) for electron injection formed on a first organic film side of said multilayered structure, and a second electrode (2) for hole injection formed on a second organic film side of said multilayered structure, characterized in that a relation E C ₁ - E C ₂ ≦ 0.6 eV is satisfied where E C ₁ and E C ₂ are energy differences of conduction bands of said first and second organic films (3, 4) from a vacuum level, respectively, and at least an interface of an organic film and an electrode with a higher junction barrier has such an interface structure that carriers can be tunnel-injected due to the decrease in a barrier thickness when a voltage is applied.
Claim 3
Dependent Claim
18 words
The device according to claim 1, characterized in that said first electrode (5) is a field emission electrode.
Claim 4
Dependent Claim
18 words
The device according to claim 2, characterized in that said second electrode (2) is a field emission electrode.
Claim 5
Dependent Claim
27 words
The device according to claim 1, characterized by further comprising a third organic film with electron injection properties between the first electrode and the first organic film.
Claim 6
Dependent Claim
27 words
The device according to claim 2, characterized by further comprising a third organic film with hole injection properties between the second electrode and the second organic film.
Claim 7
Dependent Claim
22 words
The device according to claim 1, characterized in that condition E V ₁ - E V ₂ ≦ 0.6 eV is satisfied.
Claim 8
Dependent Claim
22 words
The device according to claim 2, characterized in that condition E C ₁ - E C ₂ ≦ 0.6 eV is satisfied.
Claim 9
Dependent Claim
47 words
The device according to claim 1, characterized in that a carrier mobility µ LEL in the organic film serving as a light-emitting layer and a carrier mobility µ CIL in the organic film serving as a carrier injection layer satisfy condition µ CIL /µ LEL > 10⁴.
Claim 10
Dependent Claim
47 words
The device according to claim 2, characterized in that a carrier mobility µ LEL in the organic film serving as a light-emitting layer and a carrier mobility µ CIL in the organic film serving as a carrier injection layer satisfy condition µ CIL /µ LEL > 10⁴.
Claim 11
Dependent Claim
154 words
An organic electroluminescent device, comprising a multilayered structure consisting of an organic film for electron injection and an organic film for hole injection, at least one of which consists of a plurality of layers, and an organic film serving as a light-emitting layer interposed therebetween, a first electrode for electron injection formed on the side of the organic film for electron injection of the multilayered structure, and a second electrode for hole injection formed on the side of the organic film for hole injection of the multilayered structure, characterized in that a barrier height against electron injection at each interface between layers present from the first electrode to the organic film serving as the light-emitting layer is not more than 0.6 eV, and a barrier height against hole injection at each interface between layers present from the second electrode to the organic film serving as the light-emitting layer is not more than 0.6 eV.
Claim 12
Dependent Claim
45 words
The device according to claim 11, characterized in that molecules constituting a central organic film of three arbitrary adjacent organic films have a basic skeleton obtained by combining basic skeletons having different molecules and constituting end organic films of said three arbitrary adjacent organic films.
Claim 13
Dependent Claim
37 words
The device according to claim 11, characterized in that a carrier mobility µ LEL in said light-emitting layer and a carrier mobility µ CIL in a carrier injection layer satisfy condition µ CIL /µ LEL > 10⁴.
Claim 14
Dependent Claim
24 words
The device according to claim 13, characterized in that the carrier mobility µ CIL in the carrier injection layer is higher than 10⁻² cm²/V·sec.
References Cited (Backward Citations)
EP0390551A2
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EP0498979A1
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