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US5343050A
Expired / Lapsed
US
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Organic electroluminescent device with low barrier height
Assignee: Japan Display Central Inc
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Filing: 1993-01-05
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Granted: 1994-08-30
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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 Egusa
- 👤 Yoko Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:31
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: 11
Claim 1
Independent Claim
152 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, 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.
Claim 2
Dependent Claim
152 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, 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.
Claim 3
Dependent Claim
46 words
The device according to claim 1, wherein 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 >10 4 .
Claim 4
Dependent Claim
46 words
The device according to claim 1, wherein 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 >10 4 .
Claim 5
Dependent Claim
76 words
The device according to claim 1, wherein the barrier height against electron injection at each interface between layers present from the first electrode for electron injection to the organic film serving as the light-emitting layer is not more than 0.4 eV, and the barrier height against hole injection at each interface between layers present from the second electrode for hole injection to the organic film serving as the light-emitting layer is not more than 0.4 eV.
Claim 6
Dependent Claim
53 words
The device according to claim 1, wherein a barrier height against electron injection between the organic film serving as the light-emitting layer and the organic film on the side of the second electrode, which directly forms junction with the said organic film serving as the light-emitting layer is not less than 0.6 eV.
Claim 7
Dependent Claim
52 words
The device according to claim 1, wherein a barrier height against hole injection between the organic film serving as the light-emitting layer and the organic film on the side of the first electrode, which directly forms junction with the organic film serving as the light-emitting layer is not less than 0.6 eV.
Claim 8
Dependent Claim
36 words
The device according to claim 1, wherein 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 >10 4 .
Claim 9
Dependent Claim
25 words
The device according to claim 7, wherein the carrier mobility μ CIL in the carrier injection layer is higher than 10 -2 cm 2 /V·sec.
Claim 10
Dependent Claim
54 words
The device of claim 1, wherein each of said light-emitting film, the adjacent electron injection film and the adjacent hole injection film have a band gap, and said band gap of said light-emitting film is narrower than each of said band gaps of said adjacent electron injection film and said adjacent hole injection film.
Claim 11
Dependent Claim
85 words
The device of claim 1, wherein each of a first end organic film, a central organic film thereof and a second end organic film is comprised of a molecule having a basic skeleton, wherein said first end organic film is comprised of a molecule having a first basic skeleton, said second end organic film is comprised of a molecule containing a second basic skeleton, and said central organic film is comprised of a molecule containing both said first basic skeleton and said second basic skeleton.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-08-29 | 1998-02-28 | 1998-08-30 | $2000.00 | Window Closed / Lapsed |
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