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US5457565A
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US
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Organic electroluminescent device
Assignee: Pioneer Corp
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Filing: 1993-11-18
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Granted: 1995-10-10
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Expires: 2013-11-18
Abstract
Abstract An organic electroluminescent device comprises an anode, a positive-hole transport layer made of an organic compound, an emitting layer made of an organic compound, and a cathode which are layered in sequence, further comprising an electron-injecting layer containing at least one of alkaline earth metal oxides and disposed between the emitting layer and the cathode. This device emits light at a high luminance and a high efficiency upon application of a low voltage together with reduction of the decrement of luminance in the running of emitting light of the device. Selection scope for cathode materials is expanded because of the device is free from the restriction of a low work function for the cathode layer. The cathode can be made a transparent electrode such as ITO. Anode and cathode lines may be formed with low resistance material. As a result, emitting efficiency and life time of the device is improved.
Inventors
- 👤 Tohru Namiki
- 👤 Hitoshi Sato
- 👤 Kenichi Nagayama
- 👤 Teruichi Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:00
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
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
54 words
An organic EL device comprising: an anode, a positive-hole transport layer made of an organic compound, an emitting layer made of an organic compound, and a cathode which are layered in sequence; and an electron-injecting layer containing at least one of alkaline earth metal oxides and disposed between said emitting layer and said cathode.
Claim 2
Dependent Claim
54 words
An organic EL device comprising: an anode, a positive-hole transport layer made of an organic compound, an emitting layer made of an organic compound, and a cathode which are layered in sequence; and an electron-injecting layer containing at least one of alkaline earth metal oxides and disposed between said emitting layer and said cathode.
Claim 3
Dependent Claim
18 words
An organic EL device according to claim 1, wherein said cathode is made of a transparent conductive material.
Claim 4
Dependent Claim
20 words
An organic EL device according to claim 1, wherein said cathode and said anode are made of transparent conductive materials.
Claim 5
Dependent Claim
23 words
An organic EL device according to claim 1, further comprising an electron transport layer interposed between said electron-injecting layer and said emitting layer.
Claim 6
Dependent Claim
63 words
An electroluminescent (EL) device, comprising: an anode; a positive-hole transport layer, comprised of an organic compound, disposed adjacent to a surface of the anode; a cathode; an electron-injecting layer, including an alkaline earth metal oxide, disposed adjacent to a first surface of the cathode; and an emitting layer, comprised of an organic compound, disposed between the positive-hole transport layer and the electron-injecting layer.
Claim 7
Dependent Claim
63 words
An electroluminescent (EL) device, comprising: an anode; a positive-hole transport layer, comprised of an organic compound, disposed adjacent to a surface of the anode; a cathode; an electron-injecting layer, including an alkaline earth metal oxide, disposed adjacent to a first surface of the cathode; and an emitting layer, comprised of an organic compound, disposed between the positive-hole transport layer and the electron-injecting layer.
Claim 8
Dependent Claim
34 words
An EL device as recited in claim 5, further comprising a glass substrate, wherein a second surface of the cathode, opposite the first surface of the cathode, is formed adjacent to the glass substrate.
Claim 9
Dependent Claim
25 words
An EL device as recited in claim 5, wherein the alkaline earth metal oxide is selected from the group consisting of SrO, CaO and BaO.
Claim 10
Dependent Claim
25 words
An EL device as recited in claim 5, wherein a work function of the cathode is approximately equal to a work function of the anode.
Claim 11
Dependent Claim
20 words
An EL device as recited in claim 8, wherein the cathode and the anode are comprised of a same material.
Claim 12
Dependent Claim
19 words
An EL device as recited in claim 8, wherein the cathode and the anode are comprised of indium-tin oxide.
Claim 13
Dependent Claim
16 words
An EL device as recited in claim 5, wherein the cathode is comprised of indium-tin oxide.
Claim 14
Dependent Claim
23 words
An EL device as recited in claim 5, further comprising an electron transport layer interposed between the electron-injecting layer and the emitting layer.
References Cited (Backward Citations)
US5247190A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1998-10-09 | 1999-04-10 | 1999-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-10-09 | 2003-04-10 | 2003-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-10-09 | 2007-04-10 | 2007-10-10 | $7700.00 | Window Closed / Lapsed |