Patent EP0468437A2 successfully refreshed from Google Patents.
EP0468437A2
Expired / Lapsed
EP
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Electroluminescent device with improved cathode
Assignee: Eastman Kodak Co
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Filing: 1991-07-23
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Granted: —
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Expires: 2011-07-23
Abstract
Abstract An internal junction electroluminescent device is disclosed containing, in sequence, an anode, an organic hole injecting and transporting zone, an organic electron injecting and transporting zone forming a junction with the organic hole injecting and transporting zone, and a cathode comprised of a layer contacting the organic electron injecting and transporting zone containing a combination of magnesium and aluminum. Aluminum accounts for at least 80 percent of the cathode layer.
Inventors
- 👤 Steven Arland C/O Eastman Kodak Co. Van Slyke
- 👤 Ching Wan C/O Eastman Kodak Co. Tang
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 15:33
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/26; C; C09; C09K; C09K11/00; C09K11/06; H05B33/14; H10; H10K; H10K50/00; H10K50/80; H10K50/805; H10K50/82; H10K50/826; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
78 words
An internal junction organic electroluminescent device comprising in sequence, an anode, an organic hole injecting and transporting zone, an organic electron injecting and transporting zone forming a junction with the organic hole injecting and transporting zone, and a cathode comprised of a layer contacting the organic electron injecting and transporting zone containing a combination of magnesium and at least one higher work function metal, characterized in that aluminum accounts for at least 80 percent of the cathode layer.
Claim 2
Dependent Claim
78 words
An internal junction organic electroluminescent device comprising in sequence, an anode, an organic hole injecting and transporting zone, an organic electron injecting and transporting zone forming a junction with the organic hole injecting and transporting zone, and a cathode comprised of a layer contacting the organic electron injecting and transporting zone containing a combination of magnesium and at least one higher work function metal, characterized in that aluminum accounts for at least 80 percent of the cathode layer.
Claim 3
Dependent Claim
30 words
An internal junction organic electroluminescent device according to claim 1 further characterized in that said organic electron injecting and transporting zone is comprised of a stilbene or chelated oxinoid compound.
Claim 4
Dependent Claim
21 words
An internal junction organic electroluminescent device according to claim 1 or 2 further characterized in that said anode is light transmissive.
Claim 5
Dependent Claim
38 words
An internal junction organic electroluminescent device according to any one of claims 1 to 3 inclusive further characterized in that said cathode additionally includes a backing layer comprised of a metal having a higher work function than magnesium.
Claim 6
Dependent Claim
21 words
An internal junction organic electroluminescent device according to claim 4 further characterized in that said backing layer is comprised of aluminum.
Claim 7
Dependent Claim
37 words
An internal junction organic electroluminescent device according to any one of claims 1 to 5 inclusive further characterized in that said cathode layer contacting said electron injecting and transporting zone has a thickness of at least 25A.
Claim 8
Dependent Claim
31 words
An internal junction organic electroluminescent device according to claim 6 further characterized in that said cathode layer contacting said electron injecting and transporting zone has a thickness of at least 50A.
Claim 9
Dependent Claim
31 words
An internal junction organic electroluminescent device according to claim 7 further characterized in that said cathode layer contacting said electron injecting and transporting zone has a thickness of at least 100,4.
Claim 10
Dependent Claim
29 words
An internal junction organic electroluminescent device according to any one of claims 1 to 8 inclusive further characterized in that said cathode layer contains at least 0.05 percent magnesium.
Claim 11
Dependent Claim
23 words
An internal junction organic electroluminescent device according to claim 9 further characterized in that said cathode layer contains at least 0.1 percent magnesium.
References Cited (Backward Citations)
No citation records indexed.
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