Patent EP0554569A2 successfully refreshed from Google Patents.
EP0554569A2
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EP
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Efficient organic electroluminescent device of simplified construction
Assignee: Eastman Kodak Co
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Filing: 1992-12-29
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Granted: —
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Expires: 2012-12-29
Abstract
Abstract An organic electroluminescent device is disclosed comprised of, in sequence, an anode, an organic electroluminescent medium, and a cathode. The organic electroluminescent medium is formed by an organic host material capable of sustaining both hole and electron injection in contact with both the anode and the cathode and a fluorescent dye capable of emitting light in response to hole-electron recombination located in the host material and spaced from the cathode. The dye has a bandgap no greater than that of the host material and a reduction potential at least 0.4 volt less negative than that of the host material.
Inventors
- 👤 Jon Eric C/O Eastman Kodak Company Littman
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-10 00:54
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/06; H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; H05B33/20; H10; H10K; H10K50/00; H10K50/10; H10K50/11; H10K85/00; H10K85/30; H10K85/321; H10K85/324; H10K85/60
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
108 words
An organic electroluminescent device comprised of, in sequence, an anode, an organic electroluminescent medium of less than 1 µm in thickness, and a cathode, CHARACTERIZED IN THAT the organic electroluminescent medium consists essentially of in contact with both the anode and the cathode an organic host material capable of sustaining both hole and electron injection and located in the host material and spaced from the cathode a fluorescent dye capable of emitting light in response to hole-electron recombination, the dye having a bandgap no greater than that of the organic host material and a reduction potential at least 0.4 volt less negative than that of the host material.
Claim 2
Dependent Claim
120 words
An organic electroluminescent device as claimed in 1 further characterized in that organic host material in contact with the anode and cathode is chosen from the class consisting of (a) (b) (R s -Q)₂-Al-O-L and (c) (R s -Q)₂-Al-O-Al-(Q-R s )₂ where L is a hydrocarbon of from 6 to 24 carbon atoms comprised of a phenyl moiety, Me represents a metal, n is an integer of from 1 to 3, O-L is phenolato ligand, and Q in each occurrence represents a substituted 8-quinolinolato ligand, R s represents an 8-quinolinolato ring substituent chosen to block sterically the attachment of more than two substituted 8-quinolinolato ligands to the aluminum atom, and Z represents the atoms necessary to complete an oxine nucleus.
Claim 3
Dependent Claim
30 words
An organic electroluminescent device as claimed in 1 further characterized in that the dye has a reduction potential at least 0.45 volt less negative than that of the host material.
Claim 4
Dependent Claim
235 words
An organic electroluminescent device comprised of, in sequence, an anode, an organic electroluminescent medium of less than 1 µm in thickness, and a cathode, CHARACTERIZED IN THAT the organic electroluminescent medium is comprised of a first region in contact with the cathode and a second region in contact with the anode, the first region consists essentially of where Me represents a metal, n is an integer of from 1 to 3, and Z represents the atoms necessary to complete an oxine nucleus, and the second region consists essentially of a host material selected from among at least one of the following: (a) (b) (R s -Q)₂-Al-O-L and (c) (R s -Q)₂-Al-O-Al-(Q-R s )₂ where L is a hydrocarbon of from 6 to 24 carbon atoms comprised of a phenyl moiety, Me represents a metal, n is an integer of from 1 to 3, O-L is phenolato ligand, and Q in each occurrence represents a substituted 8-quinolinolato ligand, R s represents an 8-quinolinolato ring substituent chosen to block sterically the attachment of more than two substituted 8-quinolinolato ligands to the aluminum atom, and Z represents the atoms necessary to complete an oxine nucleus, and a fluorescent dye capable of emitting light in response to hole-electron recombination, the dye having a bandgap no greater than that of the organic host material and a reduction potential at least 0.4 volt less negative than that of the host material.
Claim 5
Dependent Claim
19 words
An organic electroluminescent device as claimed in 4 further characterized in that the dye is a 4-dicyanomethylene-4H-pyran or 4-dicyano-methylene-4H-thiopyran.
Claim 6
Dependent Claim
18 words
An organic electroluminescent device as claimed in 4 further characterized in that the dye is a coumarin dye.
References Cited (Backward Citations)
No citation records indexed.
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