Patent EP0349265A2 successfully refreshed from Google Patents.
EP0349265A2
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EP
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Electroluminescent devices
Assignee: Eastman Kodak Co
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Filing: 1989-06-27
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Granted: —
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Expires: 2009-06-27
Abstract
Abstract A matrix addressed organic electroluminescent device (100) providing extremely small pixel sizes comprises anode strips (102, 104, 106), an organic electroluminescent medium (110) coated on the anode strips, and cathode strips (112, 114, 116) coated on the organic electroluminescent medium. The cathode strips are formed by photolithographic techniques which do not damage the organic electroluminescent medium. In one preferred embodiment the electroluminescent medium includes a fluorescent material which emits light in response to hole-electron recombination.
Inventors
- 👤 Michael C/O Eastman Kodak Company Scozzafava
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 07:41
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; H05B33/26; H10; H10K; H10K59/00; H10K59/10; H10K59/17; H10K59/80; H10K59/805; H10K2102/00; H10K2102/301; H10K2102/351
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
130 words
An electroluminescent device comprised of an anode, a planar electroluminescent medium coated on the anode, and a cathode coated on the planar electroluminescent medium, characterized in that said planar electroluminescent medium is comprised of an organic hole injecting zone adjacent said anode and an organic electron injecting luminescent zone adjacent said cathode, said anode is comprised of a plurality of laterally spaced strips contacting said organic hole injecting zone, said strips having a center-to-center spacing of less than 400µm, said cathode is comprised of a plurality of laterally spaced strips contacting said organic electron injecting luminescent zone, said strips having a center-to-center spacing of less than 400µm, and said cathode and anode strips are relatively oriented to be in part superimposed over and in part laterally offset from each other.
Claim 2
Dependent Claim
130 words
An electroluminescent device comprised of an anode, a planar electroluminescent medium coated on the anode, and a cathode coated on the planar electroluminescent medium, characterized in that said planar electroluminescent medium is comprised of an organic hole injecting zone adjacent said anode and an organic electron injecting luminescent zone adjacent said cathode, said anode is comprised of a plurality of laterally spaced strips contacting said organic hole injecting zone, said strips having a center-to-center spacing of less than 400µm, said cathode is comprised of a plurality of laterally spaced strips contacting said organic electron injecting luminescent zone, said strips having a center-to-center spacing of less than 400µm, and said cathode and anode strips are relatively oriented to be in part superimposed over and in part laterally offset from each other.
Claim 3
Dependent Claim
72 words
An electroluminescent device according to claim 1 further characterized in that said cathode strips are oriented with their major axes substantially parallel, said anode strips are oriented with their major axes parallel, and, when viewed in a direction normal to said planar electroluminescent medium, said major axes of said cathode strips are angularly oriented relative to said major axes of said anode strips at an angle ranging from 30 to 150 degrees.
Claim 4
Dependent Claim
37 words
An electroluminescent device according to claim 2 further characterized in that, when viewed in a directed normal to said planar electroluminescent medium, said major axes of said cathode and anode strips are essentially perpendicular to each other.
Claim 5
Independent Claim
32 words
A device according to any one of claims 1 to 3 inclusive further characterized in that said cathode strips exhibit a thickness in the range of from 100 Angstroms to 1 µm.
Claim 6
Independent Claim
27 words
A device according to any one of claims 1 to 4 inclusive further characterized in that the total thickness of the electroluminescent medium is less than 1µm.
Claim 7
Dependent Claim
25 words
A device according to claim 5 further characterized in that the total thickness of the electroluminescent medium is in the range from 0.1 to 0.5µm.
Claim 8
Independent Claim
26 words
A device according to any one of claims 1 to 6 inclusive further characterized in that the center-to-center spacing of said strips is less than 300µm.
Claim 9
Dependent Claim
20 words
A device according to claim 7 further characterized in that the center-to-center spacing of said strips is less than 100µm.
Claim 10
Independent Claim
45 words
A device according to any one of claims 1 to 8 inclusive further characterized in that said cathode is comprised of a plurality of metals other than an alkali metal, at least one of said metals having a work function of less than 4 eV.
Claim 11
Dependent Claim
60 words
An electroluminescent device according to any one of claims 1 to 9 inclusive further characterized in that said organic hole injecting zone is comprised of a layer in contact with said anode containing a hole injecting porphyrinic compound and a layer containing a hole transporting aromatic tertiary amine interposed between said hole injection layer and said electron injecting luminescent zone.
Claim 12
Dependent Claim
59 words
An electroluminescent device according to any one of claims 1 to 10 inclusive further characterized in that said electron injecting luminescent zone exhibits a thickness of less than 1 µm and is comprised of an organic host material capable of sustaining both hole and electron injection and a fluorescent material capable of emitting light in response to hole-electron recombination.
Claim 13
Dependent Claim
21 words
An electroluminescent device according to claim 11 in which said fluorescent material is chosen to provide favored sites for light emission.
Claim 14
Dependent Claim
33 words
An electroluminescent device according to claim 11 or 12 in which said fluorescent material is located in a layer containing said organic host material and in contact with said organic hole injecting zone.
Claim 15
Dependent Claim
41 words
An electroluminescent device according to any one of claims 11 to 13 inclusive in which said fluorescent material has a bandgap no greater than that of said host material and a reduction potential less negative than that of said host material.
Claim 16
Dependent Claim
21 words
An electroluminescent device according to any one of claims 11 to 14 inclusive in which said fluorescent material is a dye.
Claim 17
Dependent Claim
33 words
An electroluminescent device according to claim 15 in which said dye is chosen from the class consisting of coumarin, dicyanomethylenepyrans and thiopyrans, polymethine, oxabenzanthracene, xanthene, pyrylium and thiapyrylium, carbostyril, and perylene fluorescent dyes.
Claim 18
Dependent Claim
103 words
An electroluminescent device according to claim 16 in which said fluorescent dye is a coumarin dye of the formula: where R¹ is chosen from the group consisting of hydrogen, carboxy, alkanoyl, alkoxycarbonyl, cyano, aryl, and a heterocylic aromatic group, R² is chosen from the group consisting of hydrogen, alkyl, haloalkyl, carboxy, alkanoyl, and alkoxycarbonyl, R³ is chosen from the group consisting of hydrogen and alkyl, R⁴ is an amino group, and R⁵ is hydrogen, or R¹ and R² together form a fused carbocyclic ring, and/or the amino group forming R⁴ independently completes with at least one of R³ and R⁵ a fused ring.
Claim 19
Dependent Claim
43 words
An electroluminescent device according to claim 16 in which said fluorescent dye is a dye of the formula: where X represents oxygen or sulfur; R⁶ represents a 2-(4-aminostyryl) group; and R⁷ represents a second R⁶ group, an alkyl group, or an aryl group.
References Cited (Backward Citations)
No citation records indexed.
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