US5674597A
Expired / Lapsed
US
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Organic electroluminescent elements
Assignee: Sanyo Electric Co Ltd
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Filing: 1995-01-13
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Granted: 1997-10-07
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Expires: 2015-01-13
Abstract
Abstract Organic electroluminescent elements capable of operating at a low driving voltage, leading to saving of electric power and operating cost for a driving circuit. In an organic electroluminescent element in which a hole transport layer and a luminous layer are formed between a hole injecting electrode layer and an electron injecting electrode layer which are oppositely arranged in a pair and in which the hole transport layer is overlaid on the hole injecting electrode layer, the hole transport layer is doped with a hole injection material at least at a region near the interface between the hole transport layer and a hole injecting electrode. The hole injection material has an ionization potential which is lower than that of the material of the hole transport layer and higher than that of the material of the hole injecting electrode layer.
Inventors
- 👤 Takanori Fujii
- 👤 Takeshi Sano
- 👤 Masayuki Fujita
- 👤 Yuji Hamada
- 👤 Kosuke Takeuchi
- 👤 Kenichi Shibata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:09
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; H10; H10K; H10K50/00; H10K50/10; H10K50/14; H10K50/15; H10K50/155; H10K50/17; Y; Y10; Y10S; Y10S428/00; Y10S428/917; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
90 words
An organic electroluminescent element comprising a hole transport layer and a luminous layer between an opposed hole injecting electrode layer and electron injecting electrode layer, the hole transport layer being overlaid on the hole injecting electrode layer, wherein the hole transport layer is doped with a hole injection material at least at a region in contact with the hole injecting electrode layer, the hole injection material having an ionization potential which is lower than that of the hole transport layer and higher than that of the hole injecting electrode layer.
Claim 2
Dependent Claim
90 words
An organic electroluminescent element comprising a hole transport layer and a luminous layer between an opposed hole injecting electrode layer and electron injecting electrode layer, the hole transport layer being overlaid on the hole injecting electrode layer, wherein the hole transport layer is doped with a hole injection material at least at a region in contact with the hole injecting electrode layer, the hole injection material having an ionization potential which is lower than that of the hole transport layer and higher than that of the hole injecting electrode layer.
Claim 3
Dependent Claim
43 words
An organic electroluminescent element according to claim 1, wherein the hole transport layer is doped with the hole: injection material such that the density of the hole injection material gradually decreases from the hole injecting electrode side towards the electron injecting electrode side.
Claim 4
Dependent Claim
31 words
An organic electroluminescent element according to claim 1, wherein the hole transport layer is doped with the hole injection material only at the region in contact with the hole injecting electrode.
Claim 5
Dependent Claim
53 words
An organic electroluminescent element according to claim 1, wherein the hole injection material is selected from a group consisting of an amine compound, pentacene, carbazole dioxazine, Eu(TTA)3phen, copper phthalocyanine, NK-757(1-ethyl-2- (1-ethyl-2(1H)-quinolylidene)methyl!quinolinium iodide), flavanthrone, leuco crystal violet, leuco malachite green, naphthacane and decacyclene which are described by Chemical Formulas 101 to 111, respectively. ##STR5##
Claim 6
Dependent Claim
64 words
An organic electroluminescent element according to claim 1, wherein the hole transport layer is doped with a plurality of hole injection materials at least at a region in contact with the hole injecting electrode, each of the hole injection materials having an ionization potential which is lower than that of the hole transport layer and higher than that of the hole injecting electrode layer.
Claim 7
Dependent Claim
55 words
An organic electroluminescent element according to claim 5, wherein the plurality of hole injection materials are selected from a group consisting of an amine compound, pentacene, carbazole dioxszine, Eu(TTA)3phen, copper phthalocyanine, NK-757(1-ethyl-2 (1-ethyl-2(1H)-quinolylidene)methyl!quinolinium iodide), flavanthrone, leuco crystal violet, leuco malachite green, naphthacene and decacyclene which are described by Chemical Formulas 112 to 122, respectively ##STR6##
Claim 8
Dependent Claim
28 words
An organic electroluminescent element according to claim 1, wherein an electron transport layer is further interposed between the opposed hole injecting electrode layer and electron injecting electrode layer.
Claim 9
Dependent Claim
87 words
An organic electroluminescent element comprising a luminous layer and an electron transport layer between an opposed hole injecting electrode layer and electron injecting electrode layer, the luminous layer being overlaid on the hole injecting electrode layer, wherein the luminous layer is doped with a hole injection material at least at a region in contact with the hole injecting electrode layer, the hole injection material having an ionization potential which is lower than that of the luminous layer and higher than that of the hole injecting electrode layer.
Claim 10
Dependent Claim
87 words
An organic electroluminescent element comprising a luminous layer and an electron transport layer between an opposed hole injecting electrode layer and electron injecting electrode layer, the luminous layer being overlaid on the hole injecting electrode layer, wherein the luminous layer is doped with a hole injection material at least at a region in contact with the hole injecting electrode layer, the hole injection material having an ionization potential which is lower than that of the luminous layer and higher than that of the hole injecting electrode layer.
Claim 11
Dependent Claim
42 words
An organic electroluminescent element according to claim 8, wherein the luminous layer is doped with the hole injection material such that the density of the hole injection material gradually decreases from the hole injecting electrode side towards the electron injecting electrode side.
Claim 12
Dependent Claim
30 words
An organic electroluminescent element according to claim 8, wherein the luminous layer is doped with the hole injection material only at the region in contact with the hole injecting electrode.
Claim 13
Dependent Claim
53 words
An organic electroluminescent element according to claim 8, wherein the hole injection material is selected from a group consisting of an amine compound, pentacene, carbazole dioxazine, Eu(TTA)3phen, copper phthalocyanine, NK-757(1-ethyl-2- (1-ethyl-2(1H)-quinolylidene)methyl!quinolinium iodide), flavanthrone, leuco crystal violet, leuco malachite green, naphthacene and decacyclene which are described by Chemical Formulas 123 to 133, respectively ##STR7##
Claim 14
Dependent Claim
62 words
An organic electroluminescent element according to claim 8, wherein the luminous layer is doped with a plurality of hole injection materials at least at a region in contact with the hole injecting electrode, each of the hole injection materials having an ionization potential which is lower than that of the luminous layer and higher than that of the hole injecting electrode layer.
Claim 15
Dependent Claim
53 words
An organic electroluminescent element according to claim 12, wherein the hole injection material is selected from a group consisting of an amine compound, pentacene, carbazole dioxazine, Eu(TTA)3phen, copper phthalocyanine, NK-757(1-ethyl-2- (1-ethyl-2(1H)-quinolylidene)methyl!quinolinium iodide), flavanthrone, leuco crystal violet, leuco malachite green, naphthacene and decacyclene which are described by Chemical Formulas 134 to 144, respectively ##STR8##
Claim 16
Dependent Claim
17 words
An organic electroluminescent element according to claim 8, wherein the luminous layer is a hole transport layer.
Claim 17
Dependent Claim
42 words
An organic electroluminescent element according to claim 14, wherein the luminous layer is doped with the hole injection material such that the density of the hole injection material gradually decreases from the hole injecting electrode side towards the electron injecting electrode side.
Claim 18
Dependent Claim
30 words
An organic electroluminescent element according to claim 14, wherein the luminous layer is doped with the hole injection material only at the region in contact with the hole injecting electrode.
Claim 19
Dependent Claim
53 words
An organic electroluminescent element according to claim 14, wherein the hole injection material is selected from a group consisting of an amine compound, pentacene, carbazole dioxazine, Eu(TTA)3phen, copper phthalocyanine, NK-757(1-ethyl-2- (1-ethyl-2(1H)-quinolylidene)methyl!quinolinium iodide), flavanthrone, leuco crystal violet, leuco malachite green, naphthacene and decacyclene which are described by Chemical Formulas 145 to 155, respectively ##STR9##
References Cited (Backward Citations)
US5093698A
Cited
US5343050A
Cited
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