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US5648181A
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Inorganic thin film electroluminescent device having a light emission layer
Assignee: Fujifilm Business Innovation Corp
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Filing: 1995-11-28
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Granted: 1997-07-15
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Expires: 2015-11-28
Abstract
Abstract An inorganic thin film EL device comprises, on an insulating substrate 1, a back electrode 2, an insulating layer 3, a light emission layer 4, an insulating layer 3, and a transparent electrode 5 formed on the substrate 1 in this order. The emission layer comprises lanthanum fluoride and at least one member selected from the group consisting of rare earth element metals and compounds thereof. The rare earth element is, for example, cerium, praseodymium, neodium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and mixture thereof. The compounds maybe those compounds of the rare earth elements and fluorine, chlorine, bromine, iodine and oxygen. The rare earth element is preferably present in the emission layer in an amount of from 5 to 90 wt %.
Inventors
- 👤 Masao Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:26
CPC Classifications
B; B32; B32B; B32B18/00; Y; Y10; Y10S; Y10S428/00; Y10S428/917
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
108 words
An inorganic thin film electroluminescent device, comprising an inorganic light emission layer, a pair of electrodes and a pair of insulating layers, at least one of the electrodes being optically transparent, the light emission layer being positioned between the pair of insulating layers, each insulating layer being formed on an opposite side of the light emission layer, the pair of insulating layers being positioned between a light emission layer and the pair of electrodes, the light emission layer consisting essentially of inorganic material comprising a matrix of lanthanum fluoride doped with at least one member selected from the group consisting of rare earth element metals and compounds thereof.
Claim 2
Dependent Claim
108 words
An inorganic thin film electroluminescent device, comprising an inorganic light emission layer, a pair of electrodes and a pair of insulating layers, at least one of the electrodes being optically transparent, the light emission layer being positioned between the pair of insulating layers, each insulating layer being formed on an opposite side of the light emission layer, the pair of insulating layers being positioned between a light emission layer and the pair of electrodes, the light emission layer consisting essentially of inorganic material comprising a matrix of lanthanum fluoride doped with at least one member selected from the group consisting of rare earth element metals and compounds thereof.
Claim 3
Dependent Claim
31 words
The inorganic thin film electroluminescent device of claim 1, wherein said at least one member is present in said emission layer in an amount of from 5 to 90 wt %.
Claim 4
Dependent Claim
41 words
The inorganic thin film electroluminescent device of claim 1, wherein said at least one member is a rare earth element selected from the group consisting of cerium, praseodymium, neodium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and mixtures thereof.
Claim 5
Dependent Claim
43 words
The inorganic thin film electroluminescent of claim 1, wherein said at least one member is a compound of a rare earth element selected from the group consisting of compounds of said rare earth element and fluorine, chlorine, bromine, iodine, oxygen and mixtures thereof.
Claim 6
Dependent Claim
29 words
The inorganic thin film electroluminescent device of claim 1, further comprising an insulating substrate supporting an optically non-transparent electrode, said non-transparent electrode being one of the pair of electrodes.
Claim 7
Dependent Claim
20 words
The inorganic thin film electroluminescent device of claim 1, further comprising an optically transparent substrate supporting the optically transparent electrode.
Claim 8
Dependent Claim
32 words
The inorganic thin film electroluminescent device of claim 1, further comprising a pair of semiconductor layers, each semiconductor layer positioned between said emission layer and a corresponding one of said insulating layers.
Claim 9
Dependent Claim
20 words
The inorganic thin film electroluminescent device of claim 7, wherein each said semiconductor layer consists essentially of an inorganic semiconductor.
Claim 10
Dependent Claim
20 words
The inorganic thin film electroluminescent device of claim 7, wherein each said semiconductor layer consists essentially of an organic semiconductor.
Claim 11
Dependent Claim
21 words
The inorganic thin film electroluminescent device of claim 1, wherein the light emission layer further comprises a co-activator comprising a metal.
Claim 12
Dependent Claim
16 words
The inorganic thin film electroluminescent device of claim 10, wherein the co-activator is gold or zinc.
Claim 13
Dependent Claim
23 words
The inorganic thin film electroluminescent device of claim 1, wherein the light emission layer has a thickness of from 0.2 to 3.0 μm.
Claim 14
Dependent Claim
41 words
An inorganic thin film electroluminescent device, comprising an inorganic light emission layer consisting essentially of inorganic material comprising a matrix lanthanum fluoride doped with at least one member selected from the group consisting of rare earth element metals and compounds thereof.
Claim 15
Dependent Claim
41 words
An inorganic thin film electroluminescent device, comprising an inorganic light emission layer consisting essentially of inorganic material comprising a matrix lanthanum fluoride doped with at least one member selected from the group consisting of rare earth element metals and compounds thereof.
Claim 16
Dependent Claim
32 words
The inorganic thin film electroluminescent device of claim 13, wherein said at least one member is present in said light emission layer in an amount of from 5 to 90 wt. %.
Claim 17
Dependent Claim
41 words
The inorganic thin film electroluminescent device of claim 13, wherein said at least one member is a rare earth element selected from the group consisting of cerium, praseodymium, neodium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and mixtures thereof.
Claim 18
Dependent Claim
45 words
The inorganic thin film electroluminescent device of claim 13, wherein said at least one member is a compound of a rare earth element selected from the group consisting of compounds of said rare earth element with fluorine, chlorine, bromine, iodine, or oxygen, and mixtures thereof.
Claim 19
Dependent Claim
29 words
The inorganic thin film electroluminescent device of claim 13, wherein said light emission layer consists essentially of said lanthanum fluoride, said at least one member, and, optionally, a coactivator.
Claim 20
Dependent Claim
31 words
The inorganic thin film electroluminescent device of claim 13, wherein at least one of said lanthanum fluoride and said at least one member are main components of the light emission layer.
Claim 21
Dependent Claim
22 words
The inorganic thin film electroluminescent device of claim 13, wherein said light emission layer comprises at least 10 wt. % lanthanum fluoride.
Claim 22
Dependent Claim
50 words
An inorganic thin film electroluminescent device, comprising an inorganic light emission layer comprising a host material of a lanthanum fluoride matrix and an emission center formed by doping said lanthanum fluoride matrix with at least one member selected from the group consisting of rare earth element metals and compounds thereof.
Claim 23
Dependent Claim
50 words
An inorganic thin film electroluminescent device, comprising an inorganic light emission layer comprising a host material of a lanthanum fluoride matrix and an emission center formed by doping said lanthanum fluoride matrix with at least one member selected from the group consisting of rare earth element metals and compounds thereof.
Claim 24
Dependent Claim
103 words
An inorganic thin film electroluminescent device, comprising an inorganic light emission layer, a pair of electrodes and a pair of insulating layers, at least one of the electrodes being optically transparent, the light emission layer being positioned between the pair of insulating layers, each insulating layer being formed on an opposite side of the light emission layer, the pair of insulating layers being positioned between a light emission layer and the pair of electrodes, the light emission layer comprising a matrix of lanthanum fluoride doped with at least one member selected from the group consisting of rare earth element metals and compounds thereof.
Claim 25
Dependent Claim
103 words
An inorganic thin film electroluminescent device, comprising an inorganic light emission layer, a pair of electrodes and a pair of insulating layers, at least one of the electrodes being optically transparent, the light emission layer being positioned between the pair of insulating layers, each insulating layer being formed on an opposite side of the light emission layer, the pair of insulating layers being positioned between a light emission layer and the pair of electrodes, the light emission layer comprising a matrix of lanthanum fluoride doped with at least one member selected from the group consisting of rare earth element metals and compounds thereof.
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