Light emitting device and method for manufacturing thereof
First Claim
1. A light emitting device comprising:
- a substrate;
an anode;
a cathode facing the anode;
light emitting layers each comprising an organic compound and being provided between the anode and the cathode; and
hole transporting layers each comprising an organic compound, wherein each of the light emitting layers and each of the hole transporting layers are alternately stacked, wherein a thickness of each of the hole transporting layers is thinner than a thickness of each of the light emitting layers, wherein each of the light emitting layers has an electron transporting property.
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Accused Products
Abstract
An object of the present invention is to provide a light emitting device including an organic light emitting layer and an organic compound and having high light emitting efficient along with less deterioration in characteristics. In the light emitting device, an anode, a cathode facing the anode, light emitting layers each comprising an organic compound and being provided between the anode and the cathode, and carrier transporting layers each comprising an organic compound, are provided over a substrate. Each of the light emitting layers and each of the carrier transporting layers are alternately stacked. A thickness of each of the carrier transporting layers is thinner than that of each of the light emitting layers. When each of the carrier transporting layers is a hole transporting layer, each of the light emitting layers has an electron transporting property. When each of the carrier transporting layers is an electron transporting layer, each of the light emitting layers has a hole transporting property.
74 Citations
40 Claims
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1. A light emitting device comprising:
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a substrate;
an anode;
a cathode facing the anode;
light emitting layers each comprising an organic compound and being provided between the anode and the cathode; and
hole transporting layers each comprising an organic compound, wherein each of the light emitting layers and each of the hole transporting layers are alternately stacked, wherein a thickness of each of the hole transporting layers is thinner than a thickness of each of the light emitting layers, wherein each of the light emitting layers has an electron transporting property. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A light emitting device comprising:
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a substrate;
an anode;
a cathode facing the anode;
light emitting layers each comprising an organic compound and being provided between the anode and the cathode; and
electron transporting layers each comprising an organic compound, wherein each of the light emitting layers and each of the electron transporting layers are alternately stacked, wherein a thickness of each of the electron transporting layers is thinner than a thickness of each of the light emitting layers, wherein each of the light emitting layers has a hole transporting property. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A light emitting device comprising:
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a substrate;
an anode;
a cathode facing the anode;
light emitting layers each comprising an organic compound and being provided between the anode and cathode;
a first hole transporting layer comprising an organic compound; and
second hole transporting layers each comprising an organic compound, wherein the first hole transporting layer is formed over the anode, wherein each of the light emitting layers and each of the second hole transporting layers are alternately stacked over the first hole transporting layer, wherein a thickness of each of the second hole transporting layers is thinner than a thickness of each of the light emitting layers, and wherein each of the light emitting layers has an electron transporting property. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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21. A light emitting device comprising:
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a substrate;
an anode;
a cathode facing the anode;
light emitting layers each comprising an organic compound and being provided between the anode and cathode;
a first electron transporting layer comprising an organic compound; and
second electron transporting layers each comprising an organic compound, wherein each of the light emitting layers and each of the second electron transporting layers are alternately stacked, wherein the first electron transporting layer is formed over the alternately stacked layer, wherein the cathode is formed over the first electron transporting layer, wherein a thickness of each of the second electron transporting layers is thinner than a thickness of each of the light emitting layers, and wherein each of the light emitting layers has a hole transporting property. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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29. A method for manufacturing a light emitting device comprising a substrate, an anode, a cathode facing the anode, light emitting layers each comprising an organic compound and being provided between the anode and the cathode, and carrier transporting layers each comprising an organic compound, wherein each of the light emitting layers and each of the carrier transporting layers are alternately stacked, a thickness of each of the carrier transporting layers is thinner than a thickness of each of the light emitting layer,
wherein the substrate is provided over an evaporation source of a carrier transporting material and an evaporation source of a light emitting material, wherein a first shutter, which is openable and closable, is provided between the evaporation source of the carrier transporting material and the substrate, wherein a second shutter, which is openable and closable, is provided between the evaporation source of the light emitting material and the substrate, and wherein each of the light emitting layers and each of the carrier transporting layers are alternately stacked by opening and closing the first and second shutters.
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32. A method for manufacturing a light emitting device comprising a substrate, an anode, a cathode facing the anode, light emitting layers each comprising an organic compound and being provided between the anode and the cathode, and carrier transporting layers each comprising an organic compound, wherein each of the light emitting layers and each of the carrier transporting layers are alternately stacked, a thickness of each of the carrier transporting layers is thinner than a thickness of each of the light emitting layers,
wherein the substrate is provided over a first rotating plate, wherein the first rotating plate is provided over an evaporation source of a light emitting material and an evaporation source of a carrier transporting material, wherein each of the light emitting layers and each of the carrier transporting layers are alternately stacked by rotating the first rotating plate and changing a distance between the evaporation source of the light emitting material and the substrate and a distance between the evaporation source of the carrier transporting material and the substrate.
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37. A method for manufacturing a light emitting device comprising a substrate, an anode, a cathode facing the anode, light emitting layers each comprising an organic compound and being provided between the anode and the cathode, and carrier transporting layers each comprising an organic compound, wherein each of the light emitting layers and each of the carrier transporting layers are alternately stacked, a thickness of each of the carrier transporting layers is thinner than a thickness of each of the light emitting layers,
wherein the substrate is provided over an evaporation source of a light emitting material and an evaporation source of a carrier transporting material, wherein a first mask, which is rotatable, is provided between the evaporation source of the light emitting material and the substrate, wherein a second mask, which is rotatable, is provided between the evaporation source of the carrier transporting material and the substrate, and wherein each of the light emitting layers and each of the carrier transporting layers are alternately stacked by controlling rotation of the first and second masks.
Specification