Light-emitting element, light-emitting device and an electronic device, which include two layers including same light-emitting organic compound
First Claim
1. A light emitting element comprising:
- a first electrode;
a first layer over the first electrode;
a second layer over and in contact with the first layer;
a first charge generation layer over the second layer;
a third layer over the first charge generation layer;
a fourth layer over and in contact with the third layer; and
a second electrode over the fourth layer,wherein the first layer includes a first light-emitting organic compound and a first organic compound having a hole-transporting property,wherein the second layer includes the first light-emitting organic compound and a second organic compound having an electron-transporting property,wherein the third layer includes a second light-emitting organic compound and a third organic compound having a hole-transporting property, andwherein the fourth layer includes the second light-emitting organic compound and a fourth organic compound having an electron-transporting property.
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Abstract
The present invention provides a light-emitting element including an electron-transporting layer and a hole-transporting layer between a first electrode and a second electrode; and a first layer and a second layer between the electron-transporting layer and the hole-transporting layer, wherein the first layer includes a first organic compound and an organic compound having a hole-transporting property, the second layer includes a second organic compound and an organic compound having an electron-transporting property, the first layer is formed in contact with the first electrode side of the second layer, the first organic compound and the second organic compound are the same compound, and a voltage is applied to the first electrode and the second electrode, so that both of the first organic compound and the second organic compound emit light.
89 Citations
41 Claims
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1. A light emitting element comprising:
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a first electrode; a first layer over the first electrode; a second layer over and in contact with the first layer; a first charge generation layer over the second layer; a third layer over the first charge generation layer; a fourth layer over and in contact with the third layer; and a second electrode over the fourth layer, wherein the first layer includes a first light-emitting organic compound and a first organic compound having a hole-transporting property, wherein the second layer includes the first light-emitting organic compound and a second organic compound having an electron-transporting property, wherein the third layer includes a second light-emitting organic compound and a third organic compound having a hole-transporting property, and wherein the fourth layer includes the second light-emitting organic compound and a fourth organic compound having an electron-transporting property. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A light emitting element comprising:
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a first electrode; a first layer over the first electrode; a second layer over and in contact with the first layer; a first charge generation layer over the second layer; a third layer over the first charge generation layer; a fourth layer over and in contact with the third layer; and a second electrode over the fourth layer, wherein the first layer includes a first light-emitting organic compound and a first organic compound having a hole-transporting property, wherein the second layer includes the first light-emitting organic compound and a second organic compound having an electron-transporting property, wherein the third layer includes a second light-emitting organic compound and a third organic compound having a hole-transporting property, wherein the fourth layer includes the second light-emitting organic compound and a fourth organic compound having an electron-transporting property, wherein a highest occupied molecular orbital level of the first organic compound is greater than or equal to −
6.0 eV and less than or equal to −
5.0 eV, and a lowest unoccupied molecular orbital level of the first organic compound is greater than or equal to −
3.0 eV and less than or equal to −
2.0 eV,wherein a highest occupied molecular orbital level of the second organic compound is greater than or equal to −
6.0 eV and less than or equal to −
5.0 eV, and a lowest unoccupied molecular orbital level of the second organic compound is greater than or equal to −
3.0 eV and less than or equal to −
2.0 eV,wherein a highest occupied molecular orbital level of the third organic compound is greater than or equal to −
6.0 eV and less than or equal to −
5.0 eV, and a lowest unoccupied molecular orbital level of the third organic compound is greater than or equal to −
3.0 eV and less than or equal to −
2.0 eV, andwherein a highest occupied molecular orbital level of the fourth organic compound is greater than or equal to −
6.0 eV and less than or equal to −
5.0 eV, and a lowest unoccupied molecular orbital level of the fourth organic compound is greater than or equal to −
3.0 eV and less than or equal to −
2.0 eV. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A light emitting element comprising:
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a first electrode; a first layer over the first electrode; a second layer over and in contact with the first layer; a first charge generation layer over the second layer; a third layer over the first charge generation layer; a fourth layer over and in contact with the third layer; and a second electrode over the fourth layer, wherein the first layer includes a first light-emitting organic compound and a first organic compound having a hole-transporting property, wherein the second layer includes the first light-emitting organic compound and a second organic compound having an electron-transporting property, wherein the third layer includes a second light-emitting organic compound and a third organic compound having a hole-transporting property, wherein the fourth layer includes the second light-emitting organic compound and a fourth organic compound having an electron-transporting property, and wherein the first organic compound, the second organic compound, the third organic compound, and the fourth organic compound are reversible to an oxidative reaction and a reductive reaction. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A light emitting element comprising:
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a first electrode; a first layer over the first electrode; a second layer over and in contact with the first layer; and a second electrode over the second layer, wherein the first layer includes a first light-emitting organic compound and a first organic compound having a hole-transporting property, and wherein the second layer includes the first light-emitting organic compound and a second organic compound having an electron-transporting property. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41)
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Specification