LIGHT-EMITTING ELEMENT AND LIGHT EMITTING DEVICE USING THE SAME
First Claim
1. A method for manufacturing a light-emitting element comprising:
- forming a first layer comprising molybdenum and a first compound by evaporation;
forming a second layer comprising the first compound over the first layer by evaporation;
forming a third layer comprising a second compound and a third compound over the second layer by evaporation;
forming a fourth layer comprising the second compound over the third layer by evaporation; and
forming a fifth layer comprising lithium and the second compound over the fourth layer.
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Abstract
The present invention provides a light-emitting element having less increase in driving voltage with the accumulation of light-emission time, and provides a light-emitting element having less increase in resistance value with the increase in film thickness. A light-emitting element includes a first layer, a second layer and a third layer between a first electrode and a second electrode. The first layer is provided to be closer to the first electrode than the second layer, and the third layer is provided to be closer to the second electrode than the second layer. The first layer is a layer including an aromatic amine compound and a substance showing an electron accepting property to the aromatic amine compound. The second layer includes a substance of which an electron transporting property is stronger than a hole transporting property, and a substance showing an electron donating property to the aforementioned substance.
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Citations
18 Claims
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1. A method for manufacturing a light-emitting element comprising:
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forming a first layer comprising molybdenum and a first compound by evaporation; forming a second layer comprising the first compound over the first layer by evaporation; forming a third layer comprising a second compound and a third compound over the second layer by evaporation; forming a fourth layer comprising the second compound over the third layer by evaporation; and forming a fifth layer comprising lithium and the second compound over the fourth layer. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for manufacturing a light-emitting element comprising:
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forming a first layer comprising molybdenum and a first compound by evaporation; forming a second layer comprising the first compound over the first layer by evaporation; forming a third layer comprising a second compound and a third compound over the second layer by evaporation; forming a fourth layer comprising the second compound over the third layer by evaporation; forming a fifth layer comprising lithium and the second compound over the fourth layer by evaporation; and forming a sixth layer comprising molybdenum and the first compound over the fifth layer by evaporation. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A light-emitting element comprising:
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a first electrode, a first layer comprising molybdenum and a first compound over and in contact with the first electrode; a second layer comprising the first compound over the first layer; a third layer comprising a second compound and a third compound over the second layer; a fourth layer comprising the second compound over the third layer; a fifth layer comprising lithium and the second compound over the fourth layer; and a second electrode over the fifth layer. - View Dependent Claims (16, 17, 18)
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Specification