Light-emitting element, light-emitting device, and electronic device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsTsunenori Suzuki, Satoshi Seo
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Abstract
A light-emitting element is provided, including a first electrode and a second electrode, a first layer including first and second organic compounds, the first layer being formed between the first electrode and the second electrode wherein the first organic compound is capable of emitting a first light and the second organic compound has an electron transporting property, and a second layer including third and fourth organic compounds, the second layer being formed between the first layer and the second electrode wherein the third organic compound is capable of emitting a second light and has an electron trap property and the fourth organic compound has an electron transporting property.
Claims41
1-24. (canceled)
A light emitting device comprising:
- an anode;
- a light emitting layer over the anode;
- a first layer over the light emitting layer;
- an electron transporting layer over the first layer;
- and
- a cathode over the electron transporting layer,
- wherein the first layer is capable of retarding transfer of electron injected to the first layer from the cathode through the electron transporting layer.
A light emitting device comprising:
- an anode;
- a hole transporting layer over the anode;
- a light emitting layer over the hole transporting layer;
- a first layer over the light emitting layer;
- an electron transporting layer over the first layer;
- and
- a cathode over the electron transporting layer,
- wherein the first layer is capable of preventing electron, which is injected from the cathode through the electron transporting layer, from reaching the hole transporting layer.
A light emitting device comprising:
- an anode;
- a light emitting layer over the anode;
- a first layer over the light emitting layer;
- an electron transporting layer over the first layer;
- and
- a cathode over the electron transporting layer,
- wherein the first layer is capable of trapping electron, which is injected from the cathode through the electron transporting layer.
A light emitting device comprising:
- a first electrode;
- a first light emitting unit over the first electrode;
- a charge generation layer over the first light emitting unit;
- a second light emitting unit over the charge generation layer;
- and
- a second electrode over the second light emitting unit,
- wherein the charge generation layer is capable of injecting a hole to the second light emitting unit and an electron to the first light emitting unit,
- wherein each of the first light emitting unit and the second light emitting unit comprises:
- a first layer over the charge generation layer, the first layer comprising a first compound and a second compound;
- and
- a second layer over the first layer, the second layer comprising a third compound and a fourth compound,
- wherein the first compound is dispersed in the second compound which has an electron transporting property greater than a hole transporting property,
- wherein the third compound is dispersed in the fourth compound and has an electron trapping ability in the second layer, and
- wherein the fourth compound has an electron transporting property greater than a hole transporting property.
A light emitting device comprising:
- a first electrode;
- a first light emitting unit over the first electrode;
- a charge generation layer over the first light emitting unit;
- a second light emitting unit over the charge generation layer;
- and
- a second electrode over the second light emitting unit,
- wherein an emission color of the first light emitting unit and an emission color of the second light emitting unit are complementary to each other,
- wherein the charge generation layer is capable of injecting a hole to the second light emitting unit and an electron to the first light emitting unit,
- wherein the second light emitting unit comprises:
- a first layer over the charge generation layer, the first layer comprising a first compound and a second compound;
- and
- a second layer over the first layer, the second layer comprising a third compound and a fourth compound,
- wherein the first compound is dispersed in the second compound which has an electron transporting property greater than a hole transporting property,
- wherein the third compound is dispersed in the fourth compound and has an electron trapping ability in the second layer, and
- wherein the fourth compound has an electron transporting property greater than a hole transporting property.
Dependencies are inferred from the claim text.