Light-emitting element, light-emitting device, and electronic device
View Patent ↗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.
1. A light-emitting device comprising:
a pair of electrodes;
a first light-emitting element between the pair of electrodes;
a second light-emitting element between the pair of electrodes;
wherein the first light-emitting element comprises a first light-emitting layer having a first organic compound and a second organic compound, a first layer having a third organic compound, and a second layer having a fourth organic compound, and
wherein a LUMO level of the first organic compound is lower than a LUMO level of the second organic compound by 0.3 eV or more,
wherein the third organic compound and the fourth organic compound are metal complexes having a quinoline skeleton,
wherein the second light-emitting element comprises a second light-emitting layer having a fifth organic compound and a sixth organic compound, a third layer having a seventh organic compound, and a fourth layer having an eighth organic compound,
wherein a LUMO level of the fifth organic compound is lower than a LUMO level of the sixth organic compound by 0.3 eV or more, and
wherein the seventh organic compound and the eighth organic compound are metal complexes having a quinoline skeleton.
2. The light-emitting device according to claim 1 ,
wherein the first organic compound is dispersed in the second organic compound, and
wherein the fifth organic compound is dispersed in the sixth organic compound.
3. The light-emitting device according to claim 1 ,
wherein the first light-emitting element emits blue, and
wherein the second light-emitting element emits red.
4. The light-emitting device according to claim 1 , wherein one of the pair of electrodes has an indium oxide, and wherein the other has an alkali metal, an alkaline earth metal, or a rare earth metal.
5. An electronic device comprising:
a display device,
wherein the display device comprises the light-emitting device according to claim 1 .
6. A light-emitting device comprising:
an anode;
a cathode;
a first light-emitting element between the anode and the cathode;
a second light-emitting element between the anode and the cathode;
wherein the first light-emitting element comprises a first layer over the anode, a second layer over the first layer, a first light-emitting layer having a first organic compound and a second organic compound over the second layer, a third layer having a third organic compound over the first light-emitting layer, and a fourth layer having a fourth organic compound over the third layer,
wherein the first layer comprises a composite material of an aromatic amine compound and an acceptor substance,
wherein the second layer comprises an aromatic amine compound,
wherein a LUMO level of the first organic compound is lower than a LUMO level of the second organic compound by 0.3 eV or more,
wherein the third organic compound and the fourth organic compound are metal complexes having a quinoline skeleton,
wherein the second light-emitting element comprises a fifth layer over the anode, a sixth layer over the fifth layer, a second light-emitting layer having a fifth organic compound and a sixth organic compound, a seventh layer having a seventh organic compound, and an eighth layer having an eighth organic compound, and
wherein the fifth layer comprises a composite material of an aromatic amine compound and an acceptor substance,
wherein the sixth layer comprises an aromatic amine compound,
wherein a LUMO level of the fifth organic compound is lower than a LUMO level of the sixth organic compound by 0.3 eV or more, and
wherein the seventh organic compound and the eighth organic compound are metal complexes having a quinoline skeleton.
7. The light-emitting device according to claim 6 ,
wherein the first organic compound is dispersed in the second organic compound, and
wherein the fifth organic compound is dispersed in the sixth organic compound.
8. The light-emitting device according to claim 6 ,
wherein the first light-emitting element emits blue, and
wherein the second light-emitting element emits red.
9. The light-emitting device according to claim 6 , wherein the anode has an indium oxide, and wherein the cathode has an alkali metal, an alkaline earth metal, or a rare earth metal.
10. An electronic device comprising:
a display device,
wherein the display device comprises the light-emitting device according to claim 6 .