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1. US20170256732 - Light-Emitting Element, Light-Emitting Device, and Electronic Device

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[ EN ]

Claims

1. (canceled)
2. A light-emitting element comprising:
an anode;
a first layer over the anode, the first layer comprising a first organic compound having light-emitting property and a second organic compound having electron transporting property;
a second layer over and in contact with the first layer, the second layer comprising a third organic compound and a fourth organic compound; and
a cathode over the second layer,
wherein a LUMO level of the third organic compound is lower than a LUMO level of the fourth organic compound by 0.3 eV or more.
3. The light-emitting element according to claim 2, further comprising a hole transporting layer,
wherein the hole transporting layer is formed between the anode and the first layer.
4. The light-emitting element according to claim 2, wherein the fourth organic compound has electron transporting property.
5. The light-emitting element according to claim 2,
wherein the first organic compound exhibits emission of bluish light, and
wherein the third organic compound exhibits emission of blue to blue green light.
6. The light-emitting element according to claim 2, wherein a difference between a peak value of an emission spectrum of the first organic compound and a peak value of an emission spectrum of the third organic compound is 0 nm or more and less than 30 nm.
7. A lighting device comprising the light-emitting element according to claim 2.
8. An electronic device comprising:
a display device,
wherein the display device comprises the light-emitting element according to claim 2.
9. A light-emitting element comprising:
an anode;
a first layer over the anode, the first layer comprising a first organic compound having light-emitting property and a second organic compound having electron transporting property;
a second layer over and in contact with the first layer, the second layer comprising a third organic compound and a fourth organic compound;
an electron transporting layer over the second layer; and
a cathode over the electron transporting layer,
wherein a LUMO level of the third organic compound is lower than a LUMO level of the fourth organic compound by 0.3 eV or more.
10. The light-emitting element according to claim 9, further comprising a hole transporting layer,
wherein the hole transporting layer is formed between the anode and the first layer.
11. The light-emitting element according to claim 9, wherein the fourth organic compound has electron transporting property.
12. The light-emitting element according to claim 9,
wherein the first organic compound exhibits emission of bluish light, and
wherein the third organic compound exhibits emission of blue to blue green light.
13. The light-emitting element according to claim 9, wherein a difference between a peak value of an emission spectrum of the first organic compound and a peak value of an emission spectrum of the third organic compound is 0 nm or more and less than 30 nm.
14. A lighting device comprising the light-emitting element according to claim 9.
15. An electronic device comprising:
a display device,
wherein the display device comprises the light-emitting element according to claim 9.