IP Library › Granted Patent US 10,937,981
Granted Patent B2
US 10,937,981 · App. 15/468,429 · Granted Mar 2, 2021

Light-emitting element, light-emitting device, and electronic device

Inventors: Tsunenori Suzuki (Kanagawa, JP); Satoshi Seo (Kanagawa, JP)
H01L51/5012H01L51/5036H01L51/006H01L51/0052H01L51/0062H01L51/0067H01L51/0071H01L51/0081H01L51/5278
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Quick Facts
Patent No.
US 10,937,981
App. No.
15/468,429
Granted
Mar 2, 2021
Kind
B2
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.

Claims (37)

1. A light-emitting element comprising:

an anode;

a first light-emitting layer over the anode, the first light-emitting layer comprising a first organic compound having light-emitting property and a second organic compound having electron transporting property;

a second light-emitting layer over and in contact with the first light-emitting layer, the second light-emitting layer comprising a third organic compound having light-emitting property and a fourth organic compound; and

a cathode over the second light-emitting 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, and

wherein the third organic compound is dispersed in the fourth organic compound.

2. The light-emitting element according to claim 1 , further comprising a hole transporting layer,

wherein the hole transporting layer is formed between the anode and the first light-emitting layer.

3. The light-emitting element according to claim 1 , wherein the fourth organic compound has electron transporting property.

4. The light-emitting element according to claim 1 ,

wherein the first organic compound exhibits emission of bluish light, and

wherein the third organic compound exhibits emission of blue to blue green light.

5. The light-emitting element according to claim 1 , 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.

6. A lighting device comprising the light-emitting element according to claim 1 .

7. An electronic device comprising:

a display device,

wherein the display device comprises the light-emitting element according to claim 1 .

8. A light-emitting element comprising:

an anode;

a first light-emitting layer over the anode, the first light-emitting layer comprising a first organic compound having light-emitting property and a second organic compound having electron transporting property;

a second light-emitting layer over and in contact with the first light-emitting layer, the second light-emitting layer comprising a third organic compound having light-emitting property and a fourth organic compound;

an electron transporting layer over the second light-emitting 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, and

wherein the third organic compound is dispersed in the fourth organic compound.

9. The light-emitting element according to claim 8 , further comprising a hole transporting layer,

wherein the hole transporting layer is formed between the anode and the first light-emitting layer.

10. The light-emitting element according to claim 8 , wherein the fourth organic compound has electron transporting property.

11. The light-emitting element according to claim 8 ,

wherein the first organic compound exhibits emission of bluish light, and

wherein the third organic compound exhibits emission of blue to blue green light.

12. The light-emitting element according to claim 8 , 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.

13. A lighting device comprising the light-emitting element according to claim 8 .

14. An electronic device comprising:

a display device,

wherein the display device comprises the light-emitting element according to claim 8 .

Priority Claims (1)
JP JP2006-155159 · Jun 2, 2006 · national
Continuity (3)
Continuation 13240003 · Sep 22, 2011
Continuation 11804747 · May 18, 2007
Related Publication 20170256732A1 · Sep 7, 2017
Cited By (1)
US 12,219,873