Organic light emitting element

Patent metadata

Field	Value
Publication number	US-11139435-B2
Application number	US-201816018789-A
Country	US
Kind code	B2
Filing date	Jun 26, 2018
Priority date	Jun 11, 2013
Publication date	Oct 5, 2021
Grant date	Oct 5, 2021

Abstract

Provided is an organic light emitting element including: an anode; a cathode; and an organic compound layer formed between the anode and the cathode and including a hole injection layer, a hole transport layer, and an emission layer, in which: the emission layer includes a host and a dopant; the hole transport layer includes a hole transport material having multiple aromatic hydrocarbon skeletons and a single bond for linking the aromatic hydrocarbon skeletons; the hole transport material has a triplet level T1 of 1.8 eV or more; the hole transport material has a hole mobility of 1×10−5 cm2/Vs or more; and the hole transport layer and the emission layer satisfy relationships represented by the following expression (1):|reduction potential of hole transport material|−|reduction potential of host|>0.1 V  (1)and the following expression (2):|HOMO level of hole transport material−HOMO level of host|<0.1 eV  (2).

First claim

The invention claimed is:

1. An element comprising:
an anode;
a cathode; and
an organic compound layer disposed between the anode and the cathode and including a hole injection layer, a hole transport layer, and an emission layer,
wherein the emission layer includes a host and a dopant, the hole transport layer includes a hole transport material, and the hole injection layer includes a hole injection material,
wherein the hole transport layer satisfies a relationship represented by the following expression (3):
|oxidation potential of hole transport material−reduction potential of hole injection material|<1.4 eV  (3).

2. The element according to claim 1 , wherein the host and the hole transport material satisfy the following expression (1):
|reduction potential of hole transport material|−|reduction potential of host|>0.1 V  (1).

3. The element according to claim 1 , wherein the hole injection layer and the hole transport layer satisfy a relationship represented by the following expression (4):
|HOMO level of hole injection material|>|HOMO level of hole transport material|  (4).

4. The element according to claim 1 , wherein the hole injection material comprises a hexaazatriphenylene derivative.

5. The element according to claim 1 , wherein the hole transport material has a triplet level T1 of 1.8 eV or more.

6. The element according to claim 1 , wherein the hole transport material has a triplet level T1 of 2.5 eV or more.

7. The element according to claim 1 , wherein the hole transport material has a triplet level T1 of 2.3 eV or more.

8. The element according to claim 1 , wherein the emission layer comprises a compound selected from the group consisting of a pyrene derivative, an anthracene derivative, and a triphenylene derivative.

9. The element according to claim 1 , wherein the emission layer includes multiple kinds of dopants,
wherein at least one kind of the multiple kinds of dopants comprises a material that emits light having a color different from a color emitted by another kind of dopant, and
wherein the emission layer emits white light.

10. The element according to claim 1 , wherein the emission layer comprises multiple layers,
wherein at least one of the multiple layers emits light having a color different from a color emitted by another layer, and
wherein the emission layer emits white light.

11. A display apparatus comprising multiple pixels, wherein at least one of the multiple pixels includes the element according to claim 1 and an active element connected to the element, and
wherein at least part of the multiple pixels emits light to perform predetermined display.

12. A lighting apparatus comprising:
the element according to claim 1 ; and
an AC/DC converter circuit for supplying a driving voltage to the element.

13. The element according to claim 1 , wherein the hole injection layer contacts the anode.

14. The element according to claim 1 , wherein the anode is ITO, and the cathode is aluminum.

15. The element according to claim 1 , wherein the hole transport material has a hole mobility of 1×10 −5 cm 2 /Vs or more.

16. The element according to claim 2 , wherein the hole transport material has a triplet level T1 of 1.8 eV or more.

17. The element according to claim 1 , wherein the emission layer comprises a compound selected from the group consisting of a pyrene derivative and a triphenylene derivative.

18. The element according to claim 10 , wherein the hole transport material has a triplet level T1 of 1.8 eV or more.

19. The element according to claim 18 , wherein the emission layer comprises a compound selected from the group consisting of a pyrene derivative and a triphenylene derivative.

20. The element according to claim 18 , wherein the host and the hole transport material satisfy the following expression (1):
|reduction potential of hole transport material|−|reduction potential of host|>0.1 V  (1).

Assignees

• Canon Kk

Inventors

• Ishii Ryuji
• Ohrui Hiroki
• Tagami Kei
• Itabashi Masumi

Classifications

• H10K85/626

  containing more than one polycyclic condensed aromatic rings, e.g. bis-anthracene · CPC title

• C09K11/06 Primary

  containing organic luminescent materials · CPC title

• H10K2101/40

  Interrelation of parameters between multiple constituent active layers or sublayers, e.g. HOMO values in adjacent layers · CPC title

• C09K2211/1011

  Condensed systems · CPC title

• G03G15/04054

  by LED arrays · CPC title