Organic light emitting element

Patent metadata

Field	Value
Publication number	US-2018301633-A1
Application number	US-201816018789-A
Country	US
Kind code	A1
Filing date	Jun 26, 2018
Priority date	Jun 11, 2013
Publication date	Oct 18, 2018
Grant date	—

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 T 1 of 1.8 eV or more; the hole transport material has a hole mobility of 1×10 −5 cm 2 /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

1 .- 15 . (canceled)

16 . 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), and

wherein the hole transport material has a home mobility of 1×10 −5 cm 2 /Vs or more.

17 . The element according to claim 16 , wherein the host material and the hole transport material satisfy the following expression (1):
|reduction potential of hole transport material|−|reduction potential of host|>0.1 V  (1).

18 . The element according to claim 16 , 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).

19 . The element according to claim 16 , wherein the hole injection material comprises a hexaazatriphenylene derivative.

20 . The element according to claim 16 , wherein the hole transport material has a triplet level T 1 of 1.8 eV or more.

21 . The element according to claim 16 , wherein the hole transport material has a triplet level T 1 of 2.5 eV or more.

22 . The element according to claim 16 , wherein the hole transport material has a triplet level T 1 of 2.3 eV or more.

23 . The element according to claim 16 , wherein the emission layer comprises a compound selected from the group consisting of a pyrene derivative, an anthracene derivative, and a triphenylene derivative.

24 . The element according to claim 16 , wherein the organic compound layer further comprises an electron transport layer, and the electron transport layer comprises a compound including an anthracene backbone and a benzimidazole backbone.

25 . The element according to claim 16 , wherein the emission layer includes multiple kinds of guests,
wherein at least one kind of the multiple kinds of guests comprises a material that emits light having a color different from a color emitted by another kind of guest, and wherein the emission layer emits white light.

26 . The element according to claim 16 , 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.

27 . A display apparatus comprising multiple pixels, wherein at least one of the multiple pixels includes the element according to claim 16 and an active element connected to the element, and
wherein at least part of the multiple pixels emits light to perform predetermined display.

28 . A lighting apparatus comprising:
the element according to claim 16 ; and an AC/DC converter circuit for supplying a driving voltage to the element.

Assignees

• Canon Kk

Inventors

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

Classifications

• C09K2211/1011

  Condensed systems · CPC title

• G03G15/04054

  by LED arrays · CPC title

• C09K2211/1007

  Non-condensed systems · CPC title

• C09K11/025

  non-luminescent particle coatings or suspension media · CPC title

• G09G3/3208

  organic, e.g. using organic light-emitting diodes [OLED] · CPC title