Electron transport materials with selected dipole moments

Patent metadata

Field	Value
Publication number	US-10074809-B2
Application number	US-201515509178-A
Country	US
Kind code	B2
Filing date	Oct 27, 2015
Priority date	Oct 27, 2014
Publication date	Sep 11, 2018
Grant date	Sep 11, 2018

Abstract

An exemplary embodiment of the present specification provides an organic electroluminescence device including: an anode; a cathode; a light emitting layer provided between the anode and the cathode; and an electron transporting layer provided between the cathode and the light emitting layer, in which the electron transporting layer includes a first electron transporting material and a second electron transporting material, the first electron transporting material is an organic material including a monocyclic or polycyclic ring which includes an N-containing six-membered ring, the second electron transporting material is an organic material including a five-membered hetero ring which includes at least one heteroatom of N, O, and S, or a cyano group, and a dipole moment of the second electron transporting material is larger than a dipole moment of the first electron transporting material.

First claim

The invention claimed is:

1. An organic electroluminescence device comprising:
an anode;
a cathode;
a light emitting layer provided between the anode and the cathode; and
an electron transporting layer provided between the cathode and the light emitting layer,
wherein the electron transporting layer comprises a first electron transporting material and a second electron transporting material,
the first electron transporting material is an organic material comprising a monocyclic or polycyclic ring which includes an N-containing six-membered ring,
the second electron transporting material is an organic material comprising a five-membered hetero ring which includes at least one heteroatom of N, O, and S, or a cyano group, and
a dipole moment of the second electron transporting material is larger than a dipole moment of the first electron transporting material.

2. The organic electroluminescence device of claim 1 , wherein the first electron transporting material has a dipole moment of 0 Debye to 3 Debye, and the second electron transporting material has a dipole moment of 1 Debye to 7 Debye.

3. The organic electroluminescence device of claim 1 , wherein the first electron transporting material comprises a structure represented by the following Formula 1:

in the Formula 1,
one to three of X 1 to X 6 is (are) N,
the others are CR 1 and R 1 is a monovalent organic group, and
adjacent monovalent organic groups optionally combine with each other to form a substituted or unsubstituted aliphatic ring or a substituted or unsubstituted aromatic ring.

4. The organic electroluminescence device of claim 1 , wherein the first electron transporting material is an organic material comprising pyridine, pyrimidine, or triazine.

5. The organic electroluminescence device of claim 1 , wherein the second electron transporting material comprises a structure represented by the following Formula 5:

in the Formula 5,
Y 1 is NR 21 , O, or S,
Y 2 to Y 5 are the same as or different from each other, and are each N or CR 22 ,
R 21 and R 22 are the same as or different from each other, and are each a monovalent organic group, and
adjacent monovalent organic groups optionally combine with each other to form a substituted or unsubstituted aliphatic ring or a substituted or unsubstituted aromatic ring.

6. The organic electroluminescence device of claim 1 , wherein the second electron transporting material is an organic material comprising imidazole, oxazole, or thiazole.

7. The organic electroluminescence device of claim 1 , wherein the second electron transporting material is an organic material comprising benzimidazole, benzoxazole, or benzothiazole.

8. The organic electroluminescence device of claim 1 , wherein the second electron transporting material comprises a structure represented by the following Formula 14:
CN-(L 31 ) t -R 31   [Formula 14]

in Formula 14,
L 31 is a divalent organic group and t is an integer of 0 to 4, and when t is 2 or more, L 31 's are the same as or different from each other, and
R 31 is a monovalent organic group.

9. The organic electroluminescence device of claim 1 , wherein the first electron transporting material and the second electron transporting material do not comprise a metal element or a metal complex.

10. The organic electroluminescence device of claim 1 , wherein the first electron transporting material and the second electron transporting material do not comprise a metal complex.

11. The organic electroluminescence device of claim 1 , wherein the first electron transporting material and the second electron transporting material each have a molecular weight of 400 Da to 900 Da.

12. The organic electroluminescence device of claim 1 , wherein the electron transporting layer comprising the first electron transporting material and the second electron transporting material comprises the first electron transporting material and the second electron transporting material at a volume ratio of 1:99 to 99:1.

13. The organic electroluminescence device of claim 1 , further comprising:
an electron injection layer provided between the electron transporting layer and the cathode.

Assignees

• Lg Chemical Ltd

Inventors

• Jang Boonjae
• JANG Jungl
• Kim Seong So
• Lee Dong Hoon

Classifications

• C09K2211/1014

  bridged by heteroatoms, e.g. N, P, Si or B · CPC title

• C07D401/10

  linked by a carbon chain containing aromatic rings · CPC title

• C07D277/66

  with aromatic rings or ring systems directly attached in position 2 · CPC title

• C07D403/10

  linked by a carbon chain containing aromatic rings · CPC title

• C07D235/02

  condensed with carbocyclic rings or ring systems · CPC title