Organic light-emitting device

Patent metadata

Field	Value
Publication number	US-10950801-B2
Application number	US-201916646960-A
Country	US
Kind code	B2
Filing date	May 3, 2019
Priority date	Jun 18, 2018
Publication date	Mar 16, 2021
Grant date	Mar 16, 2021

Abstract

Provided is an organic light emitting device including a cathode; an anode provided opposite to the cathode; a light emitting layer provided between the cathode and the anode; and an organic material layer provided between the cathode and the light emitting layer, and including Compound (A) including a heteroatom and a cyano group, wherein Compound (A) satisfies Equation 1 and Equation 2:

| P El CN |≥3debye  Equation 1
wherein: |P El CN | means an absolute value of a dipole moment of Compound (A);



P
EI

C
⁢
N





P
EI



>



Ea
EI
CN





Ea
EI



Equation
⁢

⁢
2

wherein:
|P El CN | means an absolute value of a dipole moment of Compound (A);
|P El | means an absolute value of a dipole moment of a compound having the same core as the compound of |P El CN | without including a cyano group;
|Ea El CN | means an absolute value of electron affinity of Compound (A); and
|Ea El | means an absolute value of electron affinity of a compound having the same core as the compound of |Ea El CN | without including a cyano group.

First claim

The invention claimed is:

1. An organic light emitting device comprising:
a cathode;
an anode provided opposite to the cathode;
one or more of a light emitting layer provided between the cathode and the anode; and
an organic material layer provided between the cathode and the light emitting layer, and including Compound (A) including a heteroatom and a cyano group,
wherein Compound (A) satisfies the following Equation 1 and the following Equation 2:
| P El CN |≥3debye  Equation 1

wherein in Equation 1:
|P El CN | means an absolute value of a dipole moment of Compound (A);



P
EI

C
⁢
N





P
EI



>



Ea
EI
CN





Ea
EI



Equation
⁢

⁢
2

wherein in Equation 2:
|P El CN | means an absolute value of a dipole moment of Compound (A);
|P El | means an absolute value of a dipole moment of a compound having the same core as the compound of |P El CN | without including a cyano group;
|Ea El CN | means an absolute value of electron affinity of Compound (A); and
|Ea El | means an absolute value of electron affinity of a compound having the same core as the compound of |Ea El CN | without including a cyano group.

2. The organic light emitting device of claim 1 , wherein the organic material layer is a hole blocking layer, an electron transfer layer, an electron injection layer, or an electron injection and transfer layer.

3. The organic light emitting device of claim 1 , further comprising a hole blocking layer provided between the light emitting layer and the organic material layer,
wherein the hole blocking layer is provided adjoining the light emitting layer; and the organic material layer is an electron injection and transfer layer.

4. The organic light emitting device of claim 1 , wherein Compound (A) has electron mobility of greater than or equal to 10 −12 cm 2 /Vs and less than or equal to 10 2 cm 2 /Vs under an electric field condition of 0.1 MV/cm.

5. The organic light emitting device of claim 1 , wherein the organic material layer has a glass transition temperature (Tg) of higher than 100° C. and lower than or equal to 200° C.

6. The organic light emitting device of claim 1 , wherein the light emitting layer includes a host and a dopant, and the dopant has a maximum light emission wavelength in a range of 420 nm to 520 nm.

7. The organic light emitting device of claim 6 , wherein the dopant is a blue fluorescent dopant.

8. The organic light emitting device of claim 1 , wherein the organic material layer further includes a metal complex, and includes Compound (A):the metal complex in a weight ratio of 1:9 to 9:1.

9. The organic light emitting device of claim 1 , wherein Compound (A) is a compound including a heteroring including at least one N.

10. The organic light emitting device of claim 1 , comprising two or more light emitting layers.

11. The organic light emitting device of claim 10 , wherein at least two of the two or more light emitting layers have a different maximum light emission wavelength.

12. The organic light emitting device of claim 10 , wherein at least one of the two or more light emitting layers includes a phosphorescent dopant, and at least one of the light emitting layers includes a fluorescent dopant.

13. The organic light emitting device of claim 1 , comprising:
a first light emitting layer provided between the anode and the organic material layer including Compound (A); and
a second light emitting layer provided on the first light emitting layer.

14. The organic light emitting device of claim 1 , comprising:
a first light emitting layer provided on a part of between the anode and the organic material layer including Compound (A); and
a second light emitting layer provided on the remaining part of between the anode and the organic material layer including Compound (A).

15. The organic light emitting device of claim 1 , comprising:
a first light emitting layer provided between the anode and the organic material layer including Compound (A);
a second light emitting layer provided on the first light emitting layer; and
a third light emitting layer provided on the second light emitting layer.

Assignees

• Lg Chemical Ltd

Inventors

• Huh Jungoh
• Lee Sangbin
• Hong Sung Kil

Classifications

• H10K85/6572 Primary

  comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole · CPC title

• H10K85/615 Primary

  Polycyclic condensed aromatic hydrocarbons, e.g. anthracene · CPC title

• C09K11/06

  containing organic luminescent materials · CPC title

• H01L51/0067

  Electricity · mapped topic

• H01L51/5092

  Electricity · mapped topic