Light emitting element

Patent metadata

Field	Value
Publication number	US-12593608-B2
Application number	US-202217748389-A
Country	US
Kind code	B2
Filing date	May 19, 2022
Priority date	Sep 13, 2021
Publication date	Mar 31, 2026
Grant date	Mar 31, 2026

Abstract

A light emitting element according to an embodiment includes a first electrode, a second electrode disposed on the first electrode, an emission layer disposed between the first electrode and the second electrode, and a double buffer layer including a first layer disposed on the emission layer and a second layer disposed on the first layer. The first layer includes a first compound, the second layer includes a second compound which is different from the first compound, and the first compound and the second compound are each independently represented by Formula 1 or Formula 2, thereby contributing to increased efficiency and increased life of a light emitting element.

First claim

What is claimed is:

1 . A light emitting element, comprising:
a first electrode; a second electrode disposed on the first electrode; an emission layer disposed between the first electrode and the second electrode; and a double buffer layer comprising:
a first layer disposed on the emission layer; and
a second layer disposed on the first layer, wherein
the first layer comprises a first compound, the second layer comprises a second compound which is different from the first compound, and the first compound and the second compound each independently comprises a pyrimidine group or a carbazole group substituted with at least one cyano group.

2 . The light emitting element of claim 1 , wherein the first compound and the second compound are each independently represented by Formula 1 or Formula 2:

wherein in Formula 1,
R 1 is a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted silyl group, a substituted or unsubstituted amine group, a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group of 2 to 20 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group of 2 to 30 ring-forming carbon atoms, or is combined with an adjacent group to form a ring, and
n is an integer from 0 to 4,

wherein in Formula 2,
R 2a , R 2b , and R 2c are each independently a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted silyl group, a substituted or unsubstituted amine group, a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group of 2 to 20 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group of 2 to 30 ring-forming carbon atoms, or are combined with an adjacent group to form a ring,
m1 is an integer from 0 to 4, and
m2 is an integer from 0 to 3.

3 . The light emitting element of claim 2 , wherein
the emission layer comprises:
a third compound represented by Formula 1 or Formula 2;
a fourth compound represented by Formula 3; and
a fifth compound represented by Formula 4, and
the third compound is different from at least one of the first compound and the second compound:

wherein in Formula 3,
R 3a , R 3b , and R 3c are each independently a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted silyl group, a substituted or unsubstituted amine group, a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group of 2 to 20 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group of 2 to 30 ring-forming carbon atoms, or are combined with an adjacent group to form a ring, and
p1 and p2 are each independently an integer from 0 to 4,

wherein in Formula 4,
M is Pt, Pd, Cu, Au, or Os,
X is O or C(R 4a )(R 4b ),
Cy 1 , Cy 2 , Cy 3 , and Cy 4 are each independently a substituted or unsubstituted hydrocarbon ring of 5 to 60 ring-forming carbon atoms, or a substituted or unsubstituted heterocycle of 1 to 60 ring-forming carbon atoms,
L 1 to L 3 are each independently a direct linkage,

q1 to q4 are each independently 0 or 1, and
R 4a , R 4b , and R 11 to R 20 are each independently a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted silyl group, a substituted or unsubstituted amine group, a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group of 2 to 20 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group of 2 to 30 ring-forming carbon atoms, or are combined with an adjacent group to form a ring.

4 . The light emitting element of claim 3 , wherein
at least one of the first compound, the second compound, and the third compound is represented by Formula 1, and the at least one of the first compound, the second compound, and the third compound that is represented by Formula 1 is represented by Formula 1-1:

wherein in Formula 1-1,
R 1a , R 1b , and R 1c are each independently a deuterium atom, a halogen atom, a substituted or unsubstituted silyl group, a substituted or unsubstituted amine group, a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group of 2 to 20 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group of 2 to 30 ring-forming carbon atoms, or are combined with an adjacent group to form a ring.

5 . The light emitting element of claim 3 , wherein
at least one of the first compound, the second compound, and the third compound is represented by Formula 2, and the at least one of the first compound, the second compound, and the third compound that is represented by Formula 2 is represented by one of Formula 2-1, Formula 2-2, or Formula 2-3:

wherein in Formula 2-1 to Formula 2-3,
R 2d and R 2e are each independently a deuterium atom, a halogen atom, a substituted or unsubstituted silyl group, a substituted or unsubstituted amine group, a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group of 2 to 20 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group of 2 to 30 ring-forming carbon atoms, or are combined with an adjacent group to form a ring, and
R 2a is the same as defined in Formula 2.

6 . The light emitting element of claim 3 , wherein the fourth compound represented by Formula 3 is represented by Formula 3-1:

wherein in Formula 3-1,
R 3a , R 3b , and R 3c are the same as defined in Formula 3.

7 . The light emitting element of claim 3 , wherein in Formula 4, M is Pt.

8 . The light emitting element of claim 3 , wherein the first compound, the second compound, and the third compound each independently comprises at least one selected from Compound Group 1:

Assignees

• Samsung Display Co Ltd

Inventors

• Um Hyunah
• Kim Minje
• Park Youngjin
• Ahn Heechoon
• Yun Juhui
• Lee Yeseul
• Im Yirang

Classifications

• H10K50/16

  Electron transporting layers · CPC title

• H10K85/6574

  comprising only oxygen in the heteroaromatic polycondensed ring system, e.g. cumarine dyes · CPC title

• H10K85/654

  comprising only nitrogen as heteroatom (H10K85/652 takes precedence) · CPC title

• H10K85/346

  comprising platinum · CPC title

• H10K85/40

  Organosilicon compounds, e.g. TIPS pentacene · CPC title