Light emitting diode and condensed polycyclic compound for the same

Patent metadata

Field	Value
Publication number	US-12378469-B2
Application number	US-202117549384-A
Country	US
Kind code	B2
Filing date	Dec 13, 2021
Priority date	Mar 16, 2021
Publication date	Aug 5, 2025
Grant date	Aug 5, 2025

Abstract

A light emitting diode includes a first electrode, a second electrode, and at least one functional layer disposed between the first electrode and containing a condensed polycyclic compound represented by Formula 1. The first electrode and the second electrode each independently contain at least one selected from Ag, Mg, Cu, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, Li, Ca, LiF, Mo, Ti, W, In, Sn, and Zn, compounds selected thereof, and mixtures thereof. The light emitting diode may achieve improved luminous efficiency:

First claim

What is claimed is:

1. A light emitting diode comprising:
a first electrode;
a second electrode on the first electrode; and
at least one functional layer between the first electrode and the second electrode, the at least one functional layer comprising a condensed polycyclic compound represented by Formula 1,
wherein the first electrode and the second electrode each independently comprise at least one selected from Ag, Mg, Cu, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, Li, Ca, LiF, Mo, Ti, W, In, Sn, and Zn, compounds selected thereof, and mixtures thereof:

wherein in Formula 1,
X 1 , X 2 , X 3 , and X 4 are each independently NR X , O, S, or Se,
R x , and R 1 to R 8 are each independently a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted silyl group, a substituted or unsubstituted amine group, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 50 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 50 ring-forming carbon atoms, and/or bonded to an adjacent group to form a ring,
a is an integer of 0 to 4,
b is an integer of 0 to 3,
c is an integer of 0 to 2,
d is an integer of 0 to 4,
e is an integer of 0 to 2,
f is an integer of 0 to 4,
g is an integer of 0 to 3, and
h is an integer of 0 to 4.

2. The light emitting diode of claim 1 , wherein the at least one functional layer comprises an emission layer, a hole transport region between the first electrode and the emission layer, and an electron transport region between the emission layer and the second electrode, and
wherein the emission layer comprises the condensed polycyclic compound.

3. The light emitting diode of claim 2 , wherein the emission layer comprises a dopant and a host, and
the dopant comprises the condensed polycyclic compound.

4. The light emitting diode of claim 2 , wherein the emission layer is configured to emit blue light.

5. The light emitting diode of claim 2 , wherein the emission layer is configured to emit thermally activated delayed fluorescence.

6. The light emitting diode of claim 2 , wherein the electron transport region comprises Compound G:

7. The light emitting diode of claim 1 , wherein X 1 is the same as X 3 , and X 2 is the same as X 4 .

8. The light emitting diode of claim 1 , wherein the condensed polycyclic compound represented by Formula 1 is represented by any one of Formulae 2-1 to 2-3:

wherein in Formulae 2-1 to 2-3,
R xy and R xz are each independently a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted silyl group, a substituted or unsubstituted amine group, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 50 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 50 ring-forming carbon atoms, and/or bonded to an adjacent group to form a ring, and
R 1 to R 8 , and a to h are the same as defined in Formula 1.

9. The light emitting diode of claim 1 , wherein the condensed polycyclic compound represented by Formula 1 is represented by Formula 3-1 or Formula 3-2:

wherein in Formulas 3-1 and 3-2,
R X1 and R X2 are each independently a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted silyl group, a substituted or unsubstituted amine group, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 50 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 50 ring-forming carbon atoms, and/or bonded to an adjacent group to form a ring,
R X3 and R X4 are each independently a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted silyl group, a substituted or unsubstituted amine group, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 50 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 50 ring-forming carbon atoms,
m and n are each independently an integer of 0 to 4, and
X 2 , X 4 , R 1 to R 8 , and a to h are the same as defined in Formula 1.

10. The light emitting diode of claim 1 , wherein the condensed polycyclic compound represented by Formula 1 is represented by Formula 4-1:

wherein in Formula 4-1,
X 1 , X 2 , X 3 , X 4 , R 1 , R 2 , R 6 , R 7 , a, b, f, and g are the same as defined in Formula 1.

11. The light emitting diode of claim 1 , wherein the condensed polycyclic compound represented by Formula 1 is represented by Formula 5-1:

wherein in Formula 5-1,
X 1 , X 2 , X 3 , X 4 , R 1 , R 2 , and R 6 are the same as defined in Formula 1.

12. The light emitting diode of claim 1 , wherein X 1 , X 2 , R 1 , R 2 , R 3 , R 4 , a, b, c, and d are the same as X 3 , X 4 , R 6 , R 7 , R 5 , R 8 , f, g, e, and h, respectively.

13. The light emitting diode of claim 1 , wherein R X , and R 1 to R 8 are each independently a hydrogen atom, a deuterium atom, a t-butyl group, a substituted or unsubstituted diphenylamine group, a substituted or unsubstituted phenyl group, a substituted or unsubstituted biphenyl group, a substituted or unsubstituted carbazole group, and/or bonded to an adjacent group to form a ring.

14. The light emitting diode of claim 1 , wherein the condensed polycyclic compound represented by Formula 1 comprises any one of compounds in Compound Group 1:

Assignees

• Samsung Display Co Ltd

Inventors

• Oh Chanseok
• Kim Taeil
• Pak Sun Young
• Park Junha
• Baek Jang Yeol
• Sunwoo Kyoung
• Sim Mun-Ki
• Jung Minjung

Classifications

• H10K85/322 Primary

  comprising boron · CPC title

• H10K85/658 Primary

  Organoboranes · CPC title

• H10K2101/20

  Delayed fluorescence emission · CPC title

• H10K50/155

  comprising dopants · CPC title

• C09K2211/1018

  Heterocyclic compounds · CPC title