Quantum dot composition and light emitting diode having a ligand with head part that has an acid group combined with surface of a quantum dot

Patent metadata

Field	Value
Publication number	US-11569467-B2
Application number	US-202016920730-A
Country	US
Kind code	B2
Filing date	Jul 5, 2020
Priority date	Aug 5, 2019
Publication date	Jan 31, 2023
Grant date	Jan 31, 2023

Abstract

A quantum dot composition of an embodiment includes: a quantum dot; a ligand combined with a surface of the quantum dot; and a ligand scavenger having a nucleophilic reaction group.

First claim

What is claimed is:

1. A quantum dot composition comprising:
a quantum dot;
a ligand combined with a surface of the quantum dot; and
a ligand scavenger having a nucleophilic reaction group,
wherein the ligand comprises:
a head part combined with the surface of the quantum dot;
a tail part comprising an alkyl group of 1 to 20 carbon atoms; and
wherein the head part has a dithio acid group or a carboxylic acid group.

2. The quantum dot composition of claim 1 , wherein the ligand comprises at least one of HO(O)—C—NH—R, HS(S)—C—NH—R, HO(O)—C—N-R 2 , HS(S)—C—N—R 2 , HO(O)—C—O—R, HS(S)—C—O—R, HO(O)—C—[C(O)O—C(O)O] n —H, or HS(S)—C[C(O)O—C(O)O] n —H, where R is an alkyl group of 1 to 20 carbon atoms, and n is an integer of 1 to 10.

3. The quantum dot composition of claim 1 , wherein the ligand scavenger comprises at least one of NH 2 —R a , NH—(R a ) 2 , N—(R a ) 3 , OH—R a , or O—(R a ) 2 , where R a is an alkyl group of 1 to 20 carbon atoms.

4. The quantum dot composition of claim 1 , further comprising an organic solvent.

5. The quantum dot composition of claim 1 , wherein the ligand scavenger is configured to induce a nucleophilic attack reaction on the ligand.

6. The quantum dot composition of claim 1 , wherein the quantum dot comprises a semiconductor nanocrystal including a core and a shell wrapping the core.

7. A quantum dot composition comprising:
a quantum dot;
a ligand combined with a surface of the quantum dot; and
a ligand scavenger having a nucleophilic reaction group,
wherein the ligand scavenger and the ligand have a molar ratio of at least about 1:1, wherein the moles of the ligand scavenger exceed the moles of the ligand.

8. A light emitting diode comprising:
a first electrode;
a hole transport region disposed on the first electrode;
an emission layer disposed on the hole transport region and comprising a modified quantum dot having a hydrophilic group;
an electron transport region disposed on the emission layer; and
a second electrode disposed on the electron transport region,
wherein
the emission layer is made from a quantum dot composition comprising a quantum dot, a ligand combined with a surface of the quantum dot, and a ligand scavenger having a nucleophilic reaction group,
the ligand comprises at least one of HO(O)—C—NH—R, HS(S)—C—NH—R, HO(O)—C—N—R 2 , HS(S)—C—N—R 2 , HO(O)—C—O—R, HS(S)—C—O—R, HO(O)—C—[C(O)O—C(O)O] n —H, or HS(S)—C—[C(O)O—C(O)O] n —H, where: R is an alkyl group of 1 to 20 carbon atoms, and n is an integer of 1 to 10; and
the ligand scavenger comprises at least one of NH 2 —R a , NH—(R 2 ) 2 , N—(R 2 ) 1 , OH—R a , or 0-(R a ) 2 , where: R a is an alkyl group of 1 to 20 carbon atoms.

9. The light emitting diode of claim 8 , wherein the modified quantum dot comprises:
a quantum dot comprising a core and a shell wrapping the core; and
the hydrophilic group which is combined with a surface of the quantum dot.

10. The light emitting diode of claim 8 , wherein the hydrophilic group comprises a thiol group or a hydroxyl group.

11. The light emitting diode of claim 8 , wherein the emission layer further comprises a residue made by reacting the ligand and the ligand scavenger.

12. The light emitting diode of claim 11 , wherein the residue comprises a diamine compound or a dialkoxy compound.

Assignees

• Samsung Display Co Ltd

Inventors

• Jung Yunku

Classifications

• H01L27/3211

  Electricity · mapped topic

• C09K2211/18

  Metal complexes · CPC title

• H01L51/0077

  Electricity · mapped topic

• H01L51/502 Primary

  Electricity · mapped topic

• H01L51/56

  Electricity · mapped topic