# US 2023/0165028 A1 · Quantum dot-ligand composite, photosensitive resin composition, optical film, electroluminescent diode, and electronic device

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- Number: US 2023/0165028 A1
- Document ID: US20230165028A1
- Status: Published application
- Kind: A1
- Application number: 18/053,412
- Filed: 2022-11-08
- Published: 2023-05-25
- Earliest claimed: 2021-11-22
- Assignees: Duk San Neolux Co., Ltd.
- Applicants: Duk San Neolux Co., Ltd.
- Inventors: Tae Yun KIM; Jong Moon SHIN; Changmin LEE; Kyung Soo KIM
- Web page: https://patentgrep.com/patent/US20230165028A1

## CPC

- H10K 50/115: comprising active inorganic nanostructures, e.g. luminescent quantum dots
- B82Y 20/00: Nanooptics, e.g. quantum optics or photonic crystals
- C09K 11/02: Use of particular materials as binders, particle coatings or suspension media therefor
- C09K 11/025: {non-luminescent particle coatings or suspension media}
- C09K 11/08: containing inorganic luminescent materials
- C09K 11/562: {Chalcogenides}
- C09K 11/621: {Chalcogenides}
- C09K 11/623: {with zinc or cadmium}
- C09K 11/625: {with alkaline earth metals}
- C09K 11/641: {Chalcogenides}
- C09K 11/642: {with zinc or cadmium}
- C09K 11/643: {with alkaline earth metals}
- C09K 11/661: {Chalcogenides}
- C09K 11/701: {Chalcogenides}
- C09K 11/703: {with zinc or cadmium}
- C09K 11/71: also containing alkaline earth metals
- C09K 11/7407: {Chalcogenides}
- C09K 11/7414: {with zinc or cadmium}
- C09K 11/7421: {with alkaline earth metals}
- C09K 11/881: {Chalcogenides}
- C09K 11/883: {with zinc or cadmium}
- C09K 11/885: {with alkaline earth metals}
- B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites
- H10K 2102/351: {Thickness}
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

## Abstract

Provided are a quantum dot-ligand composite which includes quantum dots including a semiconductor nanocrystalline core that includes Group III and V elements and a semiconductor nanocrystalline shell that is disposed on the semiconductor nanocrystalline core and includes Group II and VI elements; and organic ligands coordinated to the quantum dots. Additionally, a quantum dot-ligand composite with high luminescence properties and stability according to the electrostatic effective binding ratio between the quantum dots and the organic ligands bound to the surface of the quantum dots, and a photosensitive resin composition, optical film, electroluminescent diode, and electronic device including the same can be provided.

## Claims

### Claim 1

A quantum dot-ligand composite, which comprises quantum dots comprising a semiconductor nanocrystalline core that comprises Group III and V elements and a semiconductor nanocrystalline shell that is disposed on the semiconductor nanocrystalline core and comprises Group II and VI elements; and organic ligands coordinated to the quantum dots;
wherein the quantum dots show a maximum photoluminescence peak in a wavelength region between 500 nm and 650 nm; and
the effective binding ratio (EBR) of the quantum dots and the organic ligands defined by the following [Equation 1] is 0.1 to 0.6:
EBR
=
C
l
i
g
a
n
d
C
Q
D
=
m
l
i
g
a
n
d
M
l
i
g
a
n
d
×
c
l
i
g
a
n
d
m
Q
D
M
Q
D
×
c
n
e
t
wherein:
CQD is the total amount of the positive charge of the quantum dot nanocrystals determined by the inorganic elements constituting the quantum dots;
Cligand is the total amount of the negative charge of the organic ligands bound to the quantum dot surface to electrically stabilize the quantum dots;
mligand is the mass ratio of the organic ligands to the total amount of the quantum dots and the organic ligands;
mQD is the mass ratio of the inorganic semiconductor nanoparticles constituting the quantum dots to the total amount of the quantum dots and the organic ligands;
MQD is the average molar mass of the quantum dots determined by the inorganic elements constituting the quantum dots;
Mligand is the molecular weight of the organic ligands coordinated to the quantum dots;
cnet is the net charge per mole of the quantum dots determined by the inorganic elements constituting the quantum dots; and
cligand is the amount of charge possessed by the organic ligands in a coordinated state.

### Claim 2 (depends on 1)

The quantum dot-ligand composite of claim 1, wherein the weight ratio of the organic ligands to the inorganic nanoparticles in the quantum dot-ligand composite is 1.5 to 19.

### Claim 3 (depends on 1)

The quantum dot-ligand composite of claim 1, wherein the average molar mass of the quantum dots derived through the inorganic elements constituting the quantum dots is 40 g/mol to 100 g/mol.

### Claim 4 (depends on 1)

The quantum dot-ligand composite of claim 1, wherein the molecular weight of the organic ligands coordinated to the quantum dots is 40 g/mol to 350 g/mol.

### Claim 5 (depends on 1)

The quantum dot-ligand composite of claim 1, wherein the Group III elements of the quantum dots comprise one or more among In, Ga, and Al.

### Claim 6 (depends on 1)

The quantum dot-ligand composite of claim 1, wherein the Group V elements of the quantum dots comprise one or more among P, As, Sb, Bi, and N.

### Claim 7 (depends on 1)

The quantum dot-ligand composite of claim 1, wherein the Group II elements of the quantum dots comprise one or more among Mg, Ca, Zn, Mn, Cu, Co, Hg, and Pb.

### Claim 8 (depends on 1)

The quantum dot-ligand composite of claim 1, wherein the Group VI elements of the quantum dots comprise one or more among S, Se, and Te.

### Claim 9 (depends on 1)

The quantum dot-ligand composite of claim 1, wherein the quantum dots have a particle diameter of 1 nm to 30 nm.

### Claim 10 (depends on 1)

A photosensitive resin composition comprising:
(A) the quantum dot-ligand composite of claim 1;
(B) a photo-crosslinkable monomer; and
(C) an initiator.

### Claim 11 (depends on 10)

The photosensitive resin composition of claim 10, further comprising a light diffusion agent.

### Claim 12 (depends on 10)

The photosensitive resin composition of claim 10, wherein the photosensitive resin composition comprises, relative to the total amount of the photosensitive resin composition:
(A) 10 wt% to 60 wt% of the quantum dot-ligand composite;
(B) 30 wt% to 90 wt% of the photo-crosslinkable monomer; and
(C) 0.1 wt% to 10 wt% of the initiator.

### Claim 13 (depends on 1)

An optical film comprising the quantum dot-ligand composite of claim 1 and having a thickness of 0.005 µm to 500 µm.

### Claim 14 (depends on 13)

An electroluminescent diode comprising the optical film of claim 13.

### Claim 15 (depends on 13)

An electronic device comprising:
a display device comprising the optical film of claim 13; and
a control unit for operating the display device.

### Claim 16 (depends on 14)

An electronic device comprising:
a display device comprising the electroluminescent diode of claim 14; and
a control unit for operating the display device.