Quantum dot film, display panel and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-11834595-B2
Application number	US-202117352478-A
Country	US
Kind code	B2
Filing date	Jun 21, 2021
Priority date	Oct 23, 2020
Publication date	Dec 5, 2023
Grant date	Dec 5, 2023

Abstract

A method for manufacturing a quantum dot film is provided. A substrate plate is provided. A plurality of quantum dot material layers capable of emitting light having different colors are sequentially formed on the substrate plate, wherein at least one of the quantum dot material layers includes a plurality of quantum dots. A local crosslinking process is performed on at least one of the quantum dot material layers, so as to crosslink the crosslinkable ligands in a region emitting light having a corresponding color in the quantum dot material layer. A fluorescence quenching process is performed on the quantum dot material layer subjected to the local crosslinking process, so as to quench the fluorescence of quantum dots outside the region emitting light having the corresponding color in the quantum dot material layer. A display panel and a method for manufacturing the same are also provided.

First claim

The invention claimed is:

1. A method for manufacturing a quantum dot film, comprising:
providing a substrate plate;
sequentially forming a plurality of quantum dot material layers capable of emitting light having different colors on the substrate plate, wherein at least one of the quantum dot material layers comprises a plurality of quantum dots, and the quantum dots comprise a quantum dot body and a crosslinkable ligand attached to the quantum dot body through a coordinate bond;
performing a local crosslinking process on the at least one of the quantum dot material layers, so as to crosslink the crosslinkable ligand in a region emitting a light having a corresponding color in the quantum dot material layer; and
performing a fluorescence quenching process on the quantum dot material layer subjected to the local crosslinking process, so as to quench fluorescence of the quantum dots outside the region emitting the light having the corresponding color in the quantum dot material layer,
wherein projections of the regions emitting the light having the corresponding color in each of the quantum dot material layers on the substrate plate do not overlap with each other.

2. The method of claim 1 , wherein in the step of performing the local crosslinking process on the quantum dot material layer, the crosslinkable ligand forms a crosslinked network structure on the surface of the quantum dot body after being crosslinked.

3. The method of claim 1 , wherein the crosslinkable ligand comprises a coordinating group, a carbon chain, and a crosslinkable functional group, with both of the coordinating group and the crosslinkable functional group being covalently attached to the carbon chain, and the coordinating group being attached to the quantum dot body through a coordinate bond.

4. The method of claim 3 , wherein the crosslinkable functional group is a photocrosslinkable functional group; the different colors include a first color, a second color, and a third color; and the step of performing the local crosslinking process on the quantum dot material layer comprises:
providing a mask plate above the quantum dot material layer, wherein the mask plate comprises a light transmitting portion and a light shading portion, with the light transmitting portion facing opposite to a region emitting the light having the first color in the quantum dot material layer, and the light shading portion facing opposite to regions emitting lights having the second color and the third color in the quantum dot material layer; and
irradiating the mask plate with light, such that the light reaches the region emitting the light having the first color through the light transmitting portion to crosslink the crosslinkable ligand in the region emitting the light having the first color.

5. The method of claim 4 , wherein the crosslinkable functional group is at least one selected from a double bond, an epoxy group, a carboxyl group, a thiol group, an amino group and a hydroxyl group.

6. The method of claim 3 , wherein the carbon chain has a length of not less than 4 carbon atoms.

7. The method of claim 6 , wherein the carbon chain further comprises a branch chain having 1 to 18 carbon atoms.

8. The method of claim 1 , wherein the step of performing the fluorescence quenching process on the quantum dot material layer subjected to the local crosslinking process comprises:
performing an ion exchange process on the quantum dot material layer subjected to the local crosslinking process by using a solution with metal cations, so as to quench the fluorescence of quantum dots outside the region emitting the light having the corresponding color in the quantum dot material layer.

9. The method of claim 8 , wherein the quantum dot body comprises a core-shell structure, and after the step of performing the ion exchange process on the quantum dot material layer subjected to the local crosslinking process by using the solution with metal cations, cations of the quantum dot shell of the quantum dot body are replaced by the metal cations, and/or cations of the quantum dot core of the quantum dot body are replaced by the metal cations.

10. The method of claim 8 , wherein the metal cation is at least one selected from:
Fe 3+ , Cu + , Co 2+ , Ni 2+ , Ag + , Mo 6+ , Na + , K + , Cs + , Ba 2+ , Ca 2+ , Hg 2+ , Sn 2+ , and Pb 2+ .

11. The method of claim 1 , wherein the plurality of quantum dot material layers comprise a quantum dot material layer emitting red light, a quantum dot material layer emitting green light, and a quantum dot material layer emitting blue light, and the method comprises:
forming a first quantum dot material layer emitting red light on the substrate plate;
performing the local crosslinking process on the first quantum dot material layer, so as to crosslink the crosslinkable ligand in a region emitting red light in the first quantum dot material layer;
performing the fluorescence quenching process on the first quantum dot material layer subjected to the local crosslinking process, so as to quench the fluorescence of quantum dots outside the region emitting red light in the first quantum dot material layer, thereby forming a first layer;
forming a second quantum dot material layer emitting green light on the first layer;
performing the local crosslinking process on the second quantum dot material layer, so as to crosslink the crosslinkable ligands in a region emitting green light in the second quantum dot material layer;
performing the fluorescence quenching process on the second quantum dot material layer subjected to the local crosslinking process, so as to quench the fluorescence of quantum dots outside the region emitting green light in the second quantum dot material layer, thereby forming a second layer;
forming a third quantum dot material layer emitting blue light on the second layer;
performing the local crosslinking process on the third quantum dot material layer, so as to crosslink the crosslinkable ligands in a region emitting blue light in the third quantum dot material layer; and
performing the fluorescence quenching process on the third quantum dot material layer subjected to the local crosslinking process, so as to quench the fluorescence of quantum dots outside the region emitting blue light in the third quantum dot material layer, thereby forming a third layer.

12. A method for manufacturing a display panel, comprising:
providing a substrate plate, wherein a pixel defining layer is formed on the substrate plate, the pixel defining layer defines a plurality of pixel units, and each of pixel units comprises a plurality of sub-pixel units corresponding to different colors;
forming a plurality of light emitting elements capable of emitting a light having a plurality of different colors on the substrate plate formed with the pixel defining layer, wherein each light emitting element comprises quantum dot material layers, at least one of the quantum dot material layers comprises a plurality of quantum dots, and the quantum dot comprises a quantum dot body and a crosslinkable ligand attached to the quantum dot body through a coordinate bond;
performing a local crosslinking process on the at least one of the quantum dot material layers, so as to crosslink the crosslinkable ligand in the sub-pixel unit of corresponding color in the quantum dot material layer; and
performing a fluorescence quenching process on the quantum dot material layer subjected to the local crosslinking process, so as to quench the fluorescence of quantum dots outside the sub-pixel unit of corresponding color in the quantum dot material layer, wherein projections of the regions emitting a light having corresponding colors in

Assignees

• Boe Technology Group Co Ltd

Inventors

• Zhang Xiaoyuan

Classifications

• C09K11/565 Primary

  with zinc cadmium · CPC title

• C01B19/04

  Binary compounds {including binary selenium-tellurium compounds (C01B19/004, C01B19/005, C01B19/007 take precedence)} · CPC title

• C01G9/08

  Sulfides · CPC title

• B82Y20/00

  Nanooptics, e.g. quantum optics or photonic crystals · CPC title

• B82Y30/00

  Nanotechnology for materials or surface science, e.g. nanocomposites · CPC title