US-12617965-B2 - Quantum dot ink, quantum dot film, preparation method thereof and display substrate

Abstract

A quantum dot ink, a quantum dot film, a preparation method thereof and a display substrate are provided in the present disclosure, which relates to a technical field of displaying. The quantum dot ink includes: a first ink including at least a quantum dot body and a ligand coordinated on a surface of the quantum dot body, the ligand including an R1 group; and a second ink including at least a reactive compound, the reactive compound being configured for being capable of interacting with the R1 group and cause the quantum dot body to deposit to form a film. The quantum dot film prepared by the quantum dot ink has good film-forming uniformity, thus improving display effect of the display product prepared by the quantum dot film.

Inventors

• Tieshi WANG

Assignees

• Beijing Boe Technology Development Co., Ltd.
• BOE TECHNOLOGY GROUP CO., LTD.

Dates

Publication Date

20260505

Application Date

20210820

Claims (18)

1. 1 . A quantum dot ink, comprising: a first ink including at least a quantum dot body and a ligand coordinated on a surface of the quantum dot body, the ligand including an R1 group; and a second ink including at least a reactive compound, the reactive compound being configured for being capable of interacting with the R1 group and cause the quantum dot body to deposit to form a film; wherein the first ink further includes a first solvent and the second ink further includes a second solvent; wherein a product after interaction between the reactive compound and the R1 group is coordinated on the quantum dot body, and the product is insoluble in the first solvent and the second solvent.
2. 2 . The quantum dot ink according to claim 1 , wherein a molecular weight of the product is larger than a molecular weight of the reactive compound.
3. 3 . The quantum dot ink according to claim 1 , wherein a polarity of the product is different from a polarity of the first solvent, and the polarity of the product is further different from a polarity of the second solvent.
4. 4 . The quantum dot ink according to claim 1 , wherein interaction between the reactive compound and the R1 group includes one of cross-linking reaction, electrostatic adsorption and hydrogen bonding.
5. 5 . The quantum dot ink according to claim 1 , wherein the polarity of the first solvent is different from the polarity of the second solvent.
6. 6 . The quantum dot ink according to claim 1 , wherein the R1 group includes a group with a sulfhydryl group or a group with an amino group.
7. 7 . The quantum dot ink according to claim 1 , wherein the reactive compound includes a polymaleimide compound or polysuccinimide compound.
8. 8 . The quantum dot ink according to claim 7 , wherein the polymaleimide compound includes a bismaleimide compound or a trimaleimide compound; and the polysuccinimide compound include a bissuccinimide compound or a trisuccinimide compound.
9. 9 . The quantum dot ink according to claim 8 , wherein the bismaleimide compound includes: the trimaleimide compound includes: the bissuccinimide compound includes: and the trisuccinimide compound includes:
10. 10 . The quantum dot ink according to claim 1 , wherein when the R1 group includes a group with a sulfhydryl group, the reactive compound includes a polymaleimide compound, and the second solvent includes acetone, chloroform, toluene and N-methylpyrrolidone; and when the R1 group includes a group with an amino group, the reactive compound includes a polysuccinimide compound, and the second solvent includes diethylene glycol, triethylene glycol, diethylene glycol dimethyl ether, dimethyl sulfoxide and dimethylformamide.
11. 11 . The quantum dot ink according to claim 1 , wherein the product coordinated on the quantum dot body includes:
12. 12 . A quantum dot film, comprising the quantum dot body in the quantum dot ink according to claim 1 , and a product after interaction between the R1 group and the reactive compound, the product being coordinated on at least a part of the quantum dot body.
13. 13 . The quantum dot film according to claim 12 , further comprising the reactive compound and the ligand coordinated on the surface of the quantum dot body.
14. 14 . A display substrate, comprising the quantum dot film according to claim 12 .
15. 15 . A method for preparing a quantum dot film, comprising: providing a substrate; spraying a first ink on the substrate, the first ink including at least a quantum dot body and a ligand coordinated on a surface of the quantum dot body, the ligand including an R1 group; spraying a second ink on the substrate, the second ink including at least a reactive compound and the reactive compound being configured for being capable of interacting with the R1 group and cause the quantum dot body to deposit to form the film; standing for a predetermined time; and carrying out drying treatment; wherein the first ink further includes a first solvent and the second ink further includes a second solvent; wherein a product after interaction between the reactive compound and the R1 group is coordinated on the quantum dot body, and the product is insoluble in the first solvent and the second solvent.
16. 16 . The method for preparing the quantum dot film according to claim 15 , wherein a molecular weight of the product is larger than a molecular weight of the reactive compound.
17. 17 . The method for preparing the quantum dot film according to claim 15 , wherein a polarity of the product is different from a polarity of the first solvent, and the polarity of the product is further different from a polarity of the second solvent.
18. 18 . The method for preparing the quantum dot film according to claim 15 , wherein interaction between the reactive compound and the R1 group includes one of cross-linking reaction, electrostatic adsorption and hydrogen bonding.

Description

TECHNICAL FIELD The disclosure relates to a technical field of displaying, and more particularly, to a quantum dot ink, a quantum dot film, a preparation method thereof and a display substrate. BACKGROUND A QD (Quantum Dot) is a new type of nanomaterial, with a crystal diameter between 2 and 20 nanometers, and it can emit monochromatic light with a concentrated energy spectrum and high quality after being excited. By applying quantum dot technologies to a display product, displaying with a wider color gamut can be achieved and a precise color control can be realized. Currently, quantum dot inks are used to form films by ink-jet printing in display products. However, during drying and forming of the films, the quantum dot inks are prone to Marangoni effect, coffee-ring effect or climbing phenomenon, resulting in poor film-forming uniformity of the quantum dot films, thus reducing display effect of the display products made of the quantum dot films. SUMMARY Embodiments of the disclosure incorporate following technical schemes. In an aspect, a quantum dot ink is provided in an embodiment of the present disclosure, comprising: a first ink including at least a quantum dot body and a ligand coordinated on a surface of the quantum dot body, the ligand including an R1 group; anda second ink including at least a reactive compound, the reactive compound being configured for being capable of interacting with the R1 group and cause the quantum dot body to deposit to form a film. In some embodiments, the first ink further includes a first solvent and the second ink further includes a second solvent; wherein a product after interaction between the reactive compound and the R1 group is coordinated on the quantum dot body, and the product is insoluble in the first solvent and the second solvent. In some embodiments, a molecular weight of the product is larger than a molecular weight of the reactive compound. In some embodiments, a polarity of the product is different from a polarity of the first solvent, and the polarity of the product is further different from a polarity of the second solvent. In some embodiments, interaction between the reactive compound and the R1 group includes one of cross-linking reaction, electrostatic adsorption and hydrogen bonding. In some embodiments, the polarity of the first solvent is different from the polarity of the second solvent. In some embodiments, the R1 group includes a group with a sulfhydryl group or a group with an amino group. In some embodiments, the reactive compound includes a polymaleimide compound or polysuccinimide compound. In some embodiments, the polymaleimide compound includes a bismaleimide compound or a trimaleimide compound; and the polysuccinimide compound include a bissuccinimide compound or a trisuccinimide compound. In some embodiments, the bismaleimide compound includes: the trimaleimide compound includes: the bissuccinimide compound includes: and the trisuccinimide compound includes: In some embodiments, when the R1 group includes a group with a sulfhydryl group, the reactive compound includes a polymaleimide compound, and the solvent of the second ink includes acetone, chloroform toluene and N-methylpyrrolidone; and when the R1 group includes a group with an amino group, the reactive compound includes a polysuccinimide compound, and the solvent of the second ink includes diethylene glycol, triethylene glycol, diethylene glycol dimethyl ether, dimethyl sulfoxide and dimethylformamide. In another aspect, a quantum dot film is further provided in an embodiment of the present disclosure, comprising the quantum dot body in the quantum dot ink described above, and a product after interaction between the R1 group and the reactive compound, the product being coordinated on at least a part of the quantum dot body. In some embodiments, quantum dot film further comprises the reactive compound and the ligand coordinated on the surface of the quantum dot body. In some embodiments, the product coordinated on the quantum dot body includes: In another aspect, the present disclosure further provides a display substrate, comprising the quantum dot film described above. In yet another aspect, the present disclosure further provides a method for preparing a quantum dot film, comprising: providing a substrate;spraying a first ink on the substrate, the first ink including at least a quantum dot body and a ligand coordinated on a surface of the quantum dot body, the ligand including an R1 group;spraying a second ink on the substrate, the second ink including at least a reactive compound and the reactive compound being configured for being capable of interacting with the R1 group and cause the quantum dot body to deposit to form the film;standing for a predetermined time; andcarrying out drying treatment. In some embodiments, the first ink further includes a first solvent and the second ink further includes a second solvent; wherein a product after interaction between the reactive co