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Quantum dot ink, preparation method of quantum dot light emitting diode and display device

A quantum dot light-emitting and quantum dot technology, which is applied in the manufacturing and application of inks, semiconductor/solid-state devices, etc., can solve the problems of low film formation uniformity, low viscosity of quantum dot ink, and poor dispersion, so as to improve the film formation uniformity. , stable photoelectric performance, effective charge transfer effect

Pending Publication Date: 2021-04-13
GUANGDONG JUHUA PRINTING DISPLAY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Quantum dot inks usually disperse quantum dot materials directly in solvents. Currently, commonly used solvents include toluene, chloroform, and long alkane alcohol solvents. Among them, toluene and chloroform have relatively good dispersion stability, but the quantum dots obtained based on this The viscosity of the dot ink is generally small, and the boiling point is very low; the quantum dot ink made of long alkane alcohol solvent has a high viscosity, but the dispersion is poor, the uniformity of film formation is low, and the polymer additive with insulating properties The introduction often also reduces the charge transport capability of the light-emitting layer film, affecting the photoelectric performance of the light-emitting layer

Method used

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  • Quantum dot ink, preparation method of quantum dot light emitting diode and display device
  • Quantum dot ink, preparation method of quantum dot light emitting diode and display device
  • Quantum dot ink, preparation method of quantum dot light emitting diode and display device

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preparation example Construction

[0061] Based on the above embodiments, the present invention further proposes a method for preparing a quantum dot light-emitting diode, the method for preparing a quantum dot light-emitting diode includes the following steps:

[0062] In step S10, inkjet printing is performed using quantum dot ink to form an ink layer.

[0063] In this embodiment, an inkjet printer is selected to inkjet print the ink layer on the substrate, wherein the ink used is the quantum dot ink described above, which has all the technical solutions of the above-mentioned embodiments, and at least has the advantages of the above-mentioned embodiments All beneficial effects brought by the technical solution will not be repeated here.

[0064] Further, in order to make the quantum dot ink release properly from the nozzle of the inkjet print head without clogging, adjust the amount of each component in the quantum dot ink so that the viscosity of the ink is between 0.5cPs and 0.5cPs at room temperature (25~...

Embodiment 1

[0072] (1) Quantum dot ink formula: quantum dot materials and organic solvents, wherein the quantum dot materials are red CdSe / ZnS quantum dots stabilized by oleylamine; organic solvents include decahydronaphthalene and acrylate organic solvents (isodecyl acrylate) , The boiling point of isodecyl acrylate is 270.9°C, the viscosity at 25°C is 8cPs, and the surface tension is about 28.7mN / m.

[0073] (2) Decalin and isodecyl acrylate are dewatered and deoxygenated respectively, and refined to a purity greater than 99.9%. Under stirring conditions, 10wt% oleylamine-stabilized red CdSe / ZnS quantum dots, 50wt% decahydronaphthalene and 40wt% isodecyl acrylate were sequentially added to a 500mL single-necked flask, and stirred and mixed for 30min to obtain a quantum dot ink. The viscosity of the dot ink at 25-35°C is 4-6cPs, and the surface tension is 25-28mN / m.

[0074] (3) Use an inkjet printer to print the above-mentioned quantum dot ink into a red quantum dot ink layer of 20×30u...

Embodiment 2

[0076] (1) Quantum dot ink formula: quantum dot material and organic solvent, wherein, quantum dot material is the green CdZnSe / CdZnS quantum dot that oleylamine stabilizes; Organic solvent includes hexadecane, dicyclohexyl and acrylate organic solvent ( octyl acrylate), the boiling point of octyl acrylate is 215°C, the viscosity at 25°C is 5cp, and the surface tension is about 28mN / m.

[0077] (2) Hexadecane, dicyclohexyl and octyl acrylate are dehydrated and deoxygenated respectively, and refined to a purity greater than 99.9%. Under stirring conditions, 10wt% oleylamine-stabilized green CdZnSe / CdZnS quantum dots, 20%wt hexadecane, 40wt% dicyclohexyl and 30wt% octyl acrylate were sequentially added to a 500mL single-necked flask, stirred and mixed for 30min, The quantum dot ink is obtained, and the viscosity of the quantum dot ink is 4.5-6cp at a temperature of 25-35°C, and the surface tension is 30-32mN / m.

[0078] (3) Use an inkjet printer to print the above-mentioned qua...

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Abstract

The invention discloses quantum dot printing ink, a preparation method of a quantum dot light emitting diode and a display device; the quantum dot printing ink comprises an organic solvent, the organic solvent comprises an acrylate organic solvent, and the acrylate organic solvent comprises at least one compound with a structure represented by a structural general formula (I). The quantum dot ink provided by the invention has the advantages of proper viscosity and surface tension, good dispersion stability, good volatility and the like, a light-emitting layer in a light-emitting diode can be prepared in an ink-jet printing mode, and a quantum dot light-emitting layer without ink organic substances can be obtained after volatilization treatment.

Description

technical field [0001] The invention relates to the technical field of quantum dot products, in particular to a quantum dot ink, a method for preparing a quantum dot light-emitting diode and a display device. Background technique [0002] In recent years, quantum dot (QD) luminescent materials have played a great role in LED lighting, liquid crystal display and other fields. Quantum dots replace traditional phosphors, effectively improving the color gamut of LED and liquid crystal display. The solution processing characteristics of quantum dots make the quantum dot light-emitting layer can be prepared by various methods such as spin coating, scraping coating, spraying, and inkjet printing. Compared with several other methods, inkjet printing technology can accurately deposit the quantum dot luminescent material in the appropriate position according to the required amount, so that the semiconductor material can be uniformly deposited to form a thin film layer, and the utiliza...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D11/36C09D11/38H01L51/56
CPCC09D11/36C09D11/38H10K71/135H10K71/15
Inventor 李雪
Owner GUANGDONG JUHUA PRINTING DISPLAY TECH CO LTD