Printing method of quantum dot ink

A quantum dot and ink technology, applied in the field of quantum dot ink printing, can solve the problems of poor definition and uniformity of printing patterns, and achieve the effect of simplifying the solvent system

Active Publication Date: 2020-01-24
NANJING TECH CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The main purpose of the present invention is to provide a printing method of quantum dot ink to solve the problem of poor clarity and uniformity of printed patterns in the existing quantum dot printing method

Method used

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  • Printing method of quantum dot ink
  • Printing method of quantum dot ink
  • Printing method of quantum dot ink

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preparation example Construction

[0037] In a preferred embodiment, the preparation method of the above-mentioned quantum dot ink includes: in the presence of a weakly alkaline solvent, subjecting the secondary quantum dot solution and the surfactant to a surface modification reaction and separating and purifying to obtain the first The first quantum dot and the second solvent form a dispersion liquid to obtain the quantum dot ink.

[0038] The surface modification reaction of the secondary quantum dot solution and the surfactant is carried out, so that the solubility of the secondary quantum dot solution is changed into primary quantum dots. Adding a weakly basic solvent to the above surface modification reaction is beneficial to further improving the reaction speed of the surface modification reaction and shortening the process time. At the same time, the quantum dot ink prepared by the above method has high stability, and the preparation process is relatively simple.

[0039] In a preferred embodiment, the...

Embodiment 1

[0049] Prepare water-soluble quantum dot ink:

[0050] Mix and stir 10mL oil-soluble quantum dot solution (solvent is toluene, 80mg / mL) and ethanol solution of 40mL surfactant phosphatidylethanolamine (200mg / mL) to obtain a mixed solution. The time is 30min, and the stirring temperature is 30°C. Then, 60 mL of ammonia water (concentration of the original ammonia water was 28 wt%, obtained by diluting 15 times with ethanol) was added to the above mixed solution, and stirring was continued for 60 min at a stirring temperature of 30°C. After the reaction was complete, the supernatant was removed by centrifugation to obtain a precipitate. After shaking and dispersing the obtained precipitate with hexane and methyl ethyl ketone (1:1), remove the supernatant again, keep the precipitate, repeat 1 to 3 times, and finally use propylene glycol methyl ether and ethylene glycol (volume 6:4) Mix and dissolve, and prepare a dispersed precipitate at a concentration of 80 mg / mL to obtain a w...

Embodiment 2

[0058] Prepare water-soluble quantum dot ink with embodiment 1.

[0059] Prepare the breaker solution: Dissolve the selected breaker in the same solvent as the ink (propylene glycol methyl ether: ethylene glycol (6:4) mixed solution) to prepare a 200mg / mL solution. The functional component of the breaking agent of this embodiment is methyl trioctyl ammonium chloride.

[0060] The preparation method of quantum dot luminescent layer is as follows:

[0061] S1 and S3 are the same as embodiment 1. S2, print 20pL of destroyer in each pixel pit, so that the weight ratio of water-soluble quantum dots to destroyer is 1:1.

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Abstract

The invention provides a printing method of quantum dot ink. The printing method comprises the following steps: S1, printing quantum dot ink to a target region, wherein quantum dots in the quantum dotink are first quantum dots; S2, heating the target region, or printing a destructor on the target region so as to obtain secondary quantum dots in the target region; and S3, drying the target region,forming a film layer, and completing a printing process, wherein properties of the first quantum dots are opposite to those of the secondary quantum dots, and the first primary quantum dots and the secondary quantum dots are selected from water-soluble quantum dots and oil-soluble quantum dots. The quantum dot ink containing the first quantum dots is used as a raw material for printing, and in the printing process, the first quantum dots are converted into the secondary quantum dots under the influence of heating or a destruction agent. Because of change of solubility of quantum dots, the quantum dots can sink freely, are free from influence of a coffee ring effect, and are capable of forming clear, uniform and stable patterns in the target region.

Description

technical field [0001] The invention relates to the field of quantum dot inks, in particular to a printing method of quantum dot inks. Background technique [0002] In the process of realizing quantum dot printing display, inkjet printing has strict requirements on the stability, viscosity and surface tension of quantum dot ink. Ideally, quantum dot inks should ensure the uniformity of film formation while ensuring printing stability. [0003] In the film-forming process of existing quantum dot inks, due to the existence of the coffee ring effect, the resolution of the pattern formed by inkjet printing will be low, and the performance of the functional device formed by it will also be affected. At the same time, due to the complex solvent system of quantum dot inks and poor stability (long-term storage of quantum dot inks affects the efficiency and life of quantum dots themselves), and the requirements for inkjet printing are cumbersome, which makes inkjet printing have cer...

Claims

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Application Information

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IPC IPC(8): C09D11/38C09D11/50C09D11/36
CPCB41M5/0088C09D11/38C09D11/50C09D11/36
Inventor 郭海涛
Owner NANJING TECH CORP LTD
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