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Quantum dot ink and preparation method thereof

A technology of quantum dots and quantum dot materials, which is applied in the field of quantum dot ink and its preparation, can solve the problems of low efficiency of light-emitting devices, and achieve the effect of improving current efficiency and uniform film formation

Inactive Publication Date: 2019-05-03
GUANGDONG JUHUA PRINTING DISPLAY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Improving the structure of quantum dot electroluminescent devices is also an effective means to improve the luminous efficiency of devices, but there are few reports on the matching quantum dot inks, resulting in generally low efficiency of quantum dot electroluminescent devices

Method used

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  • Quantum dot ink and preparation method thereof
  • Quantum dot ink and preparation method thereof
  • Quantum dot ink and preparation method thereof

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preparation example Construction

[0061] The preparation method of above-mentioned quantum dot ink comprises:

[0062] Weigh each raw material according to the above weight ratio

[0063] The quantum dot material and acceptor material are placed in the beaker;

[0064] Add two-thirds of the required polar solvent and stir evenly to completely dissolve the quantum dot material and acceptor material;

[0065] Add the remaining polar solvent, stir and dilute to obtain quantum dot ink.

[0066] By adjusting the component content of each raw material in the above-mentioned quantum dot ink, the quantum dot ink whose viscosity and surface tension can be applied to the requirements of inkjet printing equipment and printing process conditions is obtained, so as to ensure uniform film formation of inkjet printing.

[0067] The quantum dot ink and its preparation method of the present invention will be further described in detail below in conjunction with specific embodiments.

Embodiment 1

[0069] This embodiment provides a QLED device, which includes a stacked anode, a functional layer containing m-MTDATA as a donor material, a light emitting layer and a cathode.

[0070] Wherein, the luminescent layer is prepared by ink-jet printing of quantum dot ink.

[0071] The above-mentioned quantum dot ink is composed of CdSe / ZnS quantum dots, 1,3,5-tris(m-pyridin-3-ylphenyl)benzene (TmPyPB), chlorobenzene and tetralin. Among them, CdSe / ZnS quantum dots account for 7% of the total weight of the ink, 1,3,5-tris(m-pyridin-3-ylphenyl)benzene accounts for 3% of the total weight of the ink, and chlorobenzene accounts for 56% of the total weight of the ink. %, tetralin accounts for 34% of the total weight of the ink.

[0072] After accurate weighing, place CdSe / ZnS quantum dots and 1,3,5-tris(m-pyridin-3-ylphenyl)benzene in a 250ml flask, add the pre-configured mixture of chlorobenzene and tetralin The mixed polar solvent of composition, the amount that adds is two-thirds of...

Embodiment 2

[0074] This embodiment provides a QLED device, which includes a stacked anode, a functional layer containing m-MTDATA as a donor material, a light emitting layer and a cathode.

[0075] Wherein, the luminescent layer is prepared by ink-jet printing of quantum dot ink.

[0076] The above-mentioned quantum dot ink is composed of CdSe / ZnS quantum dots, TmPyTZ, chlorobenzene and tetralin. Among them, CdSe / ZnS quantum dots account for 7% of the total ink weight, TmPyTZ accounts for 3% of the total ink weight, chlorobenzene accounts for 56% of the total ink weight, and tetralin accounts for 34% of the total ink weight.

[0077] After accurate weighing, put CdSe / ZnS quantum dots and TmPyTZ in a 250ml flask, add a pre-configured mixed polar solvent composed of chlorobenzene and tetralin, the amount added is 1 / 3 of the required volume 2. Stir to dissolve the material completely. After that, add the remaining solvent, stir and dilute, and the product is obtained.

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Abstract

The invention relates to quantum dot ink which comprises the following raw materials in percentage by weight: 65%-94% of a polar solvent, 5%-15% of a quantum dot material and 1%-20% of a receptor material; the acceptor material is used for forming a shock-based compound. After the quantum dot ink is adopted to prepare a light-emitting layer, the acceptor material in the light-emitting layer can bein contact with a donor material of adjacent other functional layers so as to form an intermolecular electron donor, namely the shock-based compound, triplet state excitons can be effectively converted into singlet excitons, the singlet excitons are transferred to quantum dots through forester fluorescent resonance energy transfer, the quantum dots are excited to emit light, and the current efficiency of a device is improved.

Description

technical field [0001] The invention relates to the field of quantum dots, in particular to quantum dot ink and a preparation method thereof. Background technique [0002] Quantum Dot Light Emitting Diode (QLED) devices fabricated by utilizing the electroluminescent properties of quantum dots, as a new light-emitting device, have received extensive attention in recent years. Compared with traditional organic light-emitting diodes (OLEDs), QLEDs have more excellent color purity, brightness and viewing angles. [0003] Quantum dot inks usually consist of quantum dots and a solvent. At present, the improvement of quantum dot ink is mainly aimed at quantum dots and their solvents. Through the improvement of quantum dots and their solvents, the quantum dots themselves have higher luminous efficiency, and the ink made is more stable and more suitable for Print. However, when the quantum dot ink has sufficient printability and good stability, the potential gain effect obtained b...

Claims

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Application Information

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IPC IPC(8): C09D11/50C09D11/30C09D11/36H01L51/50
Inventor 魏雄伟
Owner GUANGDONG JUHUA PRINTING DISPLAY TECH CO LTD
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