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Quantum dot ink and electroluminescence device

A quantum dot and ink technology, applied in the field of quantum dot inks and electroluminescent devices, can solve the problems of easy occurrence of coffee rings, uneven film surface, harsh conditions, etc., and achieves suppression of coffee ring phenomenon, uniform film formation, and film surface smooth effect

Active Publication Date: 2019-08-27
SUZHOU XINGSHUO NANOTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the drying of existing quantum dot inks often needs to be carried out in a vacuum environment, the conditions are relatively harsh, and there is an uneven film surface, which is prone to the problem of coffee rings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A quantum dot ink, comprising: 3wt% red light CdSe / ZnS quantum dots, 37wt% cyclohexyl acetate (boiling point is 173.5 ℃, surface tension is 30.6mN / m), 60wt% linalool (boiling point is 198°C, the surface tension is 28.2mN / m). The above-mentioned quantum dot ink can be prepared by simple mechanical stirring and mixing of various components.

[0031] The above-mentioned CdSe / ZnS quantum dot ink is used to prepare the light-emitting layer of the red photoluminescent device. The specific preparation process of the device is as follows:

[0032] Provide ITO glass substrate as anode;

[0033] Deposit PEDOT:PSS material on the ITO anode layer, and form a hole injection layer after drying;

[0034] Then deposit PVK material on the hole injection layer, and form the hole transport layer after drying;

[0035] On the PVK hole transport layer, the CdSe / ZnS quantum dot ink in Example 1 was inkjet printed, the process was smooth, and the ink droplets were naturally dried in the at...

Embodiment 2

[0040]A quantum dot ink, comprising: 3wt% red light CdZnSeS / ZnS quantum dots, 57wt% cyclohexyl methacrylate (boiling point is 210 ℃, surface tension is 30.5mN / m), 21wt% citronellol ( The boiling point is 224.5° C., the surface tension is 28.5 mN / m), and 19 wt % cyclohexanone (the boiling point is 155° C., the surface tension is 34.5 mN / m). The above-mentioned quantum dot ink can be prepared by simple mechanical stirring and mixing of various components.

[0041] The above-mentioned CdZnSeS / ZnS quantum dot ink is used to prepare the light-emitting layer of the red photoluminescent device. The specific preparation process of the device is as follows:

[0042] Provide ITO glass substrate as anode;

[0043] Deposit PEDOT:PSS material on the ITO anode layer, and form a hole injection layer after drying;

[0044] Then deposit PVK material on the hole injection layer, and form the hole transport layer after drying;

[0045] On the PVK hole transport layer, the CdZnSeS / ZnS quantum ...

Embodiment 3

[0050] A quantum dot ink, comprising: 2wt% green light CdSeS / ZnS quantum dots, 63wt% isobornyl acetate (boiling point is 220 ℃, surface tension is 33.3mN / m), 20wt% citronellol (boiling point is 224.5°C, surface tension 28.5mN / m), 15wt% cyclohexanone (boiling point 155°C, surface tension 34.5mN / m). The above-mentioned quantum dot ink can be prepared by simple mechanical stirring and mixing of various components.

[0051] The above-mentioned CdSeS / ZnS quantum dot ink is used to prepare the light-emitting layer of the green photoluminescent device. The specific preparation process of the device is as follows:

[0052] Provide ITO glass substrate as anode;

[0053] Deposit PEDOT:PSS material on the ITO anode layer, and form a hole injection layer after drying;

[0054] Then deposit PVK material on the hole injection layer, and form the hole transport layer after drying;

[0055] On the PVK hole transport layer, the CdSeS / ZnS quantum dot ink in Example 3 was inkjet printed, the ...

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Abstract

The invention discloses a quantum dot ink and an electroluminescence device. The quantum dot ink comprises quantum dots and a mixed solvent, the mixed solvent comprises a first solvent and a second solvent, the surface tension of the mixed solvent is 25-35 mN / m, and the difference value of the surface tension of the first solvent and the second solvent is within 0.5-3 mN / m. By selecting solvents different in surface tension, ink droplets can be quickly and naturally dried into a film in an atmospheric environment, film formation is even, the film face is flat, and the phenomenon of a coffee ring is effectively inhibited.

Description

technical field [0001] The application belongs to the technical field of quantum dot luminescence, and in particular relates to a quantum dot ink and an electroluminescence device. Background technique [0002] Quantum dot materials have broad application prospects in the fields of display and lighting due to their excellent properties such as wide excitation spectrum, narrow emission spectrum, adjustable emission color with size, high color purity, and high light conversion efficiency. By applying a certain electric field or light excitation, the quantum dot material will emit light of a specific frequency, so it has been widely used in optoelectronic devices such as quantum dot light-emitting diodes. [0003] For quantum dot light-emitting diodes, quantum dot materials are generally dispersed in ink, and a quantum dot film is prepared by deposition. However, the drying of existing quantum dot inks often needs to be carried out in a vacuum environment, the conditions are r...

Claims

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Application Information

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IPC IPC(8): C09D11/30H01L51/50
CPCC09D11/30H10K50/115
Inventor 王思元温明月王允军
Owner SUZHOU XINGSHUO NANOTECH CO LTD
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