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Method for measuring content of quantum dot surface ligand and quantum dot ink preparing method

A technology of surface ligands and measurement methods, which is applied in the preparation of test samples and weighing by removing certain components, can solve the problems of low pixel resolution, uneven panel quality, and difficulty in dissolving quantum dots, and achieves The method is simple, the application is wide, and the operability is strong

Inactive Publication Date: 2019-06-25
TCL CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If there are too few ligands on the surface of the quantum dots, the quantum dots are not easy to dissolve in the ink solvent, so inkjet printing cannot be performed
If the surface ligand exchange rate of different batches of quantum dots is different, the solubility, drying rate and coffee ring effect of the quantum dot ink will also be different, which will affect the quality of the light-emitting layer film, which directly leads to the printing of the panel. Uneven quality, low pixel resolution, turn-on voltage, uneven photoelectric efficiency, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 1. Determine the surface thiol ligand content ω of the quantum dots in the reference sample particles 1 . Wherein the quantum dots are CdZnSe / CdZnSe / ZnSe quantum dots, and the surface ligand is octyl thiol, including the following steps:

[0041] Weigh 5 mg of reference sample alumina and sample particles respectively, place them in a quartz crucible, and place them on the left and right sides of the thermocouple of the thermogravimetric analyzer furnace. In the Ar gas environment, the detection pressure was adjusted to 5 MPa, and the gas flow rate was controlled at about 30 mm. Set the heating temperature range to 50-800°C, the heating rate to 2°C / min, and the data collection interval to 1pt / s. The standard sample particles and the reference sample are heated under atmospheric conditions, and the curve of the quantum dot mass change with temperature is tested to obtain a thermogravimetric analysis spectrum. It can be seen from the results that the weight loss ratio ...

Embodiment 2

[0044] 1. Determine the surface phosphate ligand content ω of the quantum dots in the reference sample particles 1 . Wherein the quantum dots are CdZnSe / ZnS quantum dots, and the surface ligand is octadecyl phosphoric acid, including the following steps:

[0045] Weigh 5 mg of reference sample alumina and sample particles respectively, place them in a quartz crucible, and place them on the left and right sides of the thermocouple of the thermogravimetric analyzer furnace. The pressure was adjusted to 8MPa under the Ar gas environment, and the gas flow rate was controlled at about 35 mm. Set the heating temperature range to 50-800°C, the heating rate to 5°C / min, and the data collection interval to 1pt / s. The sample and the standard sample are heated under atmospheric conditions, and the curve of the quantum dot mass change with temperature is tested to obtain a thermogravimetric analysis spectrum. It can be seen from the results that the sample loses weight at ~200°C, and th...

Embodiment 3

[0050] 1. Determine the surface fatty acid ligand content ω of the quantum dots in the reference sample particles 1 . Wherein the quantum dots are CdS / CdZnS / CdZnS / ZnS quantum dots, and the surface ligand is octadecenoic acid, including the following steps:

[0051] Weigh 10 mg of reference sample alumina and sample particles respectively, place them in a corundum crucible, and place them on the left and right sides of the thermocouple of the thermogravimetric analyzer furnace. The pressure was adjusted to 10MPa under the Ar gas environment, and the gas flow rate was controlled at about 30 mm. Set the heating temperature range to 50-800°C, the heating rate to 10°C / min, and the data collection interval to 1pt / s. The sample and the standard sample are heated under atmospheric conditions, and the curve of the quantum dot mass change with temperature is tested to obtain a thermogravimetric analysis spectrum. It can be seen from the results that the sample loses weight at ~200°C,...

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Abstract

The invention provides a method for measuring the content of quantum dot surface ligand and a quantum dot ink preparing method. When the method is used for preparing quantum dot ink, the uniformity ofquantum dot ink quality can be ensured, the consistency of the solubility, drying rates and coffee ring effects of different batches of quantum dot ink is guaranteed, and the pixel resolution and uniformity of the lighting voltages and photoelectric efficiency of the quantum dot display panel are improved.

Description

technical field [0001] The invention relates to the technical field of quantum dot inks, in particular to a method for measuring ligand content on the surface of quantum dots and a preparation method for quantum dot inks. Background technique [0002] Quantum dots refer to semiconductor nanocrystals whose geometric size is smaller than their excitonic Bohr radius. Quantum dots have great potential applications in the fields of biomedicine, environmental energy, and lighting display due to their excellent optical properties such as absorption bandwidth, narrow fluorescence emission band, high quantum efficiency, and good photostability. Compared with liquid crystal display and organic light-emitting display, the display technology based on quantum dot luminescence has been highly valued by the display industry in recent years. Quantum dot luminescence has a wider color gamut, higher color purity, simpler structure, and higher stability. It is a new generation display technol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/04G01N1/38
Inventor 覃辉军叶炜浩杨一行
Owner TCL CORPORATION
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