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Determination method of ligand content on particle surface and preparation method of quantum dot ink

A particle surface and measurement method technology, applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of difficult dissolution of quantum dots, uneven photoelectric efficiency, and affecting the quality of the light-emitting layer film

Active Publication Date: 2021-10-22
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

[0054] (1) Determine the surface thiol ligand content ω of the quantum dots in the reference sample particles 1 . Wherein the quantum dots are CdSe quantum dots, and the surface ligand is octyl thiol, comprising the following steps:

[0055] ① Preparation of absorption liquid, weigh a certain amount of formaldehyde and dissolve it in water, mix to obtain 100ml of formaldehyde solution with a mass fraction of 10%, and then add 1.58g of potassium hydrogen phthalate and 0.3g of ethylenediaminetetraacetic acid into the absorption liquid Disodium, adjust the pH value of the absorption solution to be neutral;

[0056] ②Preparation of standard solution, take 0.2 g of sodium sulfite and dissolve it in freshly boiled and cooled water, then use the absorption solution described in step ① to dilute the sodium sulfite solution into standard solutions of different concentrations;

[0057]③For the drawing of the standard curve, add 0.4 g sodium hydroxide to the standard solution of differ...

Embodiment 2

[0063] (1) Determine the surface thiol ligand content ω of the quantum dots in the reference particle 1 . Wherein the quantum dots are CdZnSe / ZnSe quantum dots, and the surface ligand is 3-mercaptopropionic acid, including the following steps:

[0064] ①Preparation of the absorption liquid, weigh a certain amount of tetrachloromercuric potassium absorbent and dissolve it in water, mix to obtain a 0.04 mol / L tetrachloromercuric potassium absorption liquid, and then add 2.55g of potassium hydrogen phthalate and 0.36 g disodium ethylenediaminetetraacetate, adjust the pH value of the absorption solution to be neutral;

[0065] ②Preparation of standard solution, take 0.2 g of sodium sulfite and dissolve it in freshly boiled and cooled water, then use the absorption solution described in step ① to dilute the sodium sulfite solution into standard solutions of different concentrations;

[0066] ③The drawing of standard curve, add 0.6g sodium hydroxide to the standard solution of dif...

Embodiment 3

[0072] (1) Determine the surface thiol ligand content ω of the quantum dots in the reference particle 1 . Wherein the quantum dots are CdZnSe / CdZnSe / ZnSe quantum dots, and the surface ligand is 1,6-hexanedithiol, including the following steps:

[0073] ①The preparation of the absorption liquid, weigh a certain amount of triethanolamine and dissolve it in water, mix to obtain a 0.09mol / L triethanolamine absorption liquid, and then add 2.95 g of potassium hydrogen phthalate and 0.38 g of ethylenediaminetetrafluoroethylene to the absorption liquid Disodium acetate, adjust the pH of the absorption solution to be neutral;

[0074] ②Preparation of standard solution, weigh 0.2 g of sodium sulfite and dissolve it in freshly boiled and cooled water, then use the absorption solution described in step 1) to dilute the sodium sulfite solution into standard solutions of different concentrations;

[0075] ③To draw the standard curve, add 0.8 g of potassium hydroxide to the standard soluti...

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PUM

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Abstract

The invention provides a method for measuring the content of ligands on the particle surface and a method for preparing quantum dot ink. Using this method to configure the quantum dot ink can ensure the uniformity of the quality of the quantum dot ink, and can ensure that the solubility, drying rate and coffee ring effect of different batches of quantum dot ink are the same, and can improve the pixel resolution of the quantum dot display panel. , Uniformity of lighting voltage and photoelectric efficiency.

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 particle surfaces 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. The display technology based on quantum dot luminescence has been highly valued by the display industry in recent years. Compared with liquid crystal display and organic light-emitting display, quantum dot luminescence has a wider color gamut, higher color purity, simpler structure, and higher stability. It is considered It is a new generation display ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31
Inventor 覃辉军叶炜浩杨一行
Owner TCL CORPORATION
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