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

A technology of surface ligands and quantum dots, used in inks, measuring devices, material analysis using wave/particle radiation, etc., can solve problems such as affecting the quality of light-emitting layer films, inability to perform inkjet printing, and insoluble quantum dots

Active Publication Date: 2022-03-01
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

[0041] 1. Determine the content of nitrogen-containing ligands on the surface of quantum dots in the reference sample particles ω 1 . Wherein the quantum dots are CdSe quantum dots, and the surface ligand is octadecylamine, including the following steps:

[0042] Weigh 5 mg of sample particles, grind them finely with an agate mortar, and dilute 2*2cm with acetone or isopropanol 2Wipe clean the aluminum foil, cut ~ 1*1cm 2 Paste the double-sided tape on the center of the aluminum foil, spread the sample particle powder on the double-sided tape, and spread the sample particle powder evenly over the entire tape with a clean stainless steel sampling spoon, take another piece of aluminum foil that is wiped clean with acetone to cover the sample particle The powder is placed between two flat stainless steel modules, the pressure is set to 7MPa under the oil press, and the sample is taken out after pressing for 10s. At this time, the sample to be tested is a sheet with a smooth sur...

Embodiment 2

[0047] 1. Determine the content of nitrogen-containing ligands on the surface of quantum dots in the reference sample particles ω 1 . Wherein the quantum dots are ZnO quantum dots, and the surface ligand is stearic acid, comprising the following steps:

[0048] Weigh 15 mg of sample particles and grind them finely with an agate mortar. Dilute 2*2cm with acetone or isopropanol 2 Wipe clean the aluminum foil, cut ~ 1*1cm 2 The double-sided tape is attached to the center of the aluminum foil. Spread the sample particle powder on the double-sided tape, and spread the powder evenly over the entire tape with a clean stainless steel sampling spoon. Take another piece of aluminum foil wiped with acetone to cover the sample particle powder and place it between two flat stainless steel modules. Set the pressure under the oil press to 15MPa, and take out the sample after pressing for 10s. At this time, the sample to be tested has a flat surface, Thick flakes. Remove the upper layer...

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Abstract

The invention proposes a method for measuring ligand content on the surface of quantum dots 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 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 Patents(China)
IPC IPC(8): G01N23/2273C09D11/03
Inventor 覃辉军叶炜浩杨一行
Owner TCL CORPORATION
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