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

A technology of surface ligands and measurement methods, which is applied in the direction of analysis by nuclear magnetic resonance, etc., can solve the problems of uneven panel quality, 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

[0044] (1) The quantum dot sample is CdZnSe / CdZnSe / ZnSe quantum dot, and the surface ligand is tetradecyl phosphoric acid. The steps for determining the content of P-containing surface ligands in the standard quantum dot sample include: weighing 10 mg of triphenyl phosphate and adding 1.000 mL of deuterated chloroform to form an internal standard solution of 10.0 mg / mL. Weigh the quantum dot sample and add 0.500 mL deuterated chloroform to make a 60.0 mg / mL solution, then add 0.1 mL internal standard solution to obtain the sample solution. The internal standard solution and the sample solution are respectively placed in the nuclear magnetic resonance equipment, the operating frequency of the adjustment nuclear magnetic resonance equipment is 150MHz, and the test temperature is 275K. 31 The spectral width of PNMR is 70 Hz. Obtain the PNMR curve spectrum of the internal standard solution and the PNMR curve spectrum of the 5 sample solutions; carry out the integral operation, di...

Embodiment 2

[0047] (1) The quantum dot sample is CdZnS / ZnS quantum dots, and the surface ligand is hexadecyl phosphoric acid. The steps for determining the content of P-containing surface ligands in the standard quantum dot sample include: weighing 30 mg of tributyl phosphate and adding 1.000 mL of deuterated chloroform to form an internal standard solution of 30.0 mg / mL. Weigh the quantum dot sample and add 0.500 mL deuterated chloroform to make a 45 mg / mL solution, then add 0.200 mL internal standard solution to obtain the sample solution. The internal standard solution and the sample solution were placed in the nuclear magnetic resonance equipment respectively, and the operating frequency of the nuclear magnetic resonance equipment was adjusted to 180 MHz, and the test temperature was 320K. 31 The spectral width of PNMR is 90 Hz. During the test, the internal standard is first used for baseline scanning, and then the sample test is performed. Obtain the PNMR curve spectrum of the int...

Embodiment 3

[0052] (1) The quantum dot sample is CdZnSe quantum dot, and the surface ligand is octadecylphosphoric acid. The steps for determining the content of P-containing surface ligands in the standard quantum dot sample include: weighing 30 mg of monocrotophos and adding 1.000 mL of deuterated chloroform to prepare a 30.0 mg / mL internal standard solution. Weigh the quantum dot sample and add 0.500 mL deuterated chloroform to make a 30 mg / mL solution, and then add 0.05 mL internal standard solution to obtain the sample solution. The internal standard solution and the sample solution were placed in the nuclear magnetic resonance equipment respectively, and the working frequency of the nuclear magnetic resonance equipment was adjusted to 200 MHz, and the test temperature was 300K. 31 The spectral width of PNMR is 100 Hz. Obtain the PNMR curve spectrum of the internal standard solution and the PNMR curve spectrum of 10 sample solutions; carry out the integral operation, discard the max...

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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. 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 generatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N24/08
Inventor 覃辉军叶炜浩杨一行
Owner TCL CORPORATION
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