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A method for measuring the coverage of ligands on the surface of quantum dots

A technology of surface ligand and measurement method, applied in the field of quantum dots, can solve the problems of affecting the light-emitting layer film, poor solubility, low pixel resolution, etc., and achieve the effect of improving pixel resolution, ensuring solubility, and ensuring stability.

Active Publication Date: 2022-05-24
TCL CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the surface coverage of the quantum dots is low, the solubility of the quantum dots is poor, the uniformity of the quantum dot solution is poor, and the drying rate of the quantum dot solution and the coffee ring effect affect the quality of the light-emitting layer film, which directly leads to the quality of the printed panel. Problems such as unevenness, low pixel resolution, turn-on voltage, uneven photoelectric efficiency, etc.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0058] A method for determining the coverage of ligands on the surface of quantum dots, comprising:

[0059](1) Determine the average size d of the particles, and provide several sample particles, the particles include CdTe quantum dots and 1,2-ethanedithiol ligands bound on the surface of the CdTe quantum dots. Dissolve the sample particles in the heptane solution to prepare a 5 mg / mL solution. After the solution is completely dissolved, a small amount of sample particle solution is taken and 5 drops are placed on the copper mesh, and the copper mesh is placed in a transmission electron microscope analyzer for testing and analysis. Set the accelerating voltage at 200 kV, the emission current at 10 μA, the working distance at 15 mm, and the dead time at 20%. To magnify and analyze the sample particles, first set the magnification to 70,000 times, take the area where the sample particles are concentrated and evenly dispersed for focusing analysis, and take TEM pictures. To ana...

Embodiment 2

[0067] A method for determining the ligand coverage of quantum dots, comprising:

[0068] (1) Determine the average size d of the particles, and provide several sample particles, the particles include ZnO quantum dots and n-propylamine bound on the surface of the ZnO quantum dots. Dissolve the sample particles in the heptane solution to prepare a solution of 5 mg / mL. After the solution is completely dissolved, take a small amount of sample particle solution and drop 5 drops on the copper mesh, and place the copper mesh in a transmission electron microscope analyzer for testing and analysis. . Set the accelerating voltage at 300 kV, the emission current at 15 μA, the working distance at 18 mm, and the dead time at 25%. To magnify and analyze the sample, first set the magnification to 110,000 times, take the area where the sample particles are concentrated and evenly dispersed for focusing analysis, and take its TEM picture. To analyze the TEM images, first set the length of t...

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Abstract

The invention proposes a method for measuring the coverage ratio of ligands on the surface of quantum dots. Determination of the coverage rate K of ligands of organic ligands containing sulfhydryl groups or nitrogen on the surface of quantum dots by potentiometric titration i , which can be used to evaluate the quality of quantum dots. If K i less than 2*10 ‑10 mol / cm 2 , the quality of quantum dots is not good, and K i Increase the value before proceeding with applications such as solution or ink dispensing. Adopt this method to determine quantum dot surface ligand coverage rate, result is accurate, easy to operate, further, can guarantee the stability of quantum dot surface ligand content by the method of the present invention, can guarantee the solubility of different batches of quantum dots, avoid The coffee ring effect caused by the different drying rates when the quantum dot solution is prepared into a film can improve the uniformity of the pixel resolution, turn-on voltage, and photoelectric efficiency of the quantum dot display panel.

Description

technical field [0001] The invention relates to the technical field of quantum dots, in particular to a method for measuring the coverage of ligands on the surface of quantum dots. Background technique [0002] Quantum dots refer to semiconductor nanocrystals whose geometric dimensions are smaller than their exciton Bohr radius. Due to their excellent optical properties such as absorption bandwidth, narrow fluorescence emission band, high quantum efficiency, and good photostability, quantum dots have great potential applications in the fields of biomedicine, environmental energy, and lighting display. Compared with liquid crystal displays and organic light-emitting displays, quantum dots have a wider color gamut, higher color purity, simpler structure, and higher stability. It is a new generation of display technology. [0003] Preparation techniques of quantum dot display devices include spin coating, inkjet printing, and the like. The specific process of these two metho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N31/16
CPCY02E10/549
Inventor 叶炜浩覃辉军杨一行
Owner TCL CORPORATION
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