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

A surface ligand and measurement method technology, applied in the field of quantum dots, can solve the problems of affecting the light-emitting layer film, low pixel resolution, and uneven photoelectric efficiency

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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Experimental program
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Embodiment 1

[0050] A method for determining the coverage of ligands on the surface of quantum dots, comprising:

[0051] (1) Determine the average size d of the particles, and provide several sample particles, the particles include CdSe quantum dots and octanethiol ligands bound on the surface of the CdSe quantum dots. Dissolve the sample particles in n-hexane 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. Place the copper mesh in a transmission electron microscope analyzer for testing and analysis. Set the accelerating voltage to 200 kV, the emission current to 10 μA, the working distance to 15 mm, and the dead time to be 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 analyze the TEM image, ...

Embodiment 2

[0060] A method for determining the ligand coverage of quantum dots, comprising:

[0061] (1) The average size d of the particles is determined, and several sample particles are provided, and the particles include CdSe quantum dots and octanethiol ligands bound on the surface of the CdSe quantum dots. Dissolve the sample particles in the n-octane solution to prepare a 5mg / ml solution. After the solution is completely dissolved, take a small amount of sample particle solution and drop 8 drops on the copper mesh, and place the copper mesh in a transmission electron microscope analyzer for testing and analysis. , set the acceleration voltage to 300kV, the emission current to 20μA, the working distance to 20mm, and the dead time to be 30%, to zoom in and analyze the sample particles, first set the magnification to 100000 times, and take the area where the sample particles are concentrated and evenly dispersed for focusing analysis , take its TEM pictures. To analyze the TEM pictu...

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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 coverage rate K of thiol-containing organic ligands on the surface of quantum dots by redox method 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): G01N21/31
CPCY02E10/549
Inventor 覃辉军叶炜浩杨一行
Owner TCL CORPORATION
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