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

A technology of surface ligands and measurement methods, applied in the field of quantum dots, can solve the problems of poor solubility, poor uniformity of quantum dot solution, and non-uniform photoelectric efficiency.

Active Publication Date: 2022-05-24
TCL CORPORATION
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  • Abstract
  • Description
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  • 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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  • A method for measuring the coverage of ligands on the surface of quantum dots

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Embodiment 1

[0044] The coverage of octanethiol ligands on the surface of CdZnSe / CdZnSe / ZnSe quantum dots was determined.

[0045] The average particle size d of the CdZnSe / CdZnSe / ZnSe quantum dots was determined. Dissolve CdZnSe / CdZnSe / ZnSe quantum dots whose surface ligand is octanethiol in n-hexane solution, and prepare a 5 mg / ml solution. After the solution is completely dissolved, take a small amount of quantum dot solution and drop 5 drops on the copper mesh. The copper mesh was placed 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 zoom in and analyze the sample, first set the magnification to 70,000 times, take the area where the quantum dots are concentrated and evenly dispersed for focusing analysis, and take its TEM picture. To analyze the TEM images, first set the length of the scale, and then take 30-80 quantum dots fo...

Embodiment 2

[0051] The coverage of octadecylphosphoric acid on the surface of CdZnSe quantum dots was determined.

[0052] The average particle size d of the CdZnSe quantum dots was determined. Dissolve CdZnSe quantum dots whose surface ligand is octadecylphosphoric acid in n-hexane solution to prepare a 3 mg / ml solution. After the solution is completely dissolved, take a small amount of quantum dot solution and drop 8 drops on the copper mesh. Placed in a transmission electron microscope analyzer for test analysis. Set the accelerating voltage to 300 kV, the emission current to 20 μA, the working distance to be 20 mm, and the dead time to be 40%. To zoom in and analyze the sample, first set the magnification to 150,000 times, take the area where the quantum dots are concentrated and evenly dispersed for focusing analysis, and take its TEM picture. The TEM image was analyzed, the length of the scale was set first, and then 30-80 quantum dots were selected for calibration, and the averag...

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Abstract

The invention provides a method for measuring the ligand coverage on the surface of quantum dots, which can be used for quality assessment 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): G01N23/00
CPCY02E10/549
Inventor 覃辉军叶炜浩杨一行
Owner TCL CORPORATION
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