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Method for measuring coverage rate of quantum dot surface ligand

A surface ligand and measurement method technology, applied in the field of quantum dots, can solve problems such as poor solubility, poor uniformity of quantum dot solution, and uneven photoelectric efficiency

Active Publication Date: 2019-06-25
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
Comparison scheme
Effect test

Embodiment 1

[0041] Determining the coverage of phosphorus-containing ligands on the surface of CdZnSeS QDs:

[0042] Determine the average particle size d of the CdZnSeS quantum dots. Dissolve CdZnSeS quantum dots whose surface ligands are octadecylphosphoric acid and trioctylphosphine in n-hexane solution to prepare a 1 mg / ml solution. After the solution is completely dissolved, take a small amount of quantum dot solution and drop 10 drops on On the copper grid, the carbon grid was placed in a transmission electron microscope analyzer for testing and analysis. Set the accelerating voltage to 300kV, the emission current to 20μA, the working distance to 20 mm, and the dead time to 40%. For magnification analysis of the sample, first set the magnification to 100,000 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 image, first set the scale length, and then take 30-80 quantum dots for cali...

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PUM

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Abstract

The invention provides a method for measuring the coverage rate of a quantum dot surface ligand, thereby realizing quality evaluation of quantum dots. If Ki is less than 2*10<-10> mol / cm<2>, the quality of the quantum dot is poor; and solution or ink configuration can not be carried out until the Ki value is improved. With the provided method, the result is accurate; and the operation is simple. Furthermore, with the method, the high stability of the quantum dot surface ligand content is ensured; the solubility of different batches of quantum dots is guaranteed; a coffee ring effect caused bydifferent drying rates in quantum dot solution preparation for a film is avoided; add the pixel resolution and uniformity of the brightening voltage and the photoelectric efficiency of the quantum dotdisplay panel can be improved.

Description

technical field [0001] The invention relates to the technical field of quantum dots, in particular to a method for measuring ligand coverage on the surface of quantum dots. 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 generation display technology. [0003] The preparation t...

Claims

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Application Information

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IPC IPC(8): G01N21/73
CPCY02E10/549
Inventor 覃辉军叶炜浩杨一行
Owner TCL CORPORATION
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