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 thin film, low pixel resolution, non-uniform photoelectric efficiency, etc.

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

AI Technical Summary

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] To determine the coverage of phosphorus-containing ligands on the surface of CdZnSeS quantum dots:

[0042] Determine the average particle size d of CdZnSeS quantum dots. Take the surface ligand of cetyl phosphoric acid and trioctylphosphine CdZnSeS quantum dots dissolved in n-hexane solution, the prepared 1 mg / ml solution, after the solution is completely dissolved, take a small amount of quantum dot solution drops 10 drops on the copper mesh, the carbon mesh is placed in a transmission electron microscope analyzer for test analysis. The setting acceleration voltage is 300kV, the transmit current is 20μA, the working distance is set to 20 mm, and the dead time is 40%. For the amplification analysis of the sample, the magnification is set to 100,000 times, and the concentrated and uniformly dispersed area of the quantum dots is taken for focus analysis, and the TEM picture is taken. The TEM picture was analyzed, the ruler length was set first, and then 30-80 quantum dots ...

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PUM

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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 present invention relates to the field of quantum dot technology, in particular to a method for determining the coverage of ligands on the surface of a quantum dot. Background [0002] Quantum dots refer to semiconductor nanocrystals whose geometric size is smaller than the radius of their exciton Bohr. Due to their excellent optical properties such as absorption bandwidth, narrow fluorescence emission band, high quantum efficiency, and good light stability, quantum dots have great potential applications in biomedicine, environmental energy, lighting display and other fields. Quantum dot-based luminescence display technology has been highly valued by the display industry in recent years, compared with liquid crystal display and organic luminescence display, quantum dot luminous color gamut is wider, color purity is higher, the structure is simpler, the stability is higher, is considered to be a new generation of display technology. [0003] The preparat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/73
CPCY02E10/549
Inventor 覃辉军叶炜浩杨一行
Owner TCL CORPORATION
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