Method for measuring coverage rate of quantum dot surface ligand
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, uneven quality of the panel, poor uniformity of the quantum dot solution, etc.
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Embodiment 1
[0037] Determining the Coverage of Phosphorus-Containing Ligands on the Surface of CdZnSe / CdZnSe / ZnSe Quantum Dots
[0038] 1. Determine the average particle size d of CdZnSe / CdZnSe / ZnSe quantum dots. The CdZnSe / CdZnSe / ZnSe quantum dots whose surface ligand is tetradecylphosphoric acid are dissolved in n-hexane solution, and the prepared 5 mg / ml solution is ready to be After the solution is completely dissolved, take a small amount of quantum dot solution and drop 5 drops on the copper grid, and place the carbon grid in a transmission electron microscope analyzer for testing and analysis. Set the accelerating voltage to 200kV, the emission current to 10μA, the working distance to 15 mm, and the dead time to 20%. For magnification analysis of the sample, first set the magnification to 70,000 times, take the area where the quantum dots are concentrated and uniformly dispersed for focusing analysis, and take its TEM picture. To analyze the TEM image, first set the scale length, ...
Embodiment 2
[0046] Determining the Coverage of Phosphorus-Containing Ligands on the Surface of CdZnS / ZnS Quantum Dots
[0047] 1. To determine the average particle size d of CdZnS / ZnS quantum dots, take the CdZnS / ZnS quantum dots whose surface ligands are hexadecyl phosphoric acid and trioctylphosphine and dissolve them 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 grid, and place the carbon grid 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 150,000 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...
Embodiment 3
[0055] Determining the Coverage of Phosphorus-Containing Ligands on the Surface of CdZnS / ZnSe Quantum Dots
[0056] 1. Determine the average particle size d of CdZnS / ZnSe quantum dots. Take the CdZnS / ZnSe quantum dot whose surface ligand is octadecylphosphoric acid and dissolve it 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 the copper grid. The carbon mesh 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 ...
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