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 film, poor solubility, low pixel resolution, etc., and achieve the effect of improving pixel resolution, ensuring stability, and ensuring solubility.
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Embodiment 1
[0058] A method for measuring the coverage of ligands on the surface of quantum dots, comprising:
[0059](1) Determine the average particle size d, and provide several sample particles, which include CdTe quantum dots and 1,2-ethanedithiol ligands bound on the surface of the CdTe quantum dots. Dissolve the sample particles in the heptane solution to prepare a 5 mg / mL solution. After the solution is completely dissolved, take a small amount of the sample particle solution and drop 5 drops on the copper grid, and place the copper grid 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 20%. For magnification analysis of the sample particles, first set the magnification to 70,000 times, take the area where the sample particles are concentrated and uniformly dispersed for focusing analysis, and take its TEM pictures. To analyze the TEM i...
Embodiment 2
[0067] A method for measuring the ligand coverage of quantum dots, comprising:
[0068] (1) Determine the average particle size d, and provide several sample particles, which include ZnO quantum dots and n-propylamine bound to the surface of the ZnO quantum dots. Dissolve the sample particles in the heptane solution to prepare a 5 mg / mL solution. After the solution is completely dissolved, take a small amount of the sample particle solution and drop 5 drops on the copper grid, and place the copper grid in a transmission electron microscope analyzer for testing and analysis . Set the accelerating voltage to 300 kV, the emission current to 15 μA, the working distance to 18 mm, and the dead time to 25%. For magnification analysis of the sample, first set the magnification to 110,000 times, take the area where the sample particles are concentrated and uniformly dispersed for focusing analysis, and take its TEM picture. To analyze the TEM images, first set the scale length, and t...
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