Quantum dot purification method
A purification method and technology for quantum dots, applied in the field of quantum dots, can solve the problem of inability to effectively separate quantum dot products from system impurities, and achieve the effects of easy repeatability and simple purification process.
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[0060] Example 1
[0061] In this embodiment, trioctylphosphine (TOP) is used to purify the quantum dot reaction system containing excess zinc oleate cation precursor, including the following steps:
[0062] (1) Provide 20 mL of quantum dot reaction system containing excess zinc oleate cation precursor after the reaction, and control the temperature from 300°C to 150°C;
[0063] (2) Add 2 mL of trioctyl phosphine to the reaction system and keep the temperature at 150°C for 15 minutes;
[0064] (3) Cool the reaction system to room temperature, then add acetone to get the precipitate and centrifuge, pour off the liquid phase, and re-disperse the solid phase obtained by centrifugation in n-hexane, then add acetone to re-precipitate and centrifuge, and repeat 5 times. Obtain high-purity quantum dot samples.
Example Embodiment
[0065] Example 2
[0066] This embodiment uses octadecylphosphonic acid to purify the quantum dot solution containing excess zinc oleate cation precursor, including the following steps:
[0067] (1) Under the protection of an inert atmosphere, take 15 mL of the n-hexane solution of quantum dots containing excess zinc oleate cation precursor and inject it into a three-necked flask containing 15 mL of octadecene;
[0068] (2) Heat the solution system in the three-necked flask to 80°C and maintain it for 30mins to completely remove the n-hexane in the solution system; continue to heat the solution system to 320°C, add 10mL octadecylphosphonic acid to the solution system, and keep it React at 320℃ for 1mins;
[0069] (3) After cooling the reaction system to room temperature, add acetone to get the precipitate and centrifuge to separate, pour off the liquid phase and re-disperse the solid phase obtained by centrifugation in n-hexane, then add acetone to re-precipitate and centrifuge, repea...
Example Embodiment
[0070] Example 3
[0071] This embodiment uses tributyl phosphine to purify the quantum dot reaction system containing excess Se-TOP anion precursor, including the following steps:
[0072] (1) Provide 20 mL of quantum dot reaction system containing excess Se-TOP anion precursor after the reaction, and control the temperature from 300°C to 150°C;
[0073] (2) Add 0.2 mL of tributyl phosphine to the reaction system, stir and react for 12 hours under a nitrogen atmosphere at room temperature;
[0074] (3) After cooling the reaction system to room temperature, perform conventional precipitation and centrifugal separation and purification: add acetone to obtain the precipitate and then centrifuge, pour off the liquid phase and re-disperse the solid phase obtained by centrifugation in n-hexane, and then add acetone to re-precipitate and centrifuge. This reciprocating 5 times can obtain a high-purity quantum dot sample.
[0075] In summary, the present invention provides a method for purifyi...
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