Quantum dot and preparation method and application thereof
A technology of quantum dots and cores, applied in the field of quantum dots and their preparation, can solve problems such as low external quantum efficiency and failure to meet commercial requirements, achieve low injection barriers, meet commercial requirements, and facilitate electron injection Effect
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[0053] The present invention also provides a method for preparing the above quantum dots, comprising the steps of:
[0054] S1, prepare the kernel;
[0055] S2, mixing the inner core with the first zinc precursor, aliphatic amine, and a solvent to form a first precursor solution, and then adding the first cadmium precursor and the first sulfur precursor to the first precursor solution at a uniform rate, respectively or together, to form the first precursor solution. Second precursor solution, the molar ratio of Cd element to S element in the second precursor solution is 0.15:1 to 0.4:1;
[0056] S3, reacting the second precursor solution at the first temperature to coat the surface of the inner core to form a shell layer to obtain quantum dots.
[0057] In step S1, the preparation process of the inner core includes: mixing a second zinc precursor, a first selenium precursor, a second cadmium precursor, and a solvent, and reacting at a second temperature to obtain a solution c...
Embodiment 1
[0100] Take 2 mmol of basic zinc carbonate, 1.4 mL of oleic acid, and 12 g of octadecene, and under the protection of nitrogen atmosphere, the temperature is raised to 280° C. to form a clear and transparent solution. Then inject 1.0 mL 0.5 mmol / mL Se-ODE suspension and 0.2 mL 0.2 mmol / mL cadmium oleate ODE precursor in turn, heat up to 300°C, add 0.5 mL 2 mmol / mL Se-TBP solution, and continue to heat up Reaction at 310°C for 20min. After purification, 4.0 nm CdZnSe quantum dots were obtained, which were dissolved in 10 mL of octadecene for use.
[0101] Mix 5.0 mL of the above CdZnSe quantum dot solution, 10 mmol of zinc acetate, 25 mmol of oleic acid and 10 g of ODE, and under nitrogen protection, the temperature was raised to 150° C. for reaction for 30 min. Then add 1mL oleylamine, heat up to 300 ℃, start to add Cd-ODE-S-TBP mixed solution dropwise (9mL 0.1mmol / mL cadmium oleate ODE solution mixed with 3mL 2mmol / mL S-TBP, Cd element and S element The molar ratio is 0.15:...
Embodiment 2
[0103] Take 2 mmol of basic zinc carbonate, 1.4 mL of oleic acid, and 12 g of octadecene, and under the protection of nitrogen atmosphere, the temperature is raised to 280° C. to form a clear and transparent solution. Then inject 1.0mL 0.5mmol / mL Se-ODE suspension and 0.4mL 0.2mmol / mL cadmium oleate ODE precursor in turn, heat up to 300°C, add 0.5mL 2mmol / mL Se-TBP solution, continue to heat up Reaction at 310°C for 60min. The CdZnSe quantum dots of 5.5 nm were obtained by purification, which were dissolved in 10 mL of octadecene for use.
[0104] Mix 5.0 mL of the above CdZnSe quantum dot solution, 10 mmol of zinc acetate, 25 mmol of oleic acid and 10 g of ODE, and under nitrogen protection, the temperature was raised to 150° C. for reaction for 30 min. Then add 1 g of octadecylamine, heat up to 300 ° C, start to add Cd-ODE-S-TBP mixed solution (8 mL 0.1 mmol / mL cadmium oleate ODE solution and 2 mL 2 mmol / mL S-TBP mixed, Cd element and S The molar ratio of the elements was ...
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