CuInS2/ZnS/ZnS/ZnS multilayer core-shell structure green fluorescent quantum dot and preparation method thereof
A multi-layer core-shell structure, green fluorescence technology, applied in the field of semiconductor nanomaterials preparation, can solve the problem of large particle size of quantum dots, achieve the effect of improving fluorescence quantum yield and reducing surface defects
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Embodiment 1
[0029] a CuInS 2 / ZnS / ZnS / ZnS core-shell structure green fluorescent quantum dots are prepared by the following steps:
[0030] (1) Dissolving 0.8mmol of sulfur powder in 6.0mmol of oleylamine to obtain a sulfur-oleylamine precursor solution; dissolving 0.075mmol of cuprous iodide and 0.3mmol of indium acetate into 16mmol of dodecanethiol and 5mL of octadecan In the mixed solution composed of alkene (solvent), make the concentration of cuprous iodide 0.008mol / L, vacuumize while stirring, pass nitrogen, repeat three times, and finally raise the temperature to 100°C under the protection of nitrogen, and wait for the solution to become clear Afterwards, continue to heat up to 130°C, inject the sulfur-oleylamine precursor solution at this temperature, keep the reaction at this temperature for 5 minutes, cool to terminate the reaction, and obtain CuInS 2 Quantum dot solution. The quantum dot size is 1.8nm.
[0031] (2) The resulting CuInS prepared in step (1) 2 Add 2 mmol of zi...
Embodiment 2
[0034] Same as Example 1, the difference is:
[0035] In step (1), 0.4 mmol of sulfur powder is dissolved in 3 mmol of dodecylamine as a precursor solution. In step (1): 0.0375 mmol of cuprous iodide and 0.15 mmol of indium acetate are dissolved in 7.425 mmol of In a mixed solution composed of dithiol (sulfur source and coordination stabilizer) and 5mL octadecene (solvent), the concentration of cuprous iodide is 0.004mol / L, and after the reaction, CuInS 2 Quantum dot solution.
Embodiment 3
[0037] Same as Example 1, the difference is:
[0038] In step (1), 8 mmol of sulfur powder is dissolved in 6.0 mmol of cetylamine as a precursor solution, in step (1): 0.75 mmol of cuprous iodide and 3 mmol of indium acetate are dissolved in 160 mmol of dodecylsulfur In the mixed solution that alcohol (sulfur source and coordination stabilizer), 5ml octadecene (solvent) form, make cuprous iodide concentration be 0.08mol / L, obtain CuInS after reaction 2 Quantum dot solution.
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