Direct synthesis method for preparing size-tunable lead chalcogenide quantum dots and its application
A synthesis method and quantum dot technology, applied in chemical instruments and methods, lead sulfide, semiconductor/solid-state device manufacturing, etc., can solve problems that hinder the progress of quantum dot devices
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Embodiment 1
[0030] Preparation of PbS quantum dot ink
[0031] 1) Preparation of precursor solution: 2.766 g (6 mmol) of lead iodide, 228 mg (1 mmol) of N,N-diphenylthiourea, 4.5 mL of N,N-dimethylformamide and 4.5 mL of Add methyl sulfoxide into a 20mL single-necked flask, stir at room temperature until the precursor is completely dissolved, and obtain a precursor solution for use; wherein the volume ratio of N,N-dimethylformamide and dimethyl sulfoxide is 1 :1;
[0032] 2) Inject 1mL of butylamine into the one-necked flask, and continue stirring for 10 minutes. Transfer the reaction solution to a centrifuge tube, add toluene until the reaction solution becomes turbid, centrifuge at a speed of 8000 rpm, and discard the supernatant after centrifugation for 5 minutes; drain the obtained product under vacuum to synthesize PbS quantum dots Ink was stored in the glove box.
[0033] According to the technical solution of this embodiment, the mixed solvent of N,N-dimethylformamide and dimeth...
Embodiment 2
[0037] Preparation of PbS quantum dot ink
[0038]1) Preparation of precursor solution: 0.2766 g (0.6 mmol) of lead iodide, 22.8 mg (0.1 mmol) of N,N-diphenylthiourea, 4.5 mL of N,N-dimethylformamide and 4.5 mL of γ- Butyrolactone was added to a 20 mL single-necked flask, and stirred at room temperature until the precursor was completely dissolved to obtain a precursor solution for use; wherein the volume ratio of N,N-dimethylformamide and γ-butyrolactone was 1 :1;
[0039] 2) Inject 1mL of butylamine into the one-necked flask, and continue stirring for 10 minutes. Transfer the reaction solution to a centrifuge tube, add toluene until the reaction solution becomes turbid, centrifuge at a speed of 8000 rpm, and discard the supernatant after centrifugation for 5 minutes; drain the obtained product under vacuum to synthesize PbS quantum dots Ink was stored in the glove box.
[0040] According to the technical solution of this embodiment, the mixed solvent of N,N-dimethylformam...
Embodiment 3
[0044] Preparation of PbS quantum dot ink
[0045] 1) Preparation of precursor solution: 55 g (0.12 mmol) of lead iodide, 4.56 mg (0.02 mmol) of N,N-diphenylthiourea and 9 mL of N,N-dimethylformamide were added to a 20 mL single port Stir in the flask at room temperature until the precursor is completely dissolved to obtain a precursor solution for use; the molar ratio of lead iodide to N,N-diphenylthiourea is 6:1, and the amount of the substance is 0.012M;
[0046] 2) Inject 1mL of butylamine into the one-necked flask, and continue stirring for 10 minutes. Transfer the reaction solution to a centrifuge tube, add toluene until the reaction solution becomes turbid, centrifuge at a speed of 8000 rpm, and discard the supernatant after centrifugation for 5 minutes; drain the obtained product under vacuum to prepare the obtained PbS quantum Store some ink in the glove box.
[0047] According to the technical scheme of this embodiment, the molar ratio of lead iodide to N,N-dipheny...
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