CuInSe2 ultra-small quantum dot as well as preparation method and application thereof
A technology of quantum dots and ions, which is applied in the field of water-soluble CuInSe2 quantum dots and its aqueous phase synthesis, to achieve the effects of easy control of process parameters, narrow size distribution, and good luminous performance
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[0041] CuInSe 2 The preparation method of ultra-small quantum dots, described method is prepared in aqueous phase, comprises the steps:
[0042] S1: Preparation of thiocyanic acid or thiol-coordinated Cu and In ion precursor solutions and selenium precursor solutions:
[0043] Preparation of Cu and In ion precursor solution: Dissolve copper salt and indium salt in water according to the proportion, add small molecule thiocyanic acid or mercapto encapsulant and stir to obtain white precipitate, add OH - Until the precipitate dissolves and adjust the pH value of the solution to 7-12;
[0044] Wherein, the molar ratio of copper salt and indium salt is 1:1~1:10, and described copper salt is selected from any one in CuI, CuCl, CuBr, Cu(OAc) or CuSCN; Indium salt is selected from In (OAc) 3 , InCl 3 , InBr 3 , InI 3 , In(NO 3 ) 3 or In 2 (SO 4 ) 2 Any one of them; the molar ratio of the small molecule thiocyanate encapsulating agent to the copper salt is 1:6~1:60, and the...
Embodiment 1
[0052] The preparation method of the ultra-small CuInSe2 quantum dot wrapped by thiocyanate is as follows:
[0053] S1: Preparation of 1:1 precursor solution of Cu and In ions coordinated by thiocyanate: 0.004g Cu(Ac) 2 and 0.006g In(Ac) 3 Dissolve in 10mL H 2 O, 0.0462g of trimeric thiocyanic acid was added thereto, and stirred to obtain a white precipitate. NaOH was added to the precipitate to adjust the pH of the solution to 7-10. It is 2mmol / L that obtains copper ion concentration, and the metal complex precursor solution that indium ion concentration is 2mmol / L.
[0054] S2: One-pot method to prepare ultra-small CuInSe coated with thiocyanuric acid 2 Quantum dot aqueous solution: Weigh 0.016g of selenium powder, dissolve it in 1mL of hydrazine hydrate, and prepare Se 2- Selenium precursor solutions such as hydrogen selenide with a concentration of 1mol / L,
[0055] S3: Mix the solution with the above-mentioned metal complex precursor solution under stirring and put i...
Embodiment 2
[0059] Ultra-small CuInSe coated with thiocyanate 2 The preparation method of quantum dots is as follows:
[0060] S1: Preparation of 1:10 precursor solution of Cu and In ions coordinated by thiocyanate: 0.004 g Cu(Ac) 2 and 0.06g In(Ac) 3 Dissolve in 10mL H 2 O, 0.0462g of trimeric thiocyanic acid was added thereto, and stirred to obtain a white precipitate. NaOH was added to the precipitate to adjust the pH of the solution to 7-10. It is 2mmol / L that obtains copper ion concentration, and the metal complex precursor solution that indium ion concentration is 20mmol / L.
[0061] S2: One-pot method to prepare ultra-small CuInSe coated with thiocyanuric acid 2 Quantum dot aqueous solution: weigh 0.016g selenium powder, dissolve in 1mL hydrazine hydrate,
[0062] S3: Mix the solution with the above-mentioned metal complex precursor solution under stirring and put it into a hydrothermal kettle to grow at 90-170°C for 1-60 hours to obtain ultra-small CuInSe coated with thiocyan...
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