Green and simple method for preparing Cu-doped selenide multi-element alloy quantum dot

A multi-element alloy, quantum dot technology, applied in the green and convenient field of Cu-doped selenide multi-element quantum dots, to achieve the effect of excellent device performance

Active Publication Date: 2015-09-30
NINGBO UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, ODE has the best dissolution effect, but this meth

Method used

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  • Green and simple method for preparing Cu-doped selenide multi-element alloy quantum dot
  • Green and simple method for preparing Cu-doped selenide multi-element alloy quantum dot
  • Green and simple method for preparing Cu-doped selenide multi-element alloy quantum dot

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0036] Preparation of Se precursor solution

[0037] Weigh 1mmol of the elemental selenium powder (the amount of elemental selenium powder can also be 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 2.9, 3.3, 4.1, 5.3, 6.2, 7.3, 8.7, 9.4, 10.6, 11.5, 1.2 and any other value within the range of 1-12mmol) dissolved in 10ml of a mixed solution of octadecene ODE and organic amine ligand (oleylamine (OLA)) (where the volume ratio of ODE to OLA is 1:1) Form a homogeneous mixed solution.

[0038] The volume ratio of ODE to OLA in the mixed solution of octadecene ODE and organic amine ligand (oleylamine (OLA)) can also be 1:2, 1:3, 1:4, 1:5, 1:1.2, 1 :3.5, 1:2.1.

[0039] Preparation of Zn precursor solution

[0040] Weigh zinc salt (zinc acetate, zinc salt can also be one or a mixture of zinc chloride, zinc stearate, and zinc diethyldithiocarbamate) 1mmol (the amount of zinc salt can also be 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 2.9, 3.3, 4.1, 5.3, 6.2, 7.3, 8.7, 9.4, 10.6, 11.5, 1.2 and any other with...

Example Embodiment

[0043] Example 1

[0044] Weigh CuCl (4mg, 0.04mmol, copper salt can also be one or a mixture of copper chloride, copper acetate, cuprous iodide), In(Ac) 3 (58mg 0.2mmol, indium salt can also be one or a mixture of indium chloride and indium nitrate), Zn(Ac) 2 (36mg 0.2mmol, zinc salt can also be one or a mixture of zinc chloride, zinc nitrate and zinc stearate) DDT (1mL), OLA (1mL) and ODE (5mL) are added to the 100mL three neck In the bottle. The high-purity argon atmosphere in the bottle is ensured by repeated vacuuming and then argon. Increase the temperature from room temperature to 100°C for 20 minutes to remove residual water molecules and low-boiling organics, and obtain a transparent solution. Then the temperature is increased to 220°C and the temperature is kept for 10 minutes. Measure the selenium (Se) precursor solution (containing 63mg (0.8mmol) Se, 1mL ODE and 1mL oleylamine (OLA)) and quickly inject it into a three-necked flask, keep it for 30 minutes at the inje...

Example Embodiment

[0048] Example 2

[0049] Weigh CuCl successively 2 (4mg, 0.04mmol), In(Cl) 3 (58mg 0.2mmol), Zn(Cl) 2 (36mg 0.2mmol) DDT (1mL), OLA (1mL) and ODE (5mL) were added to a 100mL three-necked flask. The high-purity argon atmosphere in the bottle is ensured by repeated vacuuming and then argon. Raise the temperature from room temperature to 80°C for 30 minutes to remove residual water molecules and low-boiling organics to obtain a transparent solution. Then the temperature is increased to 200°C and the temperature is kept for 20 minutes. Measure the selenium (Se) precursor solution (containing 63mg (0.8mmol) Se, 1mL ODE and 1mL oleylamine (OLA)) and quickly inject it into a three-necked flask, keep it for 40min at the injection temperature, and obtain Cu:Zn-In- Se quantum dot nuclei. The crystal nucleus was quickly dropped to 132°C to stop the nucleus from continuing to grow. At this temperature, 1mL zinc precursor solution (containing 0.2mmol zinc acetate (Zn(Ac) 2 And 1mL ODE, 1...

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Abstract

The invention discloses a green and simple method for preparing a Cu-doped selenide multi-element alloy quantum dot. The method comprises the following steps: preparing a Se precursor solution and a Zn precursor solution; and adding a Zn salt, a In salt, a Cu salt and an organic cladding agent into octadecene (ODE), heating to obtain a transparent solution, heating the transparent solution in the presence of a protection gas, mixing the heated transparent solution with the Se precursor solution, and reacting to obtain the Cu:Zn-In-Se bare nucleus quantum dot. The method has the advantages of safe and simple synthesis conditions, and no heavy metal element Cd, organophosphorus or other toxic inflammable reagents; and the luminescence efficiency of the quantum dot is high, the fluorescence peak of the quantum dot is tunable from 560nm to 720nm, and the PL QY can reach 38%.

Description

technical field [0001] The invention relates to the technical field of quantum dots, in particular to a green and convenient method for Cu-doped selenide multi-element quantum dots, which belongs to the technical field of material preparation. [0002] The meaning of PL QY in the present invention is luminescence quantum efficiency. Background technique [0003] Cu-doped quantum dots can not only maintain all the characteristics of the original intrinsic quantum dots, but also add many additional properties to the quantum dots, such as increasing the Stokes shift to reduce self-absorption, improving the thermal stability and The chemical stability and the increase of the carrier coincidence lifetime of quantum dots make this kind of doped quantum dots have great application prospects in the fields of biological imaging and diagnosis, solar cells, and light-emitting lighting display devices. However, with the demands of practical applications, such as in quantum dot LEDs, it...

Claims

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Application Information

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IPC IPC(8): C09K11/88
Inventor 郑金桔曹盛王霖高凤梅尚明辉杨祚宝杨为佑
Owner NINGBO UNIVERSITY OF TECHNOLOGY
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