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A green and convenient method for preparing Cu-doped selenide multi-element alloy quantum dots

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

Active Publication Date: 2017-05-17
NINGBO UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, ODE has the best dissolution effect, but this method requires a long time at a higher temperature to dissolve Se

Method used

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  • A green and convenient method for preparing Cu-doped selenide multi-element alloy quantum dots
  • A green and convenient method for preparing Cu-doped selenide multi-element alloy quantum dots
  • A green and convenient method for preparing Cu-doped selenide multi-element alloy quantum dots

Examples

Experimental program
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Effect test

preparation example Construction

[0036] Preparation of Se precursor solution

[0037] Take by weighing selenium powder simple substance 1mmol (selenium powder simple substance consumption 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 other arbitrary values ​​within the range of 1-12mmol) were dissolved in the mixed solution of 10ml of octadecene ODE and organic amine ligand (oleylamine (OLA)) (wherein the volume ratio of ODE and OLA is 1:1) to form a homogeneous mixed solution.

[0038] The volume ratio of ODE to OLA in the mixed solution of octadecenyl 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] Take by weighing zinc salt (zinc acetate, zinc salt can also be one or more mixtures in zinc chloride, zinc stearate, diethyldithiocarbamate zinc) 1mmol (zinc salt consumption 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,...

Embodiment 1

[0044] Weigh CuCl (4mg, 0.04mmol, copper salt can also be one or more mixtures of copper chloride, copper acetate, cuprous iodide), In(Ac) 3 (58mg 0.2mmol, the indium salt can also be one or a mixture of indium chloride and indium nitrate), Zn(Ac) 2 (36mg 0.2mmol, the zinc salt can also be one or a mixture of zinc chloride, zinc nitrate, zinc stearate) DDT (1mL), OLA (1mL) and ODE (5mL) were added to a 100mL three-neck in the bottle. The high-purity argon atmosphere in the bottle is ensured by repeated vacuuming and recirculation of argon. Raise the temperature from room temperature to 100°C for 20 minutes to remove residual water molecules and low-boiling organic matter, and obtain a transparent solution. Then the temperature was raised to 220°C and kept for 10 minutes. The selenium (Se) precursor solution (including 63mg (0.8mmol) Se, 1mL ODE and 1mL oleylamine (OLA)) was quickly injected into the three-necked bottle, and kept growing at the injection temperature for 30mi...

Embodiment 2

[0049] Weigh CuCl in turn 2 (4mg, 0.04mmol), In(Cl) 3 (58mg 0.2mmol), Zn(Cl) 2 (36mg0.2mmol) 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 recirculation of argon. Raise the temperature from room temperature to 80°C and keep it for 30 minutes to remove residual water molecules and low-boiling organic matter to obtain a transparent solution. Then the temperature was raised to 200°C and kept for 20 minutes. Measure the selenium (Se) precursor solution (including 63mg (0.8mmol) Se, 1mL ODE and 1mL oleylamine (OLA)) into the three-necked bottle quickly, keep growing at the injection temperature for 40min, and obtain Cu:Zn-In- Se quantum dot nuclei. Rapidly lowering to 132°C stops the crystal nucleus from continuing to grow. At this temperature, 1 mL of zinc precursor solution (containing 0.2 mmol of zinc acetate (Zn(Ac) 2 and 1mL ODE, 1mL OLA) were quickly added...

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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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Patent Type & Authority Patents(China)
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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