Water-soluble copper-and-manganese-codoped ZnS(Se) white-light quantum dot and preparation method thereof

A co-doping and water-soluble technology, applied in chemical instruments and methods, luminescent materials, climate sustainability, etc., can solve the problems of low efficiency of multi-layer structure, complex preparation process, change of white light, etc., and achieve good water solubility. , the reaction conditions are simple, the effect of low toxicity

Inactive Publication Date: 2015-05-13
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, traditional methods for obtaining white light from LEDs are mostly achieved through a multi-layer structure, that is, the method of stacking three light-emitting layers of red, green, and blue is used to obtain white light by mixing the three primary colors. Changes with voltage changes, multi-layer structure self-absorption, low efficiency and other obvious shortcomings

Method used

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  • Water-soluble copper-and-manganese-codoped ZnS(Se) white-light quantum dot and preparation method thereof
  • Water-soluble copper-and-manganese-codoped ZnS(Se) white-light quantum dot and preparation method thereof

Examples

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Effect test

Embodiment 1

[0021] First, the preparation of zinc chloride and cysteine ​​aqueous solution: add 80ml deionized water and 0.8mol / L zinc chloride solution to cysteine ​​in a three-necked flask, wherein zinc chloride and cysteine The molar ratio is 1:2;

[0022] Second, add the manganese chloride solution of 0.05mol / L and the cupric chloride solution of 0.05mol / L in the first step solution, wherein the mol ratio of manganese chloride and zinc chloride is 1:100, cupric chloride and The mol ratio of zinc chloride is 0.5:100, and the solution is stirred for 20min under nitrogen protection;

[0023] Third, adjust the pH value of the second step solution to 9 with NaOH aqueous solution, and quickly inject 0.8mol / L sodium sulfide solution, wherein the molar ratio of sodium sulfide to zinc chloride is 1:1, and stir rapidly for 20min;

[0024] Fourth, transfer the solution in the third step to a microwave reactor, raise the temperature to 60 degrees Celsius, and react for 30 minutes to obtain coppe...

Embodiment 2

[0027] First, the preparation of zinc chloride and thioglycolic acid aqueous solution: add 100ml deionized water and 1mol / L zinc chloride solution to thioglycolic acid in a three-necked flask, wherein the mol ratio of zinc chloride to thioglycolic acid is 1:5 ;

[0028] Second, add the manganese chloride solution of 0.1mol / L and the cupric chloride solution of 0.1mol / L in the first step solution, wherein the mol ratio of manganese chloride and zinc chloride is 5:100, cupric chloride and The mol ratio of zinc chloride is 3:100, and the solution is stirred for 30min under nitrogen protection;

[0029] Third, adjust the pH value of the second-step solution to 12 with NaOH aqueous solution, and quickly inject 1mol / L sodium sulfide solution, wherein the molar ratio of sodium sulfide to zinc chloride is 1:1, and stir rapidly for 30min;

[0030] Fourth, transfer the solution in the third step to a microwave reactor, raise the temperature to 40 degrees Celsius, and react for 3 hours ...

Embodiment 3

[0033] First, the preparation of zinc chloride and mercaptopropionic acid aqueous solution: add 100ml deionized water and 1mol / L zinc salt aqueous solution to mercaptopropionic acid in a three-necked flask, wherein the mol ratio of zinc chloride to mercaptopropionic acid is 1 :1;

[0034] Second, add the manganese chloride solution of 0.1mol / L and the cupric chloride solution of 0.05mol / L in the first step solution, wherein the mol ratio of manganese chloride and zinc chloride is 1:100, cupric chloride and The mol ratio of zinc chloride is 0.5:100, and the solution is stirred for 30min under nitrogen protection;

[0035] The 3rd, the pH value of the second step solution is adjusted to 10 with NaOH aqueous solution, and inject the sodium selenium hydride solution of freshly prepared 1mol / L rapidly, wherein the mol ratio of sodium selenium hydride and zinc chloride is 1:1, quickly Stir for 20min;

[0036] Fourth, transfer the solution in the third step to a microwave reactor, ...

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Abstract

The invention belongs to the technical field of quantum dot light-emitting materials, and particularly discloses a water-soluble copper-and-manganese-codoped ZnS(Se) white-light quantum dot and a preparation method thereof. The method comprises steps as follows: firstly, a reaction precursor solution is prepared and adjusted to a proper pH value, and then the copper-and-manganese-codoped ZnS(Se) quantum dot is obtained through microwave-assisted heating. The method is simple to operate and environment-friendly, conditions are mild, and the cost is low. The prepared copper-and-manganese-codoped ZnS(Se) quantum dot is good in water-solubility and stability, higher in quantum yield and capable of being excited to directly emit white light under the certain wavelength or the certain voltage.

Description

technical field [0001] The invention belongs to the technical field of quantum dot luminescent materials, and in particular relates to a white light quantum dot luminescent material and a preparation method thereof. technical background [0002] Quantum dots are quasi-zero-dimensional nano-semiconductor materials, which are composed of a small number of atoms or atomic groups, and usually have a three-dimensional scale of 1 to 10 nm. Due to the influence of quantum size effect and dielectric confinement effect, it shows many unique optical and electrical properties, making quantum dots have broad application prospects in the field of optoelectronics and biomedicine. Quantum dot electroluminescent devices have the advantages of low power consumption, high efficiency, fast response and high sensitivity, and have shown great academic value and good commercial prospects in the field of LED lighting. [0003] The research on quantum dot luminescent materials has achieved many re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88C09K11/58C09K11/56
CPCY02B20/00
Inventor 梅时良陈秋行贺良杰张万路张节郭睿倩
Owner FUDAN UNIV
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