Selenium precursor fluid and method for preparing cadmium selenide or zinc selenide quantum dots by using the same

A technology of precursor liquid and quantum dots, which is applied in the direction of chemical instruments and methods, luminescent materials, etc., can solve the problems of high cost of alkylphosphine process, high cost of phosphine-free process, danger of environmental pollution, etc., and achieve good crystallinity and compatibility Good, high volumetric yield results

Inactive Publication Date: 2008-05-28
HEFEI UNIV OF TECH
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Problems solved by technology

[0005] In short, the disadvantages of the current synthesis process of selenide quantum dots (including cadmium selenide / zinc) are: ① The cost of the alkylphosphine process is high, and there is a risk of environmental pollution; ② The cost of the existing phosphine-free process is high

Method used

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  • Selenium precursor fluid and method for preparing cadmium selenide or zinc selenide quantum dots by using the same
  • Selenium precursor fluid and method for preparing cadmium selenide or zinc selenide quantum dots by using the same
  • Selenium precursor fluid and method for preparing cadmium selenide or zinc selenide quantum dots by using the same

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Embodiment Construction

[0034] 1. Preparation of Se precursor solution

[0035] Take 0.100 g of selenium powder and add it to 4 ml of oleoyl morpholine, heat it to 220-230 ° C under the protection of Ar gas, and keep it warm for 1 hour to obtain a completely transparent brown-red solution. Stop heating, and continue cooling to room temperature under the protection of Ar gas. Set aside.

[0036] 2. Synthesis of CdSe quantum dots and ZnSe quantum dots

[0037] (1) Preparation of cadmium selenide in oleoylmorpholine medium

[0038] Preparation of cadmium solution and preparation of quantum dots: 1.000 g of cadmium oleate, 2 ml of oleic acid, 2 ml of dodecyldimethylamine and 8 ml of oleoyl morpholine were mixed, heated to 150° C., and vacuum dehydrated for 0.5 hours. After dehydration, fill with Ar gas protection and heat to 250°C, add Se precursor solution, lower the temperature to about 220-230°C, keep warm at 230±5°C for 1min to 10min (the time is determined according to the size of the product requi...

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Abstract

Provided is a selenium precursor liquid which is achieved by the preparation of heating and dissolving the elemental selenium in oleoyl morpholine under the protection of inert gas. The process for the preparation of cadmium selenide or zinc selenide quantum dots with the selenium precursor liquid is to generate pyrolytic reaction by stirring and mixing the selenium precursor liquid and fatty acid cadmium or fatty acid zincum precursor liquid under the protection of inert gas at a temperature of 150 DEG C to 330 DEG C, and the last is to separate and purify the mixture with low carbon alcohols. The dissolving capacity of the oleoyl morpholine for the elemental selenium is strong, the compatibility of the oleoyl morpholine with other green common solvents is perfect, which can increase the volume productivity of selenide nanocrystalline, thereby achieving quantum dots with relatively narrower size and higher quality.

Description

1. Technical field [0001] The invention relates to an intermediate raw material used for preparing semiconductor nanomaterials and a method for preparing semiconductor nanomaterials with the intermediate raw material, specifically a selenium precursor solution and a method for preparing cadmium selenide or zinc selenide quantum dots. 2. Background technology [0002] Quantum dots are semiconductor nanocrystals whose size is smaller than the Bohr diameter of the corresponding material. Quantum dots are a new class of functional materials with broad application prospects due to their physical and chemical properties related to size and shape. Due to their good photoelectric properties, selenide quantum dots can be used in photodiodes, solar cells, single-electron lasers, biolabels and other fields. The controllable synthesis of selenide quantum dots is the focus of extensive research in recent years, and the synthesis of cadmium selenide, zinc selenide and their alloys and do...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88
Inventor 蒋阳王春张忠平李国华
Owner HEFEI UNIV OF TECH
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