Prepn. method of low toxicity CdSe/ZnSe nucleocapsid quantal-points

A technology of core-shell quantum dots and low toxicity, which is applied in the preparation of semiconductor CdSe/ZnSe core-shell nanomaterials and the field of fluorescent nanomaterials. It can solve the problems of quantum dot instability, large surface defects, and impact on safety, and achieve low prices. , good monodispersity, and the effect of raw material safety

Inactive Publication Date: 2006-09-13
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

Qu L.H. et al. used CdO, Cd(Ac) 2 , CdCO 3 Weak acid salt of cadmium and selenium powder were used as raw materials, and II-VI quantum dots with excellent performance were synthesized with tri-n-octylphosphine oxide (TOPO), hexadecylamine (HDA), and stearic acid as solvents, but due to The strong toxicity of tri-n-octylphosphine oxide and the instability and large surface defects of quantum dots seriously affect its safety and quantum yield.

Method used

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  • Prepn. method of low toxicity CdSe/ZnSe nucleocapsid quantal-points
  • Prepn. method of low toxicity CdSe/ZnSe nucleocapsid quantal-points

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Embodiment

[0016] 1. Weigh 0.079g of selenium powder with a weight percentage of 3.33%, put it into a penicillin bottle, add 1ml tri-n-octylphosphine, 33.55% by weight, and 2ml octadecene, 63.12% by weight, after sealing Ultrasonic for about 30 minutes to dissolve all the selenium powder to prepare a selenium stock solution.

[0017] 2. Weigh 0.318 g of zinc stearate with a weight percentage of 8.4%, put it into a penicillin bottle, add 4 ml of toluene, and keep it in a 60°C water bath for 10 minutes to prepare a zinc stock solution.

[0018] 3. Weighing CdO is 0.0256g, weight percentage is 0.6%, stearic acid is 0.228g, weight percentage is 5.37%, and 2.4ml octadecene, weight percentage is 44.6%, put into the three-necked bottle, magnetic force Fill with nitrogen while stirring, heat to 200° C. with a heating mantle and hold for 5 minutes until the solution is a colorless and transparent solution; then naturally cool down to room temperature. Preparation of cadmium precursors. Add 1.5 ...

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Abstract

This invention relates to low toxicity CdSe/ZnSe core shell quanta point preparation method, it belongs to luminescent material technique field. First Cd0, stearic acid and octadecene are used to make cadmium precursor solution under nitrogen gas condition. Then selenium stock solution is prepared by fill selenium powder, positive three octyl phosphine and octadecene into sealing tank. Zinc stock solution is made by dissolve zinc into 4ml toluene. Oxide positive three octyl phosphine and hexadecyl amine are filled in the cadmium solution, the selenium stock solution is cooled down under nitrogen gas condition to get CdSe quanta point. Then zinc stearate stock solution is added and cooled down to 30-50 degrees centigrade to get CdSe/ZnSe core shell quanta point. The operation of this invention is simple, cost is low and high efficiency quanta point is get. Quanta yield ratio is advanced from 2-10% before cladding to more than 60% after cladding.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, relates to fluorescent nanomaterials, and is a preparation method of semiconductor CdSe / ZnSe core-shell nanomaterials. The invention adopts the high-temperature organic solvent of octadecene (ODE) to prepare CdSe / ZnSe core-shell quantum dots with high efficiency and low toxicity. Background technique [0002] In recent years, semiconductor wide-bandgap group II-VI quantum dot materials have been fabricated by various methods, and they have shown attractive application prospects in optoelectronic devices, such as light-emitting diodes, quantum dot lasers, and biological probes. As well as optical converters or modulators, etc. Since Nie et al. reported on CdSe quantum dots in Science in 1998, II-VI, III-V semiconductor nanomaterials (CdSe, CdS, CdTe, ZnSe, InP, GaAs, etc.) Scholars at home and abroad have attached great importance to it, and have also achieved gratifying achievemen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/54
Inventor 曾庆辉孔祥贵刘瑞麟张友林
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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