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Ce-doped water-soluble CdTe quantum dot synthetic method

A synthesis method and technology of quantum dots, applied in the nano field, can solve the problems of unsafe preparation process and complicated operation, and achieve the effects of easy control, simple operation steps and mild synthesis conditions.

Inactive Publication Date: 2014-07-23
南宁市鼎光电子有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, most of the doping-type preparation methods of CdTe quantum dots in the general aqueous phase synthesis method still need to prepare NaHTe precursors in the preparation process, the operation is relatively complicated, and sometimes toxic gas H 2 Te, making the preparation process unsafe, and there are many matters needing attention during operation
However, the preparation and luminescent properties of CdTe quantum dots doped with Ce have not been reported yet.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Measure 98ml of 0.02mol / L cadmium chloride and 2ml of 0.02mol / L cerium ammonium nitrate solution, and put them into three-necked flasks respectively. One port of the three-necked flask is connected to a pipeline for inert gas, and a magnetic stirrer is placed at the middle port The stirring bar of the device, the other port is connected to the gas outflow pipeline, stirred with a magnetic stirrer for 10min, and then added 0.2579g of stabilizer thioglycolic acid (TGA), where (Cd 2+ +Ce 3+ ): The molar ratio of TGA is 1:1.4, and the precursor solution of metal ions is obtained after mixing evenly;

[0029] (2) Nitrogen is passed into the metal ion precursor solution obtained in step (1) to remove oxygen in the bottle, add 0.0096g sodium borohydride, adjust the pH value of the solution to 8.0 with sodium hydroxide, add 0.0313g tellurium dioxide, wherein two The molar ratio of tellurium oxide to sodium borohydride is 1:1.3, TeO 2 with Cd 2+ The molar ratio is 1:10; ...

Embodiment 2

[0033] (1) Measure 97ml of 0.02mol / L cadmium nitrate and 3ml of 0.02mol / L cerium nitrate solution, and put them into three-necked flasks respectively. One of the three-necked flasks is connected to a pipeline for inert gas, and a magnetic stirrer is placed at the middle of the bottle. Stirring bar, the other port is connected to the gas outflow pipeline, stirred with a magnetic stirrer for 8min, and then added 0.5159g of stabilizer thioglycolic acid (TGA), wherein (Cd 2+ +Ce 3+ ): The molar ratio of TGA is 1:2.8, and the precursor solution of metal ions is obtained after mixing evenly;

[0034] (2) Nitrogen is passed into the metal ion precursor solution gained in step (1) to remove oxygen in the bottle, add 0.0220g sodium borohydride, adjust the pH value of the solution to 8.0 with sodium hydroxide, add 0.0309g tellurium dioxide, wherein two The molar ratio of tellurium oxide to sodium borohydride is 1:3, TeO 2 with Cd 2+ The molar ratio is 1:10;

[0035](3) Fully magneti...

Embodiment 3

[0038] (1) Measure 96ml of 0.02mol / L cadmium perchlorate and 4ml of 0.02mol / L cerium ammonium nitrate solution, and put them into three-necked flasks respectively. One port of the three-necked flask is connected to a pipeline for inert gas, and a magnetic force is placed in the middle port. The stirring bar of the stirrer, the other port is connected to the gas outflow pipeline, stir with a magnetic stirrer for 12min, then add 0.7370g stabilizer thioglycolic acid (TGA), where (Cd 2+ +Ce 3+ ): The molar ratio of TGA is 1:4, and the precursor solution of metal ions is obtained after mixing evenly;

[0039] (2) Pass helium into the metal ion precursor solution obtained in step (1) to remove oxygen in the bottle, add 0.0436g sodium borohydride, adjust the pH value of the solution to 9.0 with sodium hydroxide, add 0.0306g tellurium dioxide, wherein The molar ratio of tellurium dioxide to sodium borohydride is 1:6, TeO 2 with Cd 2+ The molar ratio is 1:10;

[0040] (3) Fully sti...

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Abstract

The invention relates to a Ce-doped water-soluble CdTe quantum dot synthetic method, which selects soluble cadmium salt as a cadmium source, tellurium dioxide as a tellurium source and mercaptoacetic acid as a stabilizing agent, and the Ce-doped water-soluble CdTe quantum dot is synthesized in a water phase system. The synthetic method has the advantages of simple and safe process. Compared with a traditional water phase synthesis approach, in the invention, preparation of a NaHTe precursor is not required, no H2Te toxic gas is discharged in a whole synthesis process, and the synthesis method has the characteristics of mild synthesis condition, easy control, simpleness, rapidity and environmental protection. maximum fluorescence emission wavelength of CdTe: Ce quantum dot enables obvious bathochromic shift, the fluorescence emission peak scope of the rare earth Ce-doped water-soluble CdTe quantum dot is 540-570nm, and the particle size is 3-5nm.

Description

technical field [0001] The invention relates to the field of nanotechnology, in particular to a method for synthesizing Ce-doped water-soluble CdTe quantum dots. Background technique [0002] Small semiconductor nanocrystals are also called quantum dots. Quantum dots are composed of a small number of atoms and are quasi-zero-dimensional nanomaterials. The particle size of quantum dots is generally below 10nm. Since holes and electrons are quantum-confined, the original continuous energy band structure will become a discrete energy level structure with molecular characteristics, which can emit fluorescence after being excited. Quantum dot materials have broad application prospects in solar cells, optical biomarkers, and especially in the field of light-emitting devices. At present, quantum dot LEDs can achieve a nearly continuous spectrum, which can improve the quality of LED backlights and reduce costs. It is expected to enhance the color rendering and wide color gamut of L...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88B82Y30/00
Inventor 黄济民周丽亚王荣芳
Owner 南宁市鼎光电子有限责任公司
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