Process for preparing CdTe nanocrystal with high photoluminescent efficiency by hydrothermal technique

A nanocrystal and luminescence technology, applied in chemical instruments and methods, single crystal growth, single crystal growth, etc., can solve problems such as low quantum efficiency, not very good spectral characteristics, and many surface defects, so as to improve product quality, The effect of shortening the thermal growth cycle

Inactive Publication Date: 2003-10-29
JILIN UNIV
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Problems solved by technology

The disadvantage of this method is that the spectral characteristics are not very good, mainly manifested in relatively low quantum efficiency and broad fluorescence peaks, and post-treatments such as size-selective precipitation, selective photoetching, and surface modification are required to improve product quality.
It is always desired to directly synthesize higher quality water-soluble nanocrystals through one-step reaction. To achieve this goal, it is necessary to solve the problems of slow growth and many surface defects of nanocrystals in aqueous solution at normal temperature and pressure.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment one 1: with Te powder and NaBH 4 Preparation of NaHTe aqueous solution as raw material

[0026] Via Te powder and NaBH 4 Prepare NaHTe aqueous solution by reaction: first mix 80mg NaBH 4 Fully dissolve in 1ml of deionized water, then add 127.5mg of Te powder, leaving only one pinhole in the reaction system to discharge the hydrogen generated in the system, and react in an ice-water bath for 8 hours to obtain 1 N NaHTe aqueous solution. 2: with CdCl 2 , NaHTe, and thioglycolic acid as raw materials to synthesize CdTe nanocrystal precursor solution

[0027] Add 1.25×10 to 1000ml reaction system -3 M (moles) of CdCl 2 and 3×10 -3 M thioglycolic acid, adjust the pH to 9.0 with NaOH, and pass through N 2 Gas protection; add 0.25ml 1 NNaHTe aqueous solution under stirring condition; CdCl 2 , NaHTe, the molar ratio of thioglycolic acid is 1:0.2:2.4. Stirring was continued for 10 minutes to obtain a CdTe nanocrystal precursor solution. 3: Transfer of precur...

Embodiment 3

[0032] Embodiment three 1: Synthetic NaHTe method is as described in embodiment one 2: with CdCl 2 , NaHTe, and thioglycolic acid as raw materials to synthesize CdTe nanocrystal precursor solution

[0033] Add 0.01875M CdCl to 1000ml reaction system 2 and 0.045M thioglycolic acid, adjust the pH to 9.0 with NaOH, and pass N 2 Gas protection; add 3.75ml 1 N NaHTe aqueous solution under stirring condition; CdCl 2 , NaHTe, and thioglycolic acid in a molar ratio of 1:0.2:2.4. Stirring was continued for 10 minutes to obtain a CdTe nanocrystal precursor solution. 3: Transfer of precursor solution and heating growth

[0034] Take 40ml of the newly prepared CdTe precursor solution, put it into a 50ml reactor and seal it. Put the reaction kettle into a constant temperature oven at 180°C for heating, and obtain CdTe nanocrystals of various luminescent colors by controlling the discharge time. Due to the increase in the amount of each substance, the time required to obtain the same lu...

Embodiment 4

[0035] Embodiment four 1: Synthetic NaHTe method is as described in embodiment one 2: with CdCl 2 , NaHTe, and thioglycolic acid as raw materials to synthesize CdTe nanocrystal precursor solution

[0036] Add 1.25×10 to 1000ml reaction system -3 M CdCl 2 and 3×10 -3 M thioglycolic acid, adjust the pH to 9.0 with NaOH, and pass through N 2 Gas protection; add 0.625ml1 N NaHTe aqueous solution under stirring condition; CdCl 2 , NaHTe, the molar ratio of thioglycolic acid is 1:0.5:2.4. Stirring was continued for 10 minutes to obtain a CdTe nanocrystal precursor solution. 3: Transfer of precursor solution and heating growth

[0037] Take 40ml of the newly prepared CdTe precursor solution, put it into a 50ml reactor and seal it. Put the reaction kettle into a constant temperature oven at 180°C for heating, and obtain CdTe nanocrystals of various luminescent colors by controlling the discharge time. Due to the increase in the amount of NaHTe, the time required to obtain the ...

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Abstract

A process for preparing the nano CdTe crystal with high photoluminescent efficiency by hydrothermal technique includes preparing the precursor solution of water-soluble CdTe from CdCl2, NaHTe and mercaptoacetic acid or mercaptopropionic acid or mercaptoglycerine, and crystallizing growth of said solution in stainless steel reactor by heating to 100-200 deg.C, different temps can lead to differentcolors.

Description

technical field [0001] The invention relates to a method for preparing semiconductor nanocrystals with high photoluminescence efficiency by utilizing hydrothermal technology, in particular to a method for preparing water-soluble CdTe semiconductor nanocrystal precursors by using small thiol molecules as stabilizers, and nanocrystal precursors under high temperature and high pressure conditions A method for preparing CdTe semiconductor nanocrystals with high luminous efficiency by growing in a reactor. Background technique [0002] As a new type of material, semiconductor nanocrystals with high photoluminescence efficiency have broad application prospects in the field of bioluminescent labeling, because they have advantages that traditional organic dyes cannot match: first, due to the quantum size effect of nanoscale particles, As the particle size decreases, the emission color of nanocrystals changes from long wavelength to short wavelength (from red light to blue light); se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B7/10C30B29/48
Inventor 张皓杨柏
Owner JILIN UNIV
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