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A method for synthesizing blue-violet luminescent zncds/zns core-shell structure nanocrystals

A core-shell structure, nanocrystal technology, applied in nanotechnology, luminescent materials, nanotechnology and other directions, can solve the problems of complex blue-violet fluorescent nanocrystal process, harsh reaction conditions, poor synthesis quality, etc., achieving low cost and synthesis process. Simplified, easy-to-use effects

Active Publication Date: 2018-06-08
HENAN UNIVERSITY
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  • Application Information

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Problems solved by technology

Solve the problems of complex process, harsh reaction conditions, high synthesis cost and poor synthesis quality in the preparation of blue-violet fluorescent nanocrystals

Method used

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  • A method for synthesizing blue-violet luminescent zncds/zns core-shell structure nanocrystals
  • A method for synthesizing blue-violet luminescent zncds/zns core-shell structure nanocrystals
  • A method for synthesizing blue-violet luminescent zncds/zns core-shell structure nanocrystals

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Experimental program
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Embodiment 1

[0017] Synthesis of ZnCdS / ZnS core-shell structure nanocrystals: Take 0.2mmol of cadmium acetylacetonate, 2mmol of zinc acetylacetonate, 0.4mmol of octadecyl mercaptan, 10mmol of dodecyl mercaptan and 20mL of octadecene and mix them into a 100 mL three-neck flask , under the protection of nitrogen, when rapidly heated to 300 °C, after 3 minutes of reaction, the temperature was gradually raised to 310 °C for 1 hour to obtain ZnCdS / ZnS core-shell structure nanocrystals. The quantum yield is 83%, and the fluorescence absorption spectrum is as follows figure 1 , the change of XRD spectrum during the synthesis process is as follows figure 2 , TEM images such as image 3 .

Embodiment 2

[0019] The 400-490nm ZnCdS / ZnS core-shell structure nanocrystals can be covered by changing the different synthetic fluorescence spectra of the ratio of cadmium salt and zinc salt. The ratios of cadmium salt and zinc salt from left to right are 1:1, 1:3, 1:5, 1:10, 1:15, 1:20. The synthesis method is as in Example 1. The fluorescence spectra of ZnCdS / ZnS core-shell structure nanocrystals obtained in different ratios are as follows: Figure 4 shown.

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Abstract

The present invention uses ordinary cadmium salt and zinc salt as the precursors of cadmium and zinc to synthesize ZnCdS / ZnS core-shell structure nanocrystals with good blue-purple fluorescence, which is the most economical and environmentally friendly synthesis of high-quality ZnCdS / ZnS cores. A method for shell-structured nanocrystals. The synthesis process is simple, reproducible, safe and environmentally friendly, no glove box is required, and the cost can be saved by more than 60%. The fluorescence range of the synthesized ZnCdS / ZnS core-shell nanocrystals can be continuously adjusted from 400nm to 490nm. Uniform particle size distribution, high fluorescence quantum yield efficiency (50-100%), and narrow half-maximum width. More importantly, this method is suitable for large-scale synthesis of high-quality nanocrystals, so it has great application value in both laboratory synthesis and industrial synthesis.

Description

technical field [0001] The invention relates to a low-cost, environment-friendly, simple and controllable method for synthesizing semiconductor nanocrystals with good blue-violet fluorescence. The method can be produced on a large scale, so it has great value in industrial synthesis and application of blue-violet fluorescent nanocrystal materials. Background technique [0002] Semiconductor nanocrystals, especially Ⅱ-Ⅵ group fluorescent semiconductor nanoparticles are research hotspots in recent years. Fluorescence with different wavelengths can be produced by adjusting the size of nanocrystals, which makes their potential applications in biomolecular labeling and immunodetection, light-emitting diodes, lasers, solar cells, etc. attract much attention. In previous literature reports, people's main research focus is on the synthesis of nanocrystals in the visible light range (500-640nm). Applications of nanocrystalline light-emitting devices. In addition, in the existing s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/56C09K11/02B82Y30/00
Inventor 申怀彬李林松牛金钟
Owner HENAN UNIVERSITY
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