Nickeliferous fluorescent quantum dot and preparation method and application thereof

A fluorescent quantum dot, quantum dot technology, applied in photosensitive equipment, chemical instruments and methods, luminescent materials, etc., can solve the problems of limited variety of quantum dots, the stay of nickel-containing semiconductor materials, and the limitation of quantum dot theory expansion and improvement. The effect of good fluorescence stability and high luminous efficiency

Active Publication Date: 2012-09-26
NANJING UNIV OF TECH
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Problems solved by technology

[0003] Although the research on quantum dots has been developed for decades, the varieties of quantum dots are still relatively limited. At present, the most in-depth research on the theory and application of quantum dots is only II-VI and III-V semiconductor nanocrystals, such as CdS, ZnS, CdTe, CdSe, InP, etc., which greatly limit the expansion and improvement of quantum dot theo

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  • Nickeliferous fluorescent quantum dot and preparation method and application thereof
  • Nickeliferous fluorescent quantum dot and preparation method and application thereof
  • Nickeliferous fluorescent quantum dot and preparation method and application thereof

Examples

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Example Embodiment

[0032] Example 1

[0033] 1. Preparation of Reaction Precursor

[0034] Weigh 0.238g NiCl 2 After dissolving in 30g of deionized water, add a toluene solution in which 1g of oleic acid is dissolved in the system, fully stir to form a water-oil reaction system, and then heat to 70°C for 1 hour under nitrogen gas to obtain a reaction precursor solution.

[0035] 2. Preparation of NiSe quantum dots

[0036] Weigh 0.0227g NaBH 4 and 0.4g of Se powder, dissolved in 1g of pure water, and reacted in an ice-water bath for about 5 hours to obtain a purple-red NaHSe solution, which was then injected into the reaction precursor solution under a hot nitrogen atmosphere, and the reaction was stopped after 10 hours. Take the upper toluene phase solution and precipitate it with a large amount of ethanol, centrifuge at 8000 rpm for 15 minutes and then disperse it in toluene. After repeated repetitions, a blue fluorescent NiSe quantum dot solution is obtained.

[0037] 3. Construction of q...

Example Embodiment

[0039] Example 2

[0040] 1. Preparation of Reaction Precursor

[0041] Weigh 0.238g NiCl 2 After dissolving in 30g of deionized water, add toluene solution in which 0.8g of undecylenic acid is dissolved in the system, fully stir to form a water-oil reaction system, and then heat to 90°C for 1 hour under nitrogen gas to obtain a reaction precursor solution.

[0042] 2. Preparation of NiSe quantum dots

[0043] Weigh 0.0227g NaBH 4 and 0.4g of Se powder, dissolved in 1g of pure water, and reacted in an ice bath for about 5 hours to obtain a purple-red NaHSe solution, which was then injected into the reaction precursor solution under a hot nitrogen atmosphere, and the reaction was stopped after 20 hours. Take the upper toluene phase solution and precipitate it with a large amount of ethanol, centrifuge at 8000 rpm for 15 minutes and then disperse it in toluene. After repeated repetitions, a yellow fluorescent NiSe quantum dot solution is obtained.

[0044] 3. Fabrication of ...

Example Embodiment

[0046] Example 3

[0047] 1. Preparation of Reaction Precursor

[0048] Weigh 0.47g NiCl 2 After dissolving in 30g of deionized water, add a toluene solution in which 2g of oleic acid is dissolved in the system, fully stir to form a water-oil reaction system, and heat to 70°C after nitrogen gas for 1h to obtain a reaction precursor solution.

[0049] 2. Preparation of NiTe quantum dots

[0050] Weigh 0.0227g NaBH 4 and 0.3g of Te powder, dissolved in 1g of pure water and reacted in an ice bath for about 5 hours to obtain a deep purple NaHTe solution, which was then injected into the reaction precursor solution under a hot nitrogen atmosphere, and the reaction was stopped after 10 hours. Take the upper toluene phase solution and precipitate it with a large amount of ethanol, centrifuge at 8000 rpm for 15 minutes and then disperse it in toluene. After repeated repetitions, a blue fluorescent NiTe quantum dot solution is obtained.

[0051] 3. Construction of NiTe quantum dot-...

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Abstract

The invention discloses a nickeliferous fluorescent quantum dot which is low in toxicity, has wide absorption spectrum and narrow fluorescence emission spectrum, and is adjustable in luminous color along with excitation wavelength, high in luminous efficiency, high in stability and applicable to construction of quantum dot-sensitized solar cells and LED devices. The nickeliferous fluorescent quantum dot comprises one of or combination of nickel selenide, nickel telluride and nickel sulfide, the quantum dot particle size ranges from 2nm to 20nm, the quantum yield is 10-60%, and the half-peak width of a photoluminescence spectrum is 30-130nm. Preferably, the NiSe fluorescent quantum dot is optimal when x=0.5.

Description

technical field [0001] The invention relates to a semiconductor fluorescent nanometer material, a preparation method and an application thereof, in particular to a nickel-containing fluorescent quantum dot, a preparation method and an application thereof. Background technique [0002] Semiconductor nanocrystals (also known as quantum dots), whose particle size is generally between 1-20nm, are one of the important members of nanomaterials. The average particle size of nanocrystals is small, the surface atoms are many, the specific surface area is large, and the surface energy is high, resulting in their properties being different from single atoms, molecules, and ordinary particle materials, and showing unique small size effects and surface effects. And the macroscopic quantum tunneling effect, showing unique advantages in the fields of light, electricity, magnetism, heat and catalysis. There are many methods for preparing quantum dots, and the mainstream methods are organom...

Claims

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Application Information

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IPC IPC(8): C09K11/88C09K11/60H01L33/28H01G9/20
Inventor 陈苏朱琳
Owner NANJING UNIV OF TECH
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