Nickeliferous fluorescent quantum dot and preparation method and application thereof

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...

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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 theory and practical applications, so the development of a new class of quantum dot materials will be of far-reaching significance

At present, most of the research on nickel-containing semiconductor materials stays at the level of macroscopic bulk materials, and only a few studies involve the nanoscale of the material, and there is no report on nickel-containing fluorescent quantum dots.

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