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Preparation method and application of dual-emission nitrogen-doped fluorescent carbon dots

A technology of fluorescent carbon dots and nitrogen doping, applied in luminescent materials, chemical instruments and methods, thermometers with physical/chemical changes, etc., to achieve the effects of low cost, excellent fluorescence quality, and easy availability of raw materials

Pending Publication Date: 2022-03-22
HANGZHOU DIANZI UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that most existing doped fluorescent carbon dots only have single-wavelength emission and the synthesis method of dual-wavelength fluorescent carbon dots. When single-emitting fluorescent carbon dots are applied to white light illumination, multiple monochrome carbon dots are required. mixed defects, and provide a preparation method of dual-emission nitrogen-doped fluorescent carbon dots and its application in the fields of white light emission and temperature sensing. The preparation method of the present invention is simple, requires very few raw materials, takes short time, and produces With less by-products, low cost, economical and environmental protection, the dual-emission nitrogen-doped fluorescent carbon dots prepared by the present invention have ideal performance and strong application value

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  • Preparation method and application of dual-emission nitrogen-doped fluorescent carbon dots
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  • Preparation method and application of dual-emission nitrogen-doped fluorescent carbon dots

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Embodiment 1

[0031] This embodiment provides a method for preparing double-emitting nitrogen-doped fluorescent carbon dots, comprising the following steps:

[0032] 1) Weigh 0.5g of citric acid and 5g of urea, dissolve them in 30mL of N,N-dimethylformamide solvent, stir thoroughly to obtain a mixed solution, pour the mixed solution into a 50mL autoclave, seal it and place it in a blast In the drying oven, heat up to 160°C and heat the solvent to react for 6 hours, then cool naturally;

[0033] 2) The above carbon dot solution was centrifuged at 8000r / min for 30min, and then dialyzed with a dialysis bag with a molecular weight cutoff of 1000Da for 24h to obtain nitrogen-doped blue / yellow dual-wavelength fluorescent carbon dots. The fluorescence emission spectrum of carbon dots obtained under 330nm excitation is as follows figure 1 shown.

[0034] 3) Calculate and fit the fluorescence spectrum of the carbon dots prepared above under 330nm excitation, and obtain the corresponding CIE chroma...

Embodiment 2

[0036] Compared with Example 1, this example differs in that the mass ratio of citric acid to urea is 1:4, and the rest are identical to Example 1. The obtained carbon dot fluorescence emission spectrum is as follows figure 1 As shown, the corresponding CIE chromaticity coordinates obtained are (0.31, 0.29), such as figure 2 shown.

Embodiment 3

[0038] Compared with Example 2, this example differs in that the mass ratio of citric acid to urea is 1:3, and the rest are identical to Example 1. The obtained carbon dot fluorescence emission spectrum is as follows figure 1 As shown, the corresponding CIE chromaticity coordinates obtained are (0.30, 0.28), such as figure 2 shown.

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Abstract

The invention discloses a preparation method and application of dual-emission nitrogen-doped fluorescent carbon dots, the dual-emission nitrogen-doped fluorescent carbon dots are prepared by a solvothermal method, the fluorescent carbon dots have dual fluorescence emission wavelengths of 440 nm and 580 nm simultaneously under ultraviolet excitation, the fluorescence intensity proportion of the dual wavelengths is adjustable, and the dual-emission nitrogen-doped fluorescent carbon dots can be used for white light emission and temperature sensors. The fluorescent carbon dot disclosed by the invention has good fluorescence performance, particularly, the white carbon dot can achieve emission of pure white light (CIE coordinate 1931 (0.33, 0.33)), and is expected to be applied to the field of illumination. And the temperature range of 15-65 DEG C can be detected, and the temperature sensing performance is good.

Description

technical field [0001] The invention relates to the field of fluorescent nanomaterials, in particular to a preparation method of double-emitting nitrogen-doped fluorescent carbon dots and its application in the fields of white light emission and temperature sensing. Background technique [0002] As a new type of zero-dimensional nanoluminescent material, carbon dots have many advantages. Such as facile preparation, low cost, excellent optical properties, good biocompatibility, and low toxicity, which make them attract much attention in chemical sensing, bioanalytical detection, and optoelectronic device applications. In recent years, in order to further regulate the fluorescence properties of carbon dots and improve their fluorescence quality, researchers usually use strategies such as doping and surface modification. As one of the most effective and simple regulation measures at present, heteroatom doping can change the structure of carbon dots, thereby directly and effect...

Claims

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Application Information

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IPC IPC(8): C09K11/65G01K11/20
CPCC09K11/0883C09K11/65G01K11/20Y02B20/00
Inventor 王海洋江源张阳
Owner HANGZHOU DIANZI UNIV
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