Nitrogen-doped carbon dot and rare earth-coordinated multicolor adjustable light-emitting composite material and multicolor light-converting agricultural film prepared therefrom

A technology of nitrogen-doped carbon dots and composite materials, applied in the field of agricultural materials, can solve the problems of difficult processing of rare earth complexes, single fluorescent color, small absorption coefficient, etc., and achieve the goal of improving yield and quality, increasing light absorption rate, and promoting growth Effect

Inactive Publication Date: 2019-05-21
SHANDONG AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the small absorption coefficient of rare earth ions in the ultraviolet and visible light regions, the rare earth complexes are difficult to process, the fluorescence color is relatively single, the fluorescence is easy to quench, and the disadvantages such as high cost limit its wide application.

Method used

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  • Nitrogen-doped carbon dot and rare earth-coordinated multicolor adjustable light-emitting composite material and multicolor light-converting agricultural film prepared therefrom
  • Nitrogen-doped carbon dot and rare earth-coordinated multicolor adjustable light-emitting composite material and multicolor light-converting agricultural film prepared therefrom
  • Nitrogen-doped carbon dot and rare earth-coordinated multicolor adjustable light-emitting composite material and multicolor light-converting agricultural film prepared therefrom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] According to a synthesis method of nitrogen-doped fluorescent carbon dots disclosed in CN 104528692A patent literature, it uses L-arginine as a carbon source and nitrogen source, citric acid as an auxiliary agent, and adopts a hydrothermal synthesis method to synthesize nitrogen-doped fluorescent carbon dots in one step. quantum dots. Prepare ethanol solution A containing 1.0g of nitrogen-doped carbon dots; prepare ethanol solution B containing 3.0g of europium nitrate; Ethanol solution C; prepare NaOH aqueous solution D containing 1mol / L; slowly add an appropriate amount of solution B to an appropriate amount of solution A under stirring, and continue stirring at a stirring speed of 4000 rpm to obtain solution E, and slowly add an appropriate amount of solution C to Add dropwise to solution E, slowly add solution D dropwise to solution E under stirring until pH = 6.5-7.0, stir and react in a water bath at 60°C for 3 hours, let stand for 10 hours, centrifuge the reactio...

Embodiment 2

[0039] A proper amount of cellulose was used as a carbon source, and acetic acid solution was added, heated at 180° C. for 12 hours in a hydrothermal reaction vessel, and then filtered and freeze-dried to obtain a nitrogen-doped carbon dot precursor. The nitrogen-doped carbon dot precursor is formulated into 3.0g / L nitrogen-doped carbon dot ethanol solution A; the ethanol solution B containing 3.0g of samarium nitrate is prepared; the preparation contains 10.0g of 2-thienoyltrifluoroacetone and The ethanol solution C of the o-phenanthroline of 5.0g; Preparation contains the NaOH aqueous solution D of 1mol / L; Under stirring, the appropriate amount of solution B is slowly added dropwise in the appropriate amount of solution A, and the stirring speed is continuously stirred at 4000 rpm to obtain For solution E, add an appropriate amount of solution C slowly dropwise to solution E, slowly add solution D dropwise to solution E under stirring until pH = 6.5-7.0, stir and react in a w...

Embodiment 3

[0042] The nitrogen-doped carbon dot precursor is prepared by using hair as a raw material, reacting in a hydrothermal method at 180° C. to 200° C. for 4 to 8 hours, and then suction-filtering and freeze-drying. The nitrogen-doped carbon dot precursor was formulated into ethanol solution A containing 5.0g of nitrogen-doped carbon dots; the ethanol solution B containing 4.0g of europium nitrate was prepared; The ethanol solution C of phenanthroline; the preparation contains the NaOH aqueous solution D of 1mol / L; Under stirring, an appropriate amount of solution B is slowly added dropwise to an appropriate amount of solution A, and the stirring speed is continuously stirred at 4000 rpm to obtain solution E. An appropriate amount of solution C is slowly added dropwise to solution E, and solution D is slowly added dropwise to solution E under stirring until pH = 6.5-7.0, stirred and reacted in a water bath at 60°C for 6 hours, left standing for 10 hours, and the reaction product is...

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Abstract

The invention belongs to the field of agricultural materials, and particularly relates to a nitrogen-doped carbon dot and rare earth-coordinated multicolor adjustable light-emitting composite material, a multicolor light-converting agricultural film prepared from the same and a preparation method thereof. By virtue of modificability of surface functional groups of nitrogen-doped carbon dots, a coordination compound of a rare earth element is connected to the surfaces of the nitrogen-doped carbon dots; due to regulatability of the fluorescence of the nitrogen-doped carbon dots, the emission wavelength of the fluorescence is controlled by changing the excitation wavelength of the fluorescence of the nitrogen-doped carbon dots, so that the energy of the nitrogen-doped carbon dots is matched with the energy of the rare earth element, the light-converting efficiency is improved, the diversity of fluorescent colors is improved, and thus the light-converting efficiency and the light-converting quality of the light-emitting composite material are improved; and the multicolor light-converting agricultural film prepared by the preparation method is simple in preparation, easy to operate, wide in raw material sources and environment-friendly, and can be applied to agricultural production for promoting growth of various crops, increasing the yield of the crops and improving the quality ofthe crops.

Description

technical field [0001] The invention belongs to the field of agricultural materials, and in particular relates to a nitrogen-doped carbon dot coordinated rare earth multi-color adjustable light-emitting composite material and a multi-color light-converting agricultural film prepared therefrom. Background technique [0002] Light-changing agricultural film is a new type of functional agricultural film that can convert ultraviolet light and green light that are harmful or useless to plant photosynthesis in sunlight into red light and blue light required for photosynthesis. Currently commonly used light conversion materials are mainly divided into organic dyes, inorganic salts, and rare earth complexes. Organic-inorganic composite light-converting materials that are cheap, have high light conversion efficiency, and have good compatibility with polymer materials are the focus of the future development of light-converting agricultural films. [0003] Carbon dots (also known as c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/06C08L23/06C08K5/00
Inventor 艾仕云田清源毛季郭曼莉周君沈小超
Owner SHANDONG AGRICULTURAL UNIVERSITY
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