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Yellow-light carbon dot with high light and heat stability and preparation of yellow-light carbon dot

A technology of thermal stability and yellow light, applied in the field of fluorescent light-emitting materials, can solve the problem that the crystallinity needs to be further improved

Active Publication Date: 2021-09-10
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007]Ding et al. (Solvent-controlled synthesis of highly luminescent carbon dotswith a wide color gamut and narrowed emission peak widths[J].Small, 14 (22): 1800612.) Using o-phenylenediamine and L-glutamic acid as starting materials, formamide, N,N-dimethylformamide, ethanol, etc. as solvents, CDs were synthesized by solvothermal method, but its The XRD diffraction peak is broad, and the crystallinity needs to be further improved

Method used

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  • Yellow-light carbon dot with high light and heat stability and preparation of yellow-light carbon dot
  • Yellow-light carbon dot with high light and heat stability and preparation of yellow-light carbon dot
  • Yellow-light carbon dot with high light and heat stability and preparation of yellow-light carbon dot

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Weigh 0.42g of trimesic acid and 0.21g of o-phenylenediamine, add them into 30mL of absolute ethanol, ultrasonically dissolve them evenly, place them in a 100mL reaction kettle, and conduct solvothermal reaction in an oven at 200°C for 10h. After the reaction was completed, air-cooled to room temperature to obtain a brown carbon dot solution.

[0040] Take out the above-mentioned carbon dot solution, filter it with a 0.22 μm filter membrane, place the filtrate in a 500 Da dialysis bag, and perform dialysis treatment in absolute ethanol for 48 hours, during which the absolute ethanol is replaced every 8 hours to remove the fluorescent light in the filtrate. Molecules and other impurities are prepared to prepare yellow carbon dots with high photothermal stability.

[0041] In this example, the morphology, structure and particle size distribution of the prepared yellow carbon dots were firstly characterized by TEM. The appearance of yellow carbon dots is as follows figu...

Embodiment 2

[0056] Weigh 8mg of the carbon dot solid powder prepared in Example 1, add 1mL of absolute ethanol, after it is fully dissolved, continue to add 1mL of silane coupling agent KH-792 and 0.5mL of deionized water to the solution, ultrasonic 5min, make the solution Mix well to obtain a clear brown solution.

[0057] Add the above solution into a weighing bottle with a specification of 25×25 mm, and put it in an oven at 50° C. for 4 hours to dry.

[0058] After the solution in the weighing bottle became viscous, the solution was added dropwise onto a sapphire glass sheet, and placed in an oven at 60°C, and solidified after 8 hours to form a yellow carbon dot fluorescent film with bright yellow light emission.

[0059] The optical properties of the yellow carbon dot fluorescent film prepared above were investigated under the same conditions. Figure 7 (a) In the emission spectrum of the yellow carbon dot fluorescent film, as the excitation wavelength increases from 365nm to 485nm, ...

Embodiment 3

[0074] Weigh 0.21g of trimesic acid and 0.21g of o-phenylenediamine, add them into 40mL of absolute ethanol, ultrasonically dissolve them evenly, place them in a 100mL reaction kettle, and react in a solvothermal oven at 180°C for 12h. After the reaction was completed, air-cooled to room temperature to obtain a brown carbon dot solution.

[0075] Take out the above-mentioned carbon dot solution, filter it with a 0.22 μm filter membrane, place the filtrate in a dialysis bag of 500 Da, and perform dialysis treatment in absolute ethanol for 42 hours. Molecules and other impurities are prepared to prepare yellow carbon dots with high photothermal stability.

[0076] After the dialysis is finished, the solution in the dialysis bag is taken out and subjected to rotary evaporation treatment to obtain solid carbon dot powder.

[0077] Weigh 10mg of carbon dot solid powder, add 1.2mL of absolute ethanol, after it is fully dissolved, continue to add 1.1mL of silane coupling agent KH-79...

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Abstract

The invention relates to a yellow-light carbon dot with high light and heat stability, which is a carbon dot solution obtained by taking trimesic acid as a carbon source and o-phenylenediamine as a nitrogen source and carrying out solvothermal reaction in absolute ethyl alcohol. The yellow-light carbon dots prepared by the invention have bright yellow light emission and high light stability and thermal stability. The yellow-light carbon dot fluorescent film can be obtained by mixing and curing the yellow-light carbon dots and KH-792, can be used for preparing a high-energy white light LD device, and can be compounded with 450nm blue light LD to realize pure white light laser illumination.

Description

technical field [0001] The invention belongs to the technical field of fluorescent light-emitting materials, and relates to a fluorescent carbon dot, in particular to a fluorescent carbon dot with high light stability and thermal stability, and a preparation method of the fluorescent carbon dot. Background technique [0002] As a new type of solid-state lighting device, laser diode (LD) has high luminous efficiency, long visible light distance, fast response speed, and no "sudden drop in light efficiency". rising stars. [0003] LD to achieve white lighting, mainly includes two ways. One is to use lasers with different light-emitting colors to match and combine, and the light emitted by the lasers is combined to form white light. This method has a high color rendering index, but the design of the optical path is complicated, the cost of the equipment is high, and the light color is not easy to control, which limits its further development. The other is to use the combinat...

Claims

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Application Information

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IPC IPC(8): C09K11/65B82Y20/00B82Y40/00C01B32/15F21K9/64
CPCC09K11/65B82Y20/00B82Y40/00C01B32/15F21K9/64C01P2004/04C01P2004/32C01P2004/64C01P2002/72C01P2002/82Y02B20/00
Inventor 杨永珍何品一郑静霞刘旭光许并社
Owner TAIYUAN UNIV OF TECH
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