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Light-adjustable room-temperature phosphorescent carbon dot material, preparation method and applications thereof

A room temperature phosphorescence and carbon dot technology, which is applied in luminescent materials, fluorescence/phosphorescence, material analysis by optical means, etc., can solve the problems of cumbersome experimental steps, lack of phosphorescence carbon dots, and single material form, and achieves simple operation steps, The effect of universality and long phosphorescence lifetime

Active Publication Date: 2020-04-03
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have some shortcomings that need to be solved urgently: 1) The experimental steps are cumbersome, the cycle is long, and it is difficult to prepare in large quantities; 2) The properties of carbon dots greatly depend on the choice of solid matrix, and the material morphology is relatively single and difficult to control, mostly in the form of thin films Or massive, and the particle size is larger; 3) The color of phosphorescent carbon dots is mostly blue or green, lacking long-wavelength emitting phosphorescent carbon dots

Method used

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  • Light-adjustable room-temperature phosphorescent carbon dot material, preparation method and applications thereof
  • Light-adjustable room-temperature phosphorescent carbon dot material, preparation method and applications thereof
  • Light-adjustable room-temperature phosphorescent carbon dot material, preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Weigh 7.5g of potassium nitrate and 2.5g of sodium chloride powder (melting temperature is 350 ℃) into a sample bottle, add distilled water, stir well, then vacuum freeze-dry, and grind to obtain a uniform mixed salt system. Weigh 0.5 g of 1,2,4-triaminobenzene, grind it and the mixed salt system, place it in a crucible, heat it up to 350 °C at a heating rate of 10 °C in a muffle furnace, and heat it at 350 °C. Incubate for 3 hours, and then cool down to room temperature to obtain carbon dots with room temperature phosphorescence.

[0044] The scanning electron microscope image of the obtained powder is as follows figure 1As shown, the obtained material is oval or rod-shaped, and the size is about 50 nm. The powder was dispersed in acetone and tested by transmission electron microscopy and the results were as follows figure 2 , indicating that the carbon quantum dots with a diameter of about 2-3 nm are dispersed in a molten salt matrix of about 50 nm, indicating that...

Embodiment 2

[0048] Weigh 7.5g of potassium nitrate and 2.5g of sodium chloride powder (melting temperature is 350 ℃) into a sample bottle, add distilled water, stir well, then vacuum freeze-dry, and grind to obtain a uniform mixed salt system. Weigh 0.5g of citric acid, grind it with the mixed salt system, place it in a crucible, and keep it in a muffle furnace at a heating rate of 10°C at 350°C for 3 hours. When the temperature is cooled to room temperature, it has a Room-temperature phosphorescent carbon-based nanomaterials. The result is as Figure 8 As shown, the as-prepared material has an optimum emission at 477 nm for fluorescence and at 557 nm for phosphorescence (at an optimum excitation wavelength of 400 nm). The powder is white under a fluorescent lamp. Under a 395nm UV lamp, the obtained powder exhibits green fluorescence. When the UV lamp is turned off, the phosphorescence of the powder changes from green to yellow.

Embodiment 3

[0050] Weigh 7.5g of potassium nitrate and 2.5g of sodium chloride powder (melting temperature is 350 ℃) into a sample bottle, add distilled water, stir well, then vacuum freeze-dry, and grind to obtain a uniform mixed salt system. Weigh 0.5g of ethylenediaminetetraacetic acid, grind it and the mixed salt system, place it in a crucible, and keep it in a muffle furnace at a heating rate of 10°C at 350°C for 3 hours. When the temperature is cooled to room temperature, That is, carbon-based nanomaterials with room temperature phosphorescence are obtained. The result is as Figure 9 As shown, the as-prepared material has an optimum emission of fluorescence at 432 nm and an optimum emission of phosphorescence at 516 nm (at an optimum excitation wavelength of 365 nm). The powder is white under a fluorescent lamp. Under a 365nm UV lamp, the obtained powder exhibits blue fluorescence. When the UV lamp is turned off, the phosphorescence of the powder changes from green to yellow.

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Abstract

The invention discloses a light-adjustable room-temperature phosphorescent carbon dot material, a preparation method and applications thereof, and belongs to the technical field of preparation of luminescent carbon nanometer materials. The method comprises the following steps: weighing different inorganic salt powder, putting into a sample bottle, adding distilled water, fully stirring, drying, and grinding to obtain a uniform mixed salt system; and grinding a carbon source and the mixed salt system, putting the grinded materials into a crucible, carrying out heat preservation at 140-400 DEG Cfor 2-6 hours at a heating rate of 8-12 DEG C, and cooling to room temperature to obtain the carbon-based nanometer material with room-temperature phosphorescence. According to the invention, the method effectively solves the problems of complex preparation method, expensive raw materials, high toxicity and short-wavelength phosphorescence emission of the existing phosphorescent material, and canbe used for simply preparing a large batch of room-temperature phosphorescent materials with light adjustability.

Description

technical field [0001] The invention belongs to the field of manufacturing functional luminescent carbon materials, relates to a light-tunable room temperature phosphorescent carbon dot material, a preparation method and application thereof, and in particular relates to a simple and green molten salt method for preparing long-life light-tunable light-emitting diodes. Room temperature phosphorescent carbon dot materials and their applications in various fields. Background technique [0002] Phosphorescence, as a delayed luminescence form, has the characteristics of long triplet excited state lifetime and large Sktos shift, which makes the analysis method based on phosphorescence effectively eliminate the interference from the fluorescence and background scattered light of cells in vivo and reduce excitation. The coincidence of the emission spectrum and the self-absorption phenomenon, thereby improving the accuracy and sensitivity of target detection. However, phosphorescence...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00C09D11/50B42D25/36B42D25/378G01N21/64
CPCB82Y20/00B82Y40/00B42D25/36B42D25/378C09D11/50C09K11/65G01N21/6428
Inventor 王婵宋启军陈月月徐雅兰
Owner JIANGNAN UNIV
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