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Preparation method of adjustable solid-state fluorescent carbon dots

A technology of solid-state fluorescence and carbon dots, applied in chemical instruments and methods, nano optics, luminescent materials, etc., can solve the problems of complex synthesis process, increased synthesis cost, low photoluminescence quantum yield, etc., and achieve simple preparation method, The effect of convenient raw material supply and convenient purification

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

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Problems solved by technology

However, the photoluminescence quantum yield of such carbon dots is low, and the color of the light can only be adjusted from blue to green at most.
Another method is to use aggregation-induced emission to prepare fluorescent solid-state carbon dots, but this method is only applicable to a small number of molecules, and the synthesis process is complicated, which often increases the actual synthesis cost.

Method used

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  • Preparation method of adjustable solid-state fluorescent carbon dots
  • Preparation method of adjustable solid-state fluorescent carbon dots
  • Preparation method of adjustable solid-state fluorescent carbon dots

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Effect test

Embodiment 1

[0035] A method for preparing adjustable solid-state fluorescent carbon dots for LEDs, the steps of which are:

[0036] (1) Add 0.15 mmol of dithiosalicylic acid to 10 mL of saturated acetic acid aqueous solution (36 wt.%), and ultrasonically mix for 10 minutes;

[0037] (2) Transfer the sonicated solution into a 50mL and tetrafluoroethylene liner, react in the reactor at 180°C for 15h, cool down to room temperature naturally after the reaction, add deionized water into the reacted solution, and the solution becomes cloudy rapidly , the turbid solution was centrifuged at a speed of 6500 rad / min for 10 minutes, and the supernatant was removed to obtain a precipitate. Repeat this process 2-3 times to obtain purified carbon dots. The purified carbon dot precipitate mixed with a small amount of solution was frozen in a refrigerator at -20°C until the solution became solid, and the solid was placed in a freeze dryer for 24 hours to obtain dry carbon dot powder.

[0038] (3) Dispe...

Embodiment 2

[0040] (1) Add 0.5 mmol of dithiosalicylic acid to 10 mL of saturated aqueous acetic acid solution (36 wt.%), and ultrasonically mix for 10 minutes;

[0041] (2) Transfer the sonicated solution into a 50mL and tetrafluoroethylene liner, react in the reactor at 180°C for 15h, cool down to room temperature naturally after the reaction, add deionized water into the reacted solution, and the solution becomes cloudy rapidly , the turbid solution was centrifuged at a speed of 6500 rad / min for 10 minutes, and the supernatant was removed to obtain a precipitate. Repeat this process 2-3 times to obtain purified carbon dots. The purified carbon dot precipitate mixed with a small amount of solution was frozen in a refrigerator at -20°C until the solution became solid, and the solid was placed in a freeze dryer for 24 hours to obtain dry carbon dot powder.

[0042] (3) Disperse 0.2 g of the purified carbon dots in 3 mL of toluene solution mixed with 1 g of polystyrene, and stir at 60° C....

Embodiment 3

[0044] (1) Add 1 mmol of dithiosalicylic acid to 10 mL of saturated aqueous acetic acid solution (36 wt.%), and ultrasonically mix for 10 minutes;

[0045](2) Transfer the sonicated solution into a 50mL and tetrafluoroethylene liner, react in the reactor at 180°C for 15h, cool down to room temperature naturally after the reaction, add deionized water into the reacted solution, and the solution becomes cloudy rapidly , the turbid solution was centrifuged at a speed of 6500 rad / min for 10 minutes, and the supernatant was removed to obtain a precipitate. Repeat this process 2-3 times to obtain purified carbon dots. The purified carbon dot precipitate mixed with a small amount of solution was frozen in a refrigerator at -20°C until the solution became solid, and the solid was placed in a freeze dryer for 24 hours to obtain dry carbon dot powder.

[0046] (3) Disperse 0.2 g of the purified carbon dots in 3 mL of toluene solution mixed with 1 g of polystyrene, and stir at 60° C. fo...

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Abstract

The invention discloses a preparation method of an adjustable solid-state fluorescent carbon dot for an LED (light-emitting diode). The carbon dot is an anhydride-terminated carbon dot and has bright fluorescence in a solid state. The preparation method comprises the following steps: (1) preparing a carbon dot precursor solution: dispersing dithiosalicylic acid in a saturated acetic acid solution, and conducting ultrasonic dispersing uniformly; (2) preparing carbon dots: transferring the carbon dot precursor solution into a reaction kettle, conducting heating for reaction, conducting cooling to room temperature, conducting purifying, and conducting freeze-drying to obtain carbon dot powder; and (3) building an LED: fully mixing the carbon dot powder with polystyrene dissolved in toluene to obtain uniform mixed slurry, and coating an ultraviolet LED lamp bead with the mixed slurry, and conducting curing to obtain the carbon dot LED. The method disclosed by the invention is simple to operate and low in difficulty of an operation process, innovation is made on the basis of traditional carbon dot purification, the problem of fluorescence quenching of the carbon dots in a solid state is solved, and the carbon dots with good luminescence in the solid state are obtained.

Description

technical field [0001] The invention relates to a method for preparing a controllable solid-state fluorescent carbon point for LEDs, and belongs to the technology and application in the application field of fluorescent nanomaterials and photoelectric devices. Background technique [0002] As the core breakthrough of the fourth-generation light source in the 21st century, solid-state fluorescent materials are one of the current scientific research hotspots. Due to the shortcomings of commercial rare earth phosphors such as non-renewable, expensive, and low abundance of rare earths, it is urgent to develop alternative materials for rare earths. Carbon dots have the advantages of low cost, high efficiency, and large reserves, and are a potential alternative energy source. In recent years, great achievements have been made in the preparation of fluorescent carbon dots, but the preparation of luminescent solid-state carbon dots is still a great challenge due to the existence of ...

Claims

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Application Information

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IPC IPC(8): C09K11/65B82Y20/00B82Y40/00H01L33/50
CPCC09K11/65B82Y20/00B82Y40/00H01L33/504
Inventor 王春雷刘樊徐淑宏王著元崔一平
Owner SOUTHEAST UNIV
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