Phosphorescent material based on graphene quantum dot and preparation method thereof
A technology of graphene quantum dots and phosphorescent materials, applied in luminescent materials, nanotechnology for materials and surface science, chemical instruments and methods, etc., can solve the problems of low phosphorescent quantum yield and short life of quantum dots, and achieve The effect of high quantum yield, simple preparation method and low energy consumption
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[0033] Embodiments of the present invention provide in a second aspect the preparation method of the phosphorescent material based on graphene quantum dots provided by the embodiments of the present invention in the first aspect, comprising the following steps:
[0034] 1) adding the phosphorus-containing precursor and the selenium-containing precursor into the solvent respectively and stirring to completely dissolve them to obtain the first mixed solution;
[0035] 2) performing a hydrothermal reaction on the first mixed solution, and obtaining a second mixed solution after the hydrothermal reaction is completed;
[0036] 3) Purifying and drying the second mixed solution to obtain a phosphorescent material based on graphene quantum dots.
[0037] The embodiment of the present invention adopts the hydrothermal synthesis method to prepare the phosphorescent material based on graphene quantum dots, which not only has a high quantum yield, but also has a simple preparation method...
Embodiment 1
[0061] A method for preparing a phosphorescent material based on graphene quantum dots, comprising the steps of:
[0062] Step 1: Add 0.18g of hexamethylphosphoric triamide and 0.2g of L-selenomethionine into 10mL of deionized water respectively, and then ultrasonically treat them to completely dissolve them to obtain the first mixed solution; wherein, the time of ultrasonic treatment is 1000W, frequency 100kHz, ultrasonic treatment time 0.1h, temperature 30°C. The concentration of hexamethylphosphoric triamide was 1 mmol / mL, and the concentration of L-selenomethionine was 1.02 mmol / mL.
[0063] Step 2: Add the first mixed solution into a polytetrafluoroethylene-lined autoclave, then conduct a hydrothermal reaction at 200°C for 3 hours, and obtain the second mixed solution after the hydrothermal reaction is completed;
[0064] Step 3, dialyzing the third mixed solution in a porous alumina filter membrane, and then performing freeze-drying treatment to obtain a phosphorescent ...
Embodiment 2
[0071] A method for preparing a phosphorescent material based on graphene quantum dots, comprising the steps of:
[0072] Step 1: Add 0.26g of triphenylphosphine and 0.16g of phenylselenol into 10mL of deionized water respectively, and then ultrasonically treat them to completely dissolve them to obtain the first mixed solution; the time of ultrasonic treatment is 1500W, and the frequency is 100kHz , the ultrasonic treatment time is 0.5h, and the temperature is 30°C. Wherein, the concentration of triphenylphosphine is 1 mmol / mL, and the concentration of phenylselenol is 1 mmol / mL.
[0073] Step 2: Add the first mixed solution into a polytetrafluoroethylene-lined autoclave, then conduct a hydrothermal reaction at 150° C. for 5 hours, and obtain a second mixed solution after the hydrothermal reaction is completed;
[0074] Step 3, dialyzing the third mixed solution in a porous alumina filter membrane, and then performing freeze-drying treatment to obtain a phosphorescent materi...
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