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A kind of sunlight excitable room temperature phosphorescent carbon quantum dot and its preparation method and application

A technology of carbon quantum dots and phosphorescence, applied in the field of phosphorescent carbon quantum dots, to achieve the effects of stable optical properties, wide source of raw materials, and high quantum yield

Active Publication Date: 2021-07-02
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, carbon quantum dots have good fluorescence properties, but room temperature phosphorescence of carbon quantum dots has rarely been reported.

Method used

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  • A kind of sunlight excitable room temperature phosphorescent carbon quantum dot and its preparation method and application
  • A kind of sunlight excitable room temperature phosphorescent carbon quantum dot and its preparation method and application
  • A kind of sunlight excitable room temperature phosphorescent carbon quantum dot and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0027] Step 1, weigh 0.8g of diethylenetriaminepentaacetic acid and place it in a reaction kettle, then add 30mL of secondary aqueous solution, stir well, and obtain a clear solution by ultrasonication;

[0028] Step 2, place the reaction kettle with the clear solution in an oven, heat at 180°C for 5 hours, and obtain a light yellow liquid;

[0029] Step 3, take out the reaction kettle, cool it down naturally, filter out the insoluble matter to obtain a clear solution, pass through a dialysis bag of 500-1000Da, dialyze in a glass container for 2 days, change the water every 4 hours, and obtain phosphorescent carbon quantum after dialysis point water solution;

[0030] Step 4, after freeze-drying the aqueous solution of carbon quantum dots to obtain phosphorescent carbon quantum dots, the absolute quantum yield is 52%;

Embodiment 2

[0032] Step 1, weigh 0.7g of diethylenetriaminepentaacetic acid and place it in a reaction kettle, then add 30mL of secondary aqueous solution, stir well, and obtain a clear solution by ultrasonication;

[0033] Step 2, place the reaction kettle with the clear solution in an oven, heat at 180°C for 5 hours, and obtain a light yellow liquid;

[0034] Step 3, take out the reaction kettle, cool it down naturally, filter out the insoluble matter to obtain a clear solution, pass through a dialysis bag of 500-1000Da, dialyze in a glass container for 2 days, change the water every 4 hours, and obtain phosphorescent carbon quantum after dialysis point water solution;

[0035] Step 4, freeze-drying the aqueous solution of carbon quantum dots to obtain phosphorescent carbon quantum dots with an absolute quantum yield of 34%.

Embodiment 3

[0037] Step 1, weigh 0.9g of diethylenetriaminepentaacetic acid and place it in a reaction kettle, then add 30mL of secondary aqueous solution, stir well, and obtain a clear solution by ultrasonication;

[0038] Step 2, place the reaction kettle with the clear solution in an oven, heat at 180°C for 5 hours, and obtain a light yellow liquid;

[0039] Step 3, take out the reaction kettle, cool it down naturally, filter out the insoluble matter to obtain a clear solution, pass through a dialysis bag of 500-1000Da, dialyze in a glass container for 2 days, change the water every 4 hours, and obtain phosphorescent carbon quantum after dialysis point water solution;

[0040] Step 4, freeze-drying the aqueous solution of carbon quantum dots to obtain phosphorescent carbon quantum dots with an absolute quantum yield of 47%.

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Abstract

The invention discloses a phosphorescent carbon quantum dot excitable by sunlight, a preparation method and application thereof. The preparation of the carbon quantum dots: 1) placing diethylenetriaminepentaacetic acid in a reaction kettle, adding secondary water, fully stirring, and ultrasonically obtaining a clear solution; 2) placing the reaction kettle with the clear solution in an oven, Heat at 150°C-200°C for 3-8h to obtain a light yellow liquid; 3) Take out the reaction kettle, cool naturally, filter to remove insoluble matter to obtain a clear solution, and obtain a phosphorescent carbon quantum dot aqueous solution through dialysis; 4) Phosphorescent carbon The target product was obtained after the quantum dot aqueous solution was freeze-dried. The phosphorescent carbon quantum dot of the present invention has high quantum yield and long service life, and only needs one step of synthesis without adding additional matrix. The prepared carbon quantum dots can not only be excited by 365nm ultraviolet lamps to generate phosphorescence, but also can be excited by sunlight to generate phosphorescence, which can be used in anti-counterfeiting, information encryption and other fields.

Description

technical field [0001] The present invention relates to phosphorescent carbon quantum dots, in particular to phosphorescent carbon quantum dots that can be excited by sunlight, specifically a method for preparing carbon quantum dots using diethylenetriaminepentaacetic acid as a raw material, and the prepared carbon quantum dots are useful in anti-counterfeiting, information Applications in encryption and other fields. Background technique [0002] Room temperature phosphorescence (RTP) has received more and more attention due to its high electroluminescent efficiency and long lifetime. Because of its excellent characteristics, it can be widely used in anti-counterfeiting, chemical sensors, photovoltaic electronic devices and so on. So far, RTP materials are mainly coordination complexes containing noble metals, which are not only expensive but also cause pollution to the environment and organisms, so the development of pure organic phosphorescent materials is necessary. Ho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65C01B32/15B82Y20/00B82Y40/00C09D11/50
CPCB82Y20/00B82Y40/00C09D11/50C09K11/65C01B32/15
Inventor 高艺芳张慧林焦媛路雯婧刘洋韩辉双少敏董川
Owner SHANXI UNIV
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