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Sunlight-excitable room-temperature phosphorescent carbon quantum dots, preparation method therefor and application of sunlight-excitable room-temperature phosphorescent carbon quantum dots

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

Active Publication Date: 2019-07-16
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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  • Sunlight-excitable room-temperature phosphorescent carbon quantum dots, preparation method therefor and application of sunlight-excitable room-temperature phosphorescent carbon quantum dots
  • Sunlight-excitable room-temperature phosphorescent carbon quantum dots, preparation method therefor and application of sunlight-excitable room-temperature phosphorescent carbon quantum dots
  • Sunlight-excitable room-temperature phosphorescent carbon quantum dots, preparation method therefor and application of sunlight-excitable room-temperature phosphorescent carbon quantum dots

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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 sunlight-excitable phosphorescent carbon quantum dots, a preparation method therefor and an application of the sunlight-excitable room-temperature phosphorescent carbon quantumdots. The preparation for the carbon quantum dots comprises the steps: 1) placing diethylene triamine pentacetic acid in a reaction vessel, adding secondary water, carrying out thorough stirring, andcarrying out ultrasonic treatment, so as to obtain a settled solution; 2) placing the settled solution containing reaction vessel in a baking oven, heating a temperature of the reaction vessel to 150DEG C to 200 DEG C, and carrying out a reaction for 3 to 8 hours, so as to obtain yellowish liquid; 3) taking out the reaction vessel, naturally cooling the reaction vessel, carrying out filtering toremove insolubles so as to obtain a clarified solution, and carrying out dialyzing treatment, so as to obtain an aqueous solution of the phosphorescent carbon quantum dots; and 4) subjecting the aqueous solution of the phosphorescent carbon quantum dots to freeze drying, thereby obtaining the target product. The phosphorescent carbon quantum dots disclosed by the invention are high in quantum yield and long in lives and are synthesized in one step without adding an additional matrix. The prepared carbon quantum dots can be excited by an ultraviolet light of 365 nm to generate phosphorescence,can also be excited by sunlight to generate phosphorescence and can be applied to the fields of anti-counterfeiting, information encryption and the like.

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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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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