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Matrix-free phosphorescent carbon quantum dot as well as preparation method and application thereof

A carbon quantum dot, matrix-free technology, applied in the field of matrix-free phosphorescent carbon quantum dots, can solve the problems of increasing the cost of carbon quantum dots, cumbersome synthesis process, low quantum yield, etc., achieving great application value, wide range of raw material sources, quantum high yield effect

Inactive Publication Date: 2017-11-03
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are problems such as cumbersome synthesis process, low quantum yield, short luminescence time, and high toxicity, which increase the cost of carbon quantum dots and limit its application.

Method used

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  • Matrix-free phosphorescent carbon quantum dot as well as preparation method and application thereof
  • Matrix-free phosphorescent carbon quantum dot as well as preparation method and application thereof
  • Matrix-free phosphorescent carbon quantum dot as well as preparation method and application thereof

Examples

Experimental program
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Embodiment 1

[0028] Step 1, weigh 0.3250g aspartic acid and 0.1125g glucose respectively and place them in a beaker, then add 3mL sodium hydroxide (1M / L) solution water, stir well, and obtain a clear solution by ultrasonication;

[0029] Step 2, placing the beaker containing the clear solution in an oil bath, heating at 150°C for 5 minutes to obtain a light yellow solid;

[0030] Step 3, take out the beaker, cool naturally, add 10mL of secondary water to it; stir to dissolve the solid, and obtain an aqueous solution of carbon quantum dots;

[0031] Step 4, after freeze-drying the aqueous solution of carbon quantum dots to obtain phosphorescent carbon quantum dots, the absolute quantum yield is 35%;

[0032] The carbon quantum dot of the present embodiment is tested and applied, see Figure 1-6 .

[0033] Figure 6 Application of the carbon quantum dots prepared in Example 1 in information encryption and anti-counterfeiting. Take 0.5g of the phosphorescent carbon quantum dots obtained i...

Embodiment 2

[0035] Step 1, weigh 0.325g of aspartic acid and 0.225g of glucose respectively and place them in a beaker, then add 3mL of sodium hydroxide (1M / L) solution water, stir well, and obtain a clear solution by ultrasonication;

[0036] Step 2, placing the beaker containing the clear solution in an oil bath, heating at 150°C for 5 minutes to obtain a light yellow solid;

[0037] Step 3, take out the beaker, let it cool naturally, and add 10mL of secondary water to it;

[0038] Step 4, freeze-drying the aqueous solution of carbon quantum dots to obtain phosphorescent carbon quantum dots with an absolute quantum yield of 27%.

Embodiment 3

[0040] Step 1, weigh 0.325g aspartic acid and 0.45g glucose respectively and place them in a beaker, then add 3mL sodium hydroxide (1M / L) solution water, stir well, and obtain a clear solution by ultrasonication;

[0041] Step 2, placing the beaker containing the clear solution in an oil bath, heating at 150°C for 5 minutes to obtain a light yellow solid;

[0042] Step 3, take out the beaker, let it cool naturally, and add 10mL of secondary water to it;

[0043] Step 4, freeze-drying the aqueous solution of carbon quantum dots to obtain phosphorescent carbon quantum dots, the absolute quantum yield of which is 25%.

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Abstract

The invention discloses a matrix-free phosphorescent carbon quantum dot as well as a preparation method and application thereof. The preparation method comprises the following steps: using glucose and aspartic acid as raw materials, adding a sodium hydroxide aqueous solution and carrying out ultrasonic operation to obtain a clarified solution; heating the clarified solution in an oil bath at the temperature of 150 DEG C for 5 minutes to obtain the carbon dot with solid phosphorescent properties. The phosphorescent carbon quantum dot disclosed by the invention is high in yield and long in service life; in addition, the phosphorescent carbon quantum dot is synthesized by one step and no extra matrix is needed; the carbon quantum dot can be applied to the fields of counterfeiting, information encryption and the like.

Description

technical field [0001] The present invention relates to phosphorescent carbon quantum dots, in particular to matrix-free phosphorescent carbon quantum dots, specifically a method for preparing carbon quantum dots using glucose and aspartic acid as raw materials, and the prepared carbon quantum dots are used in anti-counterfeiting, information encryption, etc. field applications. Background technique [0002] Room temperature phosphorescence (RTP) has attracted 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. However, the preparation of pure organic ...

Claims

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Application Information

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IPC IPC(8): C09K11/65
CPCC09K11/65
Inventor 高艺芳韩辉路雯婧刘洋弓晓娟双少敏董川
Owner SHANXI UNIV
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