A long afterglow material and its preparation method and application

A technology of long afterglow materials and carbon dots, applied in luminescent materials, data processing applications, chemical instruments and methods, etc., can solve problems such as difficult to obtain RTP materials, and achieve the effects of low cost, wide application range, and simple operation

Active Publication Date: 2021-07-23
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, how to obtain RTP materials with longer lifetime, higher phosphorescence quantum efficiency, and better stability, and how to solve the technical problems that carbon dots without heteroatoms are difficult to obtain RTP materials, still need to be studied and solved.

Method used

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  • A long afterglow material and its preparation method and application
  • A long afterglow material and its preparation method and application
  • A long afterglow material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The preparation of metal-free RTP material CDs / BA composite material, the specific steps are as follows:

[0056] (1) Preparation of CDs: the preparation of a-CDs uses an organic acid system, specifically, the raw material is anhydrous citric acid, and the synthesis method is a solvothermal method. Roughly divided into the following two steps: First, weigh 1 g of anhydrous citric acid and dissolve it in 20 mL of distilled water, and transfer the obtained solution into a large beaker. Next, heat the large beaker at 180°C in a heating mantle until the solution turns brown. After it cools down to room temperature naturally, take out the sample for separation and purification, and finally obtain the desired a-CDs without heteroatoms, and store them in the refrigerator for later use. .

[0057] (2) Preparation of a-CDs / BA composite material: First, weigh 3 g of BA and transfer it to a beaker, dissolve it with 40 mL of deionized water, then add 1 mL of a-CDs with a concentra...

Embodiment 2

[0072] The preparation of the metal-free RTP material b-CDs / BA composite material, the specific steps are as follows:

[0073] (1) Preparation of CDs: The preparation of CDs uses an organic compound system. Specifically, polyvinyl alcohol is used as a raw material to synthesize CDs by a one-step hydrothermal method. water, and transfer the resulting solution to a reaction kettle. Secondly, put the reaction kettle in an oven at 200°C for 10 h, and wait for it to cool down to room temperature naturally. The reacted solution was separated and purified, and finally the desired b-CDs without heteroatoms were obtained and stored in a refrigerator for future use.

[0074] (2) Preparation of b-CDs / BA composite material: First, weigh 3 g of BA and transfer it to a beaker, dissolve it with 40 mL of deionized water, then add 1 mL of b-CDs with a concentration of 0.01 g / mL, and stir with a magnetic force Stir for 30 minutes to allow it to mix well. Wrap the beaker with foil to prevent ...

Embodiment 3

[0078] The preparation of metal-free RTP material c-CDs / BA composite material, the specific steps are as follows:

[0079] (1) Preparation of CDs: CDs were prepared using an organic sugar compound system. Specifically, glucose was used as a raw material to synthesize CDs by microwave method. The resulting solution was transferred to a glass vial. Secondly, put the glass bottle in a microwave oven at a certain power (for example, 800W) to react for 10 minutes, and wait for the glass bottle to cool down to room temperature naturally. The reacted solution was separated and purified, and finally the desired c-CDs without heteroatoms were obtained and stored in a refrigerator for future use.

[0080] (2) Preparation of c-CDs / BA composite material: First, weigh 3 g of BA and transfer it into a beaker, dissolve it with 40 mL of deionized water, then add 1 mL of c-CDs with a concentration of 0.01 g / mL, and stir with a magnetic force Stir for 30 minutes to allow it to mix well. Wrap...

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Abstract

The invention provides a long afterglow material and its preparation method and application. The long-lasting material is composed of carbon dots in the matrix, and is in a glassy state, and has the properties of fluorescence, delayed fluorescence and phosphorescence; the material has longer life, higher phosphorescence quantum efficiency, and better stability, and has been successfully fabricated from Heteroatom carbon dots have produced a metal-free afterglow material with a lifetime of up to 2682ms and a phosphorescent quantum efficiency of up to 17.5%. The present invention also provides a preparation method of the long afterglow material. The carbon dots and the matrix are subjected to one-step heat treatment to form a glassy state. The method has universal adaptability, and the obtained material has better phosphorescence effect, simple operation, low cost, It is green and environmentally friendly, has a wide range of applications, and can realize mass production. At the same time, the long afterglow material has achieved good results in the application of three-mode anti-counterfeiting technology and information encryption, and has broad application prospects in the field of optoelectronics, especially in the fields of anti-counterfeiting and information encryption technologies.

Description

technical field [0001] The invention belongs to the field of composite functional materials, in particular to a long afterglow material and its preparation method and application. Background technique [0002] Afterglow materials include chamber phosphorescence, persistent luminescence, and delayed fluorescence materials. Due to its long lifetime and broad Stokes transition, phosphorescence has attracted a wide range of applications in optoelectronics, photodynamic therapy, sensing, data recording, bioscience technology, and security systems. But so far, room-temperature phosphorescent (RTP) materials are generally inorganic or metal complexes, which usually contain toxic heavy metals, are expensive and unstable. Therefore, it is of great significance to research and develop low-cost, multi-purpose, excellent performance and environment-friendly metal-free RTP materials. [0003] Carbon dots (CDs) have become a current research hotspot for metal-free RTP materials due to t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/02C09K11/59C09K11/63C09K11/64G06Q30/00G06T1/00
CPCC09K11/025C09K11/59C09K11/63C09K11/64C09K11/644G06Q30/0185G06T1/0021
Inventor 刘应亮周婉庄健乐胡超凡雷炳富张浩然张学杰
Owner SOUTH CHINA AGRI UNIV
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