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Preparation method and application of room-temperature phosphorescent carbon-based composite material capable of changing color under single excitation source

A carbon-based composite material and room temperature phosphorescence technology, which is applied in the direction of luminescent materials, applications, chemical instruments and methods, etc., can solve the problems of complex preparation or purification, limited application, high price, etc.

Active Publication Date: 2021-06-25
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is expensive, has certain biological toxicity, and is complicated to prepare or purify
More importantly, almost all of them are functionalized based on the intensity of a single emission peak decaying with time, which limits its application in high-density information storage and advanced multi-dimensional anti-counterfeiting

Method used

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  • Preparation method and application of room-temperature phosphorescent carbon-based composite material capable of changing color under single excitation source
  • Preparation method and application of room-temperature phosphorescent carbon-based composite material capable of changing color under single excitation source
  • Preparation method and application of room-temperature phosphorescent carbon-based composite material capable of changing color under single excitation source

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049]Weigh 0.2522g of melamine and 0.4802g of cystine into 15mL of water, stir for 10min, transfer the mixture to a 25mL reactor, seal it, put it in an oven, set the temperature at 180°C for 4h. After the reaction, it was naturally cooled to room temperature, centrifuged at 10000r / min at high speed, and the obtained clear liquid was refrigerated at 4°C for 12 hours, then centrifuged at 10000r / min at high speed, dialyzed with a dialysis bag (3500D), and freeze-dried at -55°C, the obtained powder was Yellow fluorescent emitting carbon quantum dots. Then weigh 0.0450g of the above-mentioned carbon quantum dots and disperse them in 30mL of water, add 0.3000g of melamine, heat up to 100°C and reflux for 2 hours to carry out self-assembly, naturally cool down after the reaction, massive crystals are precipitated, washed with water, filtered, and vacuum-dried at 50°C, the obtained That is, the target carbon-based compound with a yield of 75.3%. Excited by a 365nm ultraviolet light ...

Embodiment 2

[0052] Weigh 0.2522g of melamine and 0.4802g of cystine into 15mL of water, stir for 10min, transfer the mixture to a 25mL reactor, seal it, put it in an oven, set the temperature at 180°C for 4h. After the reaction, it was naturally cooled to room temperature, centrifuged at 10000r / min at high speed, and the obtained clear liquid was refrigerated at 4°C for 12 hours, then centrifuged at 10000r / min at high speed, dialyzed with a dialysis bag (3500D), and freeze-dried at -55°C, the obtained powder was Yellow fluorescent emitting carbon quantum dots. Then weigh 0.0450g of the above-mentioned carbon quantum dots and disperse them in 30mL of water, add 0.4500g of isophthalic acid, heat up to 120°C and reflux for 2h to carry out self-assembly, naturally cool down after the reaction, needle-shaped crystals precipitate, wash with water, filter, vacuum at 50°C After drying, the target carbon-based composite was obtained with a yield of 90.7%. Excited by a 365nm ultraviolet lamp and t...

Embodiment 3

[0055] Weigh 0.2522g of melamine and 0.4802g of cystine into 15mL of water, stir for 10min, transfer the mixture to a 25mL reactor, seal it, put it in an oven, set the temperature at 180°C for 4h. After the reaction, it was naturally cooled to room temperature, centrifuged at 10000r / min at high speed, and the obtained clear liquid was refrigerated at 4°C for 12 hours, then centrifuged at 10000r / min at high speed, dialyzed with a dialysis bag (3500D), and freeze-dried at -55°C, the obtained powder was Yellow fluorescent emitting carbon quantum dots. Then weigh 0.0450g of the above-mentioned carbon quantum dots and disperse them in 30mL of water, add 0.4500g of phthalic acid, heat up to 120°C and reflux for 2h to carry out self-assembly, naturally cool down after the reaction, needle-shaped crystals precipitate, wash with water, filter, vacuum at 50°C After drying, the target carbon-based composite was obtained with a yield of 89.8%. Such as Image 6 After being excited by a 3...

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Abstract

The invention discloses a preparation method of a room-temperature phosphorescent carbon-based composite material capable of changing color under a single excitation source. The carbon-based composite material with the room-temperature phosphorescent property capable of changing color under the single excitation source is obtained by utilizing a hydrogen-bond interaction co-crystallization composite strategy of carbon quantum dots and common room-temperature induced aromatic compounds, and the yield is 75.3%-90.7%. The material effectively overcomes the condition limitation that the existing color-changing room-temperature phosphorescent material needs to be under the combined action of different excitation sources or blending of a plurality of compounds, and realizes color-changing room-temperature phosphorescence of the carbon-based composite material in the range of orange-yellow-yellow-green-green visible to naked eyes under a single excitation source, and the service life is 91 ms-582 ms. The preparation route is green, environment-friendly, economical and convenient, the phosphorescence color change range and the service life are adjustable, and the material has wide application prospects in the fields of advanced anti-counterfeiting and digital encryption.

Description

technical field [0001] The invention belongs to the field of material preparation and luminescent materials, and in particular relates to a preparation method and application of a carbon-based composite material capable of realizing color-changing room temperature phosphorescence under a single excitation source. Background technique [0002] Long-life room temperature phosphorescent materials are a kind of light-storing luminescent materials, which can slowly emit long-life phosphorescence visible to the naked eye after the light source is stopped, and are widely used in information security, digital encryption, life sciences, and optoelectronic devices. The long-lived room-temperature phosphorescent materials reported so far mainly include sulfide-doped lanthanides, oxides doped with heavy metal ions, or heterocyclic conjugated organic compounds with heteroatoms. It is expensive, has certain biological toxicity, and is complicated to prepare or purify. More importantly, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00C09D11/50
CPCC09K11/65B82Y20/00B82Y40/00C09D11/50
Inventor 瞿建张鑫陈新龙衡祥俊唐志远丁华俊
Owner YANCHENG INST OF TECH
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