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Carbon quantum dots with room temperature phosphorescence and delayed fluorescence properties and their synthesis and applications

A technology of carbon quantum dots and delayed fluorescence, which is applied to carbon-containing luminescent materials and their synthesis and application fields, can solve the problems of high price, cumbersome preparation steps, and non-compliance with environmental protection, and achieve high output, increase transition probability, and reduce Effects of nonradiative transitions

Active Publication Date: 2017-05-24
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the reported materials are inorganic or metal composites containing a certain amount of heavy metal atoms, which are highly toxic, expensive and have poor stability.
At present, although there are some reports of pure organic compounds with room temperature phosphorescence and delayed fluorescence, the preparation steps are cumbersome and highly toxic, which does not conform to the concept of green environmental protection.

Method used

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  • Carbon quantum dots with room temperature phosphorescence and delayed fluorescence properties and their synthesis and applications
  • Carbon quantum dots with room temperature phosphorescence and delayed fluorescence properties and their synthesis and applications
  • Carbon quantum dots with room temperature phosphorescence and delayed fluorescence properties and their synthesis and applications

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Weigh 8 g of isophorone diisocyanate (IPDI) into a polytetrafluoroethylene mold, place it in a microwave reactor (CEM company, MARS6) at a power of 700 W, and react at 250 ° C for 10 min, cool to obtain a gray solid, take it out and grind it into Powder; add 50ml of ethanol to dissolve to obtain a brown solution, remove insoluble matter by centrifugal filtration at 10000rmp for 30min; dialyze with a 3500Da dialysis bag for 48 hours. The dialyzed solution was dried in a vacuum oven at 60° C. to obtain pure carbon quantum powder (named IPDI-CD), and the yield was as high as 83%.

[0037] The carbon quantum dots obtained in this embodiment are detected, such as Figure 1~4 . figure 1 It is the infrared spectrum of IPDI-CD carbon quantum dots. It can be seen from the figure that at 1700cm -1 Strong peaks appear on the left and right, indicating that carbon quantum dots contain C=0; 3300, 1580cm -1 The stretching vibration peaks of N-H and C=N respectively indicate that t...

Embodiment 2

[0039] Weigh 5g of toluene diisocyanate (TDI) into a polytetrafluoroethylene mold, put it in a microwave reactor, react at 700W, 200°C for 10min, cool to obtain a dark gray solid, take it out and grind it into powder; add 50ml of ethanol to dissolve it to obtain Brown solution, 10000rmp, 30min centrifugal filtration to remove insoluble matter; dialysis with a 3500Da dialysis bag for 48 hours, the solution after dialysis was dried in a vacuum oven at 60°C to obtain pure fluorescent carbon quantum powder (named TDI-CD) . The carbon quantum dots are detected, and the TDI-CD has a uniform size, an average particle diameter of 4.3nm, and a yield of 80%.

Embodiment 3

[0041] Weigh 5g of hexamethylene diisocyanate (HDI) into a polytetrafluoroethylene mold, put it in a microwave reactor, and react at 1000W and 300°C for 30min, cool to obtain a dark gray solid, take it out and grind it into powder; add 50ml of ethanol to dissolve it to obtain Brown solution, 10000rmp, 30min centrifugation to remove insoluble matter; dialysis with 3500Da dialysis bag for 48 hours, the solution after dialysis was dried in a vacuum oven at 60°C to obtain pure fluorescent carbon quantum powder (named HDI-CD) . The detection of carbon quantum dots shows that the size of HDI-CD is uniform, the average particle size is 3.8nm, and the yield is ~83%.

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Abstract

The invention provides carbon quantum dots with room-temperature phosphorescence and delayed fluorescence properties. The carbon quantum dots can generate fluorescence under the excitation of ultraviolet light with the wavelength of 315-475nm, wherein the fluorescence intensity reaches the maximum when the excitation wavelength is 375nm. The particle size distribution range of the carbon quantum dots is 2-6nm. The brand-new carbon quantum dots with room-temperature phosphorescence and delayed fluorescence properties are synthesized from isocyanate under the action of microwaves. The carbon quantum dots have high yield, are oil-soluble, and can be compounded into a polymer material in situ without aggregation. The structure of the carbon quantum dots contains certain amounts of O, N and other heteroatoms with lone electron pairs, thereby increasing the transition probability from singlet state to triplet state under excitation. Meanwhile, the matrix performs the functions of reducing the nonradiative transition and quenching the triplet-state oxygen, so that the prepared carbon quantum dots have the visible stable room-temperature phosphorescence and delayed fluorescence properties in the matrix.

Description

technical field [0001] The invention belongs to the field of luminescent materials, and in particular relates to a carbon-containing luminescent material and its synthesis and application. Background technique [0002] Carbon is the basis of all known life on earth, and has played a pivotal role in the development of human history and the progress of modern science and technology. With the development of nanocarbon materials such as C60, carbon nanotubes and graphene, carbon quantum dots have become a research hotspot in the past two years. Compared with the previous honeycomb structure nano-carbon, carbon quantum dots have superior luminescence properties; compared with semiconductor quantum dots, the luminescence is more stable, easy to functionalize and industrialize, non-toxic, simple and cheap to prepare, and is expected to give luminescent materials, optoelectronics Therefore, it is of great theoretical significance and application background to carry out basic resear...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65G09F3/02
Inventor 岳冬梅谈静张立群李旺张洁
Owner BEIJING UNIV OF CHEM TECH
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