Carbon quantum dots with room-temperature phosphorescence and delayed fluorescence properties, and synthesis and application thereof

A technology of carbon quantum dots and delayed fluorescence, which is applied to carbon-containing luminescent materials and their synthesis and application fields. It can solve the problems of environmental protection, cumbersome preparation steps, and high price, so as to reduce non-radiative transitions and increase transition probability. , high yield effect

Active Publication Date: 2015-12-30
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology allows for the production of very small particles called CQs (Cold Quantum Dot) at an extremely fast rate while also giving them their unique property - they emit light when stimulated or interacted with another substance. These tiny objects make up different types of molecules such as organic chemicals like ammonia nitrogen oxides NOx). They help reduce air pollution caused by these emissions.

Problems solved by technology

This patented technical problem addressed by this patents relates to improving the efficiency of producing high brightness light emitting diodes (LED), specifically those made from carbon quantum dot material(CQD). Current methods involve synthesis processes involving multiple chemical reactions, leading to waste products and increased costs associated with manufacturing these devices. Additionally, current techniques require specific starting materials like selenium, tellurium, sulfur, lead, copper, silver, gold, zinc oxide, manganese nitrogen, magnesia, ceramics, glassy carbons, polymers, rubber, resins, siloxanes, epoxy resin systems, polyimides, polysilane films, plasticizers, solvents, lubricants, adhesives, coatings, wires, sensors, optic fibers, electronic components, batteries, solar cells, photovoltaics, fuel cell eletrodes, catalyst supports, energy storage carriers, electron transport layers, and other applications related to carbon quantum point chemistry.

Method used

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  • Carbon quantum dots with room-temperature phosphorescence and delayed fluorescence properties, and synthesis and application thereof
  • Carbon quantum dots with room-temperature phosphorescence and delayed fluorescence properties, and synthesis and application thereof
  • Carbon quantum dots with room-temperature phosphorescence and delayed fluorescence properties, and synthesis and application thereof

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 at 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, react at 1000W, 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 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 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

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Claims

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Application Information

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Owner BEIJING UNIV OF CHEM TECH
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