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Benzoquinone-based carbon dots/vinylpyrrolidone polymer rewritable room temperature phosphorescent composite material and its preparation method and application

A technology of vinylpyrrolidone and benzoquinone-based carbon dots is applied in the field of composite materials and organic room temperature phosphorescence materials, which can solve the problems of rewritable room temperature phosphorescence, which have not been reported, synthesis methods/cost limitations, etc. The effect of imprinting resolution

Active Publication Date: 2021-06-08
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, there are very few successful cases of pure organic rewritable room temperature phosphorescent materials, and due to the dependence on small molecule organic dyes, the regulation of their performance is often limited by the synthesis method / cost
Carbon-dot-based room-temperature phosphorescent materials mostly have the advantages of low cost and adjustable performance, but so far, the rewritable room-temperature phosphorescence of carbon-dot-based composites has not been reported.

Method used

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  • Benzoquinone-based carbon dots/vinylpyrrolidone polymer rewritable room temperature phosphorescent composite material and its preparation method and application
  • Benzoquinone-based carbon dots/vinylpyrrolidone polymer rewritable room temperature phosphorescent composite material and its preparation method and application
  • Benzoquinone-based carbon dots/vinylpyrrolidone polymer rewritable room temperature phosphorescent composite material and its preparation method and application

Examples

Experimental program
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Embodiment 1

[0041] figure 1 Schematic diagram of the design and synthesis of benzoquinone-based carbon dots / vinylpyrrolidone-based polymer rewritable room-temperature phosphorescent composites, according to figure 1 Prepare the composite material. Weigh 2mmol of p-benzoquinone (216mg) and dissolve in 100mL of absolute ethanol to obtain a 20mM ethanol solution of p-benzoquinone, and add 4mmol of ethylenediamine (240mg, 1:4) to the above solution while stirring until uniformly dispersed. The mixed solution was transferred to a 200mL hydrothermal reaction kettle, sealed, heated at 120°C for 10h, and cooled to room temperature naturally. The product was collected by filtration and rotary evaporation to remove the solvent, and purified by silica gel column chromatography (eluent: 10% methanol / ethyl acetate mixed solvent) to obtain carbon point 1. The TEM (transmission electron microscope) morphology of carbon dot 1 is shown in figure 2 : The average particle size of carbon dots 1 is 6.4nm,...

Embodiment 2

[0047] Carbon dots 1 were prepared as described in Example 1. Weigh 5 mg of carbon dot 1 and 995 mg of polyvinylpyrrolidone with an average molecular weight of 360,000, and dissolve the two in 19 mL of deionized water under stirring to obtain a solution 1 with a solid content of 5%. On a 6cm round Petri dish mold, use a blast oven to heat at 40°C for 10h to remove most of the solvent, then transfer to a 130°C vacuum oven to dry under vacuum for 1h, and use a PET film with a thickness of 80μm to obtain material 2.

Embodiment 3

[0049] Carbon dots 1 were prepared as described in Example 1. Weigh 5 mg of carbon dot 1 and 995 mg of polyvinylpyrrolidone with an average molecular weight of 58,000, and dissolve the two in 19 mL of deionized water under stirring to obtain a solution 1 with a solid content of 5%. Measure 8 mL of the solution and drop-coat it on On a 6cm round Petri dish mold, use a forced air oven to heat at 40°C for 10h to remove most of the solvent, then transfer to a 130°C vacuum oven to dry under vacuum for 1h, and use a PET film with a thickness of 80μm to plastic seal the material 3.

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Abstract

The invention discloses a benzoquinone-based carbon dot / vinylpyrrolidone polymer rewritable room temperature phosphorescent composite material and its preparation and application, belonging to the technical field of composite materials and organic room temperature phosphorescent materials. Using p-benzoquinone derivatives and organic polyamines as raw materials, benzoquinone-based carbon dots prepared by solvothermal method are blended with vinylpyrrolidone polymers to prepare rewritable room-temperature phosphorescent composite materials; and apply them to optical Engraved pattern anti-counterfeiting aspects. The present invention regulates the storage time of phosphorescent patterns at room temperature in materials by adjusting the molecular weight of the substrate and / or sealing processing conditions; the present invention can realize the regulation of rewritable phosphorescent storage time by adjusting the carbon dot raw materials, substrate and sealing processing conditions to meet various customized application requirements.

Description

technical field [0001] The invention belongs to the technical field of composite materials and organic room-temperature phosphorescent materials, and in particular relates to a rewritable room-temperature phosphorescent composite material based on quinone-based carbon dots / vinylpyrrolidone polymers and its preparation method and application. Background technique [0002] Phosphorescence is the phenomenon that after the luminescent molecules are excited to form a singlet excited state, they form a triplet excited state through intersystem crossing and further pass through the forbidden (T 1 →S 0 ) photophysical phenomenon of transition luminescence. Phosphorescence has a longer luminescence lifetime (μs~h) compared to short-lived fluorescence (~ns) due to the forbidden transition from the triplet excited state to the ground state. On the other hand, due to the long lifetime of the triplet excited state, which is easily quenched by non-radiative loss, generally lower tempera...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08L39/06C08K3/04C09K11/65C09K11/02
CPCC08J5/18C08J2339/06C08J2439/06C08K3/04C09K11/02C09K11/65
Inventor 袭锴刘彦峰苟慧琳孙瑞峰张敏肖昕晨张立佳
Owner NANJING UNIV
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