Fluorescent carbon quantum dot, its light-emitting polymer based composite material and preparation method

A technology of light-emitting polymers and carbon quantum dots, which is applied in the direction of light-emitting materials, chemical instruments and methods, etc., can solve the problems of limited CDs application, low output, complicated preparation process and difficult realization, etc. simple effect

Active Publication Date: 2013-11-06
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since CDs were first reported in 2004, methods for preparing CDs have emerged, such as laser ablation, pyrolysis, combustion, hydrothermal, template, electrochemical erosion, ultrasonic and microwave-assisted methods, etc. There are many ways to prepare CDs, but they all have different defects, such as the preparation of the product needs to go through a complicated separation process, low yield, complex preparation process and difficult to achieve industrialization, etc., more importantly, the carbon quantum dots prepared by most of the current methods Severe fluorescence quenching occurs in the dry state, which limits the application of CDs in solid-state devices

Method used

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  • Fluorescent carbon quantum dot, its light-emitting polymer based composite material and preparation method
  • Fluorescent carbon quantum dot, its light-emitting polymer based composite material and preparation method
  • Fluorescent carbon quantum dot, its light-emitting polymer based composite material and preparation method

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Embodiment 1

[0034] (1) 0.528g (3mmol) L-ascorbic acid dissolved in 60ml of ethanol and water mixed solution (volume ratio, ethanol: water = 1:1), add 7.92g (30mmol) N-(β-aminoethyl)-γ -Aminopropyltriethoxysilane (KH791), then reacted in an oil bath at 95°C under magnetic stirring for 24 hours, and cooled naturally to room temperature to obtain a mixed solution of fluorescent carbon quantum dots and silicone prepolymers, and the quantum of the purified product The efficiency is 13.5% (Table 1), and its fluorescence spectrum and UV-vis absorption are as follows figure 1 , transmission electron microscope pictures as figure 2 , its digital photos under visible light and 365nm ultraviolet light are as follows Figure 5 a, 5b, the digital photos of it dried on filter paper under visible light and 365nm ultraviolet light are as follows Figure 5 g, 5h.

[0035] (2) The product obtained in (1) was spin-evaporated at 50°C to remove the solvent, then spin-coated on a quartz plate, and cured in...

Embodiment 2

[0037] (1) 1.584g (9mmol) L-ascorbic acid dissolved in 60ml of ethanol and water mixed solution (volume ratio, ethanol: water = 1:0.8), add 2.124g (9mmol) γ-glycidyl ether oxypropyl trimethoxy Silane (KH560), then reacted in an oil bath at 80°C under magnetic stirring for 12 hours, and cooled naturally to room temperature to obtain a mixed solution of fluorescent carbon quantum dots and organosilicon prepolymer. The quantum efficiency of the purified product was 12.7% (Table 1) .

[0038] (2) The product obtained in (1) was spin-evaporated at 50°C to remove the solvent, then spin-coated on a quartz plate, and cured in an oven at 100°C for 5 hours to obtain a light-emitting polymer-based composite material.

Embodiment 3

[0040] (1) 5.28g (30mmol) L-ascorbic acid dissolved in 60ml of ethanol and water mixed solution (volume ratio, ethanol: water = 1:0.5), add 3.39g (15mmol) N-(β-aminoethyl)-γ -Aminopropyltrimethoxysilane (KH792), then reacted in an oil bath at 90°C under magnetic stirring for 5 hours, and cooled naturally to room temperature to obtain a mixed solution of fluorescent carbon quantum dots and silicone prepolymer, and the quantum efficiency of the purified product was 10.3% (Table 1).

[0041] (2) The product obtained in (1) was spin-evaporated at 50°C to remove the solvent, then spin-coated on a quartz plate, and cured in an oven at 80°C for 48 hours to obtain a light-emitting polymer-based composite material.

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Abstract

The invention discloses a fluorescent carbon quantum dot, its light-emitting polymer based composite material and a preparation method thereof. More specifically, the invention provides a method for preparation of the fluorescent carbon quantum dot and its light-emitting polymer based composite material by taking a small molecule compound as a carbon source and an organosilicone monomer as a catalyst and stabilizer. By means of the combined action of the polymerizable organosilicone monomer and the small molecule carbon source, the carbon quantum dot can be formed in one step. Without purification, the reaction product only needs solvent removal to undergo further reaction so as to form a carbon quantum dot-organosilicone resin composite material. The organosilicone monomer involved in the invention can promote formation of the carbon quantum dot, and can play a role of stabilizing the carbon quantum dot, and also can be used as a polymer matrix monomer. Therefore, the obtained carbon quantum dot has stable luminescent properties, is well compatible with the polymer matrix and keeps the original luminescent properties. The method disclosed in the invention has a simple process and is easy to implement, and can be widely applied in the fields of solar cells and LED devices.

Description

technical field [0001] The invention relates to the field of functional polymer composite materials, in particular to a fluorescent carbon quantum dot and its light-emitting polymer-based composite material and a preparation method. Background technique [0002] Fluorescent carbon quantum dots (CDs) are another important class of nanocarbon materials after carbon nanotubes, nanodiamonds, fullerenes and graphene. Quantum dots have excellent optical and electrical properties. Compared with traditional semiconductor quantum dots , CDs have the advantages of low toxicity, low cost, good photostability, and good biocompatibility, so CDs have a wide range of applications in the fields of bioimaging, biosensing and probes, photocatalysis, fluorescent inks, LED devices, and solar cells. application prospects. Since CDs were first reported in 2004, methods for preparing CDs have emerged, such as laser ablation, pyrolysis, combustion, hydrothermal, template, electrochemical erosion, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65C09K11/06C08L83/08C08L83/06C08K3/04
Inventor 黄佳佳容敏智章明秋
Owner SUN YAT SEN UNIV
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