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Pure carbon nanodots, preparation method thereof and LED light source

An LED light source, nano-dot technology, applied in nano-optics, nano-technology, nano-technology, etc., can solve the problems of quenching, non-uniform size of carbon nano-dots, etc., achieve low risk, good experimental repeatability, high luminous intensity Effect

Active Publication Date: 2018-09-28
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

[0007] In view of this, the object of the present invention is to provide a pure carbon nano-dot with high-efficiency luminescence and its preparation method and application in laser. The pure carbon nano-dot provided by the present invention can solve the problem of non-uniform size of carbon nano-dot And overcome the aggregation-induced fluorescence quenching in the aggregated state

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  • Pure carbon nanodots, preparation method thereof and LED light source
  • Pure carbon nanodots, preparation method thereof and LED light source
  • Pure carbon nanodots, preparation method thereof and LED light source

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preparation example Construction

[0032] The invention provides a preparation method of pure carbon nano dots, a pure carbon nano dot and an LED light source.

[0033] In a first aspect, the present invention provides a method for preparing pure carbon nano-dots, comprising the steps of: adding inorganic salts, polyhydroxy compounds and amino compounds to deionized water, dissolving, and heating in vacuum to obtain pure carbon nano-dots; The mass ratio of the inorganic salt polyol to the amino compound is 0.1-2:0.1-5:1.

[0034] In some specific embodiments, the preparation method includes the steps of: adding inorganic salts, polyhydroxy compounds and amino compounds into deionized water, after fully dissolving, drying, and then heating in vacuum to obtain pure carbon nano-dots.

[0035] In some specific embodiments, the mass ratio of the inorganic salt, polyol and amino compound is 0.5-1.5:0.5-3:1, more preferably 0.5-1.5:0.5:1.

[0036] In some specific embodiments, the inorganic salt is selected from one ...

Embodiment 1

[0046] Dissolve 0.5g of anhydrous calcium chloride powder, 0.5g of citric acid and 1g of urea in deionized water. After being fully dissolved, dry it under normal pressure, and then heat it at 250°C for one hour in a vacuum state to obtain carbon nano Click Product D1.

[0047] Such as Figure 1A It is a room light photograph of the carbon nano-dot product of Example 1 of the present invention, Figure 1B It is a fluorescent photo of the carbon nanodot product of Example 1 of the present invention, Figure 1C It is a TEM transmission photo of the carbon nanodot product of Example 1 of the present invention. from Figure 1A with Figure 1B It can be seen that the prepared carbon nanodot product D1 presents a puffed spherical shape and has bright yellow-green fluorescence. from Figure 1C It can be calculated that the prepared carbon nano-dots are spherical nanoparticles with a particle diameter of about 4 nm.

Embodiment 2

[0049] Dissolve 0.8g of anhydrous calcium chloride powder, 0.5g of citric acid and 1g of urea in deionized water. After being fully dissolved, dry it under normal pressure, and then heat it at 250°C for one hour in a vacuum state to obtain carbon nano point product, and dissolved it in deionized water to obtain carbon nano-dot product D2.

[0050] Figure 2A It is the ultraviolet-visible absorption spectrum when the carbon nanodot product D2 of Example 2 of the present invention is dissolved in deionized water, Figure 2B It is the fluorescence emission spectrum when the carbon nanodot product D2 of Example 2 of the present invention is dissolved in deionized water. from Figure 2A It can be seen that the ultraviolet absorption peaks of the prepared carbon nanodots D2 are at 330 and 406 nm. from Figure 2B It can be seen that the fluorescence emission peak of the carbon nanodot aqueous solution is at 520nm, which has green fluorescence.

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Abstract

The invention discloses pure carbon nanodots, a preparation method thereof and an LED light source. The preparation method of the pure carbon nanodots disclosed by the invention comprises the following steps: adding an inorganic salt, a polyhydroxy compound and an amino compound into deionized water, performing dissolving, and performing vacuum heating to obtain the pure carbon nanodots, wherein amass ratio of the inorganic salt to the polyhydroxy compound to the amino compound is (0.1-2):(0.1-5):1. The technical scheme disclosed by the invention has simple experimental operation, low risk and good experimental repeatability, and can be used for mass production; and meanwhile, the obtained carbon nanodots have high luminous intensity.

Description

technical field [0001] The invention relates to the technical field of carbon nano-dots, in particular to a pure carbon nano-dot with high-efficiency light emission, a preparation method thereof, and an LED light source. Background technique [0002] Carbon nanodots are a new type of fluorescent substance based on carbon materials, which have many advantages, such as low preparation cost, high fluorescence quantum efficiency, low biological toxicity, etc., and are applied in many fields, such as smart materials, photovoltaics and optoelectronics Devices, sensors, bioluminescent markers, etc., so it has gradually become a class of very promising materials. [0003] In the prior art, carbon nanodots can be prepared by various methods, such as laser ablation, electrochemical method, arc discharge method, pyrolysis method, ultrasonic and microwave method. However, the size of carbon nanodots prepared by these methods is difficult to achieve uniformity, and carbon nanodots with ...

Claims

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Application Information

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IPC IPC(8): C09K11/65B82Y20/00B82Y40/00H01L33/50
CPCB82Y20/00B82Y40/00C09K11/65H01L33/502
Inventor 周鼎曲松楠
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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