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Room-temperature phosphorescent material based on carbon dots in composite matrix as well as preparation method and application of room-temperature phosphorescent material

A composite matrix, room temperature phosphorescence technology, applied in the direction of luminescent materials, nanotechnology for materials and surface science, chemical instruments and methods, etc., can solve the problem that carbon dot composite materials have less phosphorescence, and achieve great application value, method The effect of simplicity and mild reaction conditions

Pending Publication Date: 2021-03-26
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a room-temperature phosphorescent material based on carbon dots in a composite matrix and its preparation method and application for the problem that the existing carbon dot composite materials rarely have phosphorescence.

Method used

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  • Room-temperature phosphorescent material based on carbon dots in composite matrix as well as preparation method and application of room-temperature phosphorescent material
  • Room-temperature phosphorescent material based on carbon dots in composite matrix as well as preparation method and application of room-temperature phosphorescent material

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Embodiment 1

[0038] This embodiment provides a method for preparing a room temperature phosphorescent material, which includes the following steps:

[0039] (1) Dissolve 3mL of acrylic acid and 3mL of ethylenediamine in 30mL of distilled water and stir thoroughly to obtain a mixed solution;

[0040] (2) Place the mixed solution obtained in step (1) in a 100mL Erlenmeyer flask, and heat it at 750W in a microwave oven for 7 minutes to obtain a brownish-yellow solid;

[0041] (3) Add 30 mL of distilled water to the Erlenmeyer flask of the brown-yellow solid obtained in step (2), ultrasonicate for 15 minutes, obtain the yellow solution and filter it, remove insoluble matter, and centrifuge the obtained yellow solution at 10000 rpm for 10 minutes, Wash 3 times with water, take the upper layer of brown-yellow solution, dialyze the upper layer of brown-yellow solution in a 500Da dialysis bag for 72 hours, and freeze-dry for 48 hours to obtain yellow carbon dot powder;

[0042] (4) Mix and dissol...

Embodiment 2

[0049]This embodiment provides a method for preparing a room temperature phosphorescent material, which includes the following steps:

[0050] (1) Dissolve 0.102g neutral red and 6mL acrylic acid in 12mL distilled water to obtain a mixed solution;

[0051] (2) Place the mixed solution obtained in step (1) in a 25mL polytetrafluoroethylene autoclave, and heat it at 220°C for 4 hours to obtain an initial solution of carbon dots;

[0052] (3) Add 20 mL of distilled water to the initial solution obtained in step (2), ultrasonicate for 15 minutes, filter the solution to remove insoluble matter, centrifuge the obtained solution at a speed of 10,000 rpm for 10 minutes, wash with water 3 times, and take the upper layer solution, And the upper layer solution was dialyzed in a 500Da dialysis bag for 72 hours, and freeze-dried for 48 hours to obtain pink carbon dot powder;

[0053] (4) Mix and dissolve 9 mg of the carbon dot powder obtained in step (3) with 4 g of polyacrylamide in 30 m...

Embodiment 3

[0060] This embodiment provides a method for preparing a room temperature phosphorescent material, which includes the following steps:

[0061] (1) Dissolve 6 mL of acrylic acid and 2 mL of ethylenediamine in 10 mL of distilled water, and stir thoroughly to obtain a mixed solution;

[0062] (2) Place the mixed solution obtained in step (1) in a 100mL Erlenmeyer flask, and heat it in a microwave oven at 650W for 3 minutes to obtain a brownish-yellow solid;

[0063] (3) Add 30 mL of distilled water to the Erlenmeyer flask of the brownish-yellow solid obtained in step (2), and ultrasonicate for 5 minutes to obtain a yellow solution, filter it, remove insoluble matter, and centrifuge the obtained yellow solution at a speed of 3000 rpm for 15 minutes. Wash 3 times with water, take the upper layer of brown-yellow solution, dialyze the upper layer of brown-yellow solution in a 500Da dialysis bag for 48 hours, and freeze-dry for 36 hours to obtain yellow carbon dot powder;

[0064] (...

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Abstract

The invention aims at solving the problem that an existing prepared carbon dot composite material rarely has a phosphorescent phenomenon, and provides a room-temperature phosphorescent material basedon carbon dots in a composite matrix as well as a preparation method and application of the room-temperature phosphorescent material. The phosphorescent material is composed of carbon dots and polyacrylamide, the polyacrylamide is used as a composite matrix, and the carbon dots are uniformly dispersed in the composite matrix; the carbon dots are carbon dots 1 or carbon dots 2; and the raw materials of the carbon dots 1 are acrylic acid and ethylenediamine, and the raw materials of the carbon dots 2 are neutral red and acrylic acid. The phosphorescent material takes the carbon dots as a raw material, the polyacrylamide as a matrix and a used solvent as water, the raw material is cheap, the synthesis method is simple, the reaction condition is mild, and the phosphorescent material can be obtained by adopting microwave, hydrothermal and simple oven drying, and is suitable for mass production. The composite matrix is introduced to inhibit a non-radiation quenching process of the carbon dots, the carbon dots can be uniformly dispersed in the composite matrix, and no obvious aggregation or layering phenomenon exists.

Description

technical field [0001] The invention belongs to the technical field of phosphorescent luminescent materials, and in particular relates to the preparation of room-temperature phosphorescence from a carbon dot / polyacrylamide composite material and its potential application in anti-counterfeiting. Background technique [0002] Phosphorescence is a slow-emitting photoluminescence phenomenon. When a substance at room temperature is irradiated by incident light of a certain wavelength (usually ultraviolet or X-ray), it absorbs light energy and enters an excited state (usually with a different spin multiplicity from the ground state), and then slowly de-excites and emits Outgoing light with a long wavelength of the incident light (usually the wavelength is in the visible light band). The luminescence persists after the incident light ceases. [0003] Most of the existing phosphorescent materials contain metal ions as a ligand to achieve phosphorescence, and the structure is relat...

Claims

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Application Information

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IPC IPC(8): C09K11/65C09K11/02B82Y20/00B82Y30/00B82Y40/00
CPCC09K11/65C09K11/025B82Y20/00B82Y40/00B82Y30/00
Inventor 于洪梅王慧永陈伟周露
Owner UNIV OF SCI & TECH LIAONING