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Phosphorescent carbon dot, application of phosphorescent carbon dot in anti-counterfeiting and information encryption and LED lamp bead based on phosphorescent carbon dot

A technology of LED lamp beads and carbon dots, which is applied in the field of nanomaterials, can solve problems such as no public and reliable solutions, and achieve high efficiency, afterglow life, and long afterglow life.

Pending Publication Date: 2022-07-29
SUZHOU INST OF BIOMEDICAL ENG & TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are very few studies on the use of boric acid as a phosphorescent emission substrate, let alone a reliable scheme for preparing CD-based RTP materials using boric acid as a substrate.

Method used

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  • Phosphorescent carbon dot, application of phosphorescent carbon dot in anti-counterfeiting and information encryption and LED lamp bead based on phosphorescent carbon dot
  • Phosphorescent carbon dot, application of phosphorescent carbon dot in anti-counterfeiting and information encryption and LED lamp bead based on phosphorescent carbon dot
  • Phosphorescent carbon dot, application of phosphorescent carbon dot in anti-counterfeiting and information encryption and LED lamp bead based on phosphorescent carbon dot

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] This embodiment provides a phosphorescent carbon dot, which uses vitamin B1 as a precursor and is prepared by a two-step solvothermal method. The specific steps are:

[0048]1) 50 mg of vitamin B1 was added to 10 mL of deionized water, then 150 μL of ethylenediamine was added, the resulting mixture was placed in a polytetrafluoroethylene-lined stainless steel autoclave, and hydrothermally treated at 180° C. for 8 hours;

[0049] 2) After the reaction, cooled to room temperature, the product was centrifuged at 10,000 rpm for 10 minutes to remove the non-fluorescent precipitate to obtain a carbon dot solution;

[0050] 3) Take 100ul of the carbon dot solution obtained in step 2) and place it in a 30ml beaker, add 20mL of deionized water, then add 3g of boric acid, take a piece of tin foil to completely cover the beaker, and place it at the mouth of the beaker on the tin foil. Poke several small holes; then place the beaker covered with tinfoil in a drying oven and hydroth...

Embodiment 2

[0053] This embodiment provides an application of the phosphorescent carbon dots of Embodiment 1, which is applied to anti-counterfeiting and information encryption.

[0054] In a preferred embodiment, the phosphorescent carbon dots are applied to anti-counterfeiting, and the application method is as follows: using phosphorescent carbon dots to draw feature marks, and using non-phosphorescent carbon dots to draw interference marks, the feature marks and interference marks form anti-counterfeiting marks; Under the excitation light of 365 nm, the characteristic mark shows blue fluorescence, and the interference mark shows yellow fluorescence. When the excitation light at 365 nm is turned off, the characteristic mark shows green fluorescence, and the fluorescence of the interference mark disappears, so that the characteristic mark is used as special information for anti-counterfeiting.

[0055] In a preferred embodiment, the phosphorescent carbon dots are applied to information en...

Embodiment 3

[0057] This embodiment provides an LED lamp bead, which is prepared by the phosphorescent carbon dots of Embodiment 1.

[0058] The specific preparation method is as follows: mixing the phosphorescent carbon dot powder according to any one of claims 1-6 and epoxy resin AB glue, placing it in the center of the LED chip of ultraviolet light, then placing it in an oven, at 100° C. Dry for 1 hour and cool to room temperature to obtain LED lamp beads. The working voltage of the LED lamp bead is 3.0V.

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Abstract

The invention discloses a phosphorescent carbon dot. The phosphorescent carbon dot is prepared by the following method: 1) mixing vitamin B1 with ethylenediamine and carrying out hydrothermal treatment; 2) after the reaction is finished, centrifuging a product, and removing precipitate to obtain a carbon dot solution; 3) adding boric acid and carrying out hydrothermal treatment; and 4) after the reaction is finished, taking out a solid product, and grinding to obtain white powder, namely the phosphorescent carbon dots. The invention also provides an application of the phosphorescent carbon dot in anti-counterfeiting and information encryption and an LED lamp bead based on the phosphorescent carbon dot. According to the invention, phosphorescent carbon dots which can simultaneously show bright blue fluorescence emission and green RTP emission are prepared; the phosphorescence service life of the material is as long as 293 milliseconds, the macroscopic excellent green afterglow is as long as 7.0 seconds, and the phosphorescence quantum yield is as high as 12.69%; according to the method, a green strategy can be provided for extensible synthesis of the RTP carbon dot material, and the method has a great application prospect for manufacturing the RTP material with high efficiency and long afterglow life.

Description

technical field [0001] The invention relates to the field of nanomaterials, in particular to a phosphorescent carbon dot, its application in anti-counterfeiting and information encryption, and an LED lamp bead based thereon. Background technique [0002] Room temperature phosphorescence (RTP) materials have broad application prospects in the fields of optoelectronics, bioimaging, anti-counterfeiting, and information encryption due to their long lifetime and large Stokes shift. Currently the most effective RTP materials are metal-doped inorganic compounds and organometallic compounds. However, these materials are often composed of rare metals, are very expensive, and are cytotoxic, making the materials hard and unstable. And another pure organic RTP material, due to low crossover between systems and low preparation efficiency, the effect is not ideal. Therefore, it is very necessary to develop new metal-free RTP materials with low toxicity, environmental protection, long li...

Claims

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Application Information

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IPC IPC(8): C09K11/65C09K11/02C01B32/00B82Y20/00B82Y40/00H01L33/50C09D11/50
CPCC09K11/65C09K11/025C01B32/00B82Y20/00B82Y40/00H01L33/502C09D11/50
Inventor 李力程鸣鸣董文飞梅茜葛明锋常智敏从瑛哥
Owner SUZHOU INST OF BIOMEDICAL ENG & TECH CHINESE ACADEMY OF SCI
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