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A room temperature phosphorescent material based on nitrogen dots and its preparation method and application

A technology of room temperature phosphorescence and substrate materials, applied in the field of phosphorescent materials, can solve the problems of low fluorescence quantum yield, complex preparation process, and few active sites, and achieve the effect of strong luminescence, good reproducibility, and less harsh conditions

Active Publication Date: 2022-07-29
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a room-temperature phosphorescent material based on nitrogen dots and its preparation method and application, aiming to solve the problems of complex preparation process, high energy consumption and fluorescent quantum production of existing room-temperature phosphorescent materials. The problem of low efficiency and few active sites

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  • A room temperature phosphorescent material based on nitrogen dots and its preparation method and application
  • A room temperature phosphorescent material based on nitrogen dots and its preparation method and application
  • A room temperature phosphorescent material based on nitrogen dots and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0050] (1) 2-Azidoimidazole (structure is ) preparation

[0051] Weigh 4.09g of 2-aminoimidazole (structure is ) in the reaction flask, add 32 mL of hydrochloric acid (5.0 mol / L), ice-water bath, add 2.77 g of sodium nitrite (48 mL) aqueous solution while stirring; then add 16.3 mL of sodium azide (2.66 g) aqueous solution, and react at room temperature for 2 h. After the reaction, NaHCO was used 3 Adjust pH to 7.0-7.5, extract with ethyl acetate (3×10 mL), use anhydrous Na for organic phase 2 SO 4 Dry, filter, and rotary-evaporate to obtain a yellow solid, which is then separated and purified by silica gel column chromatography (petroleum ether:ethyl acetate=1:1), and the product is obtained by rotary-evaporation under reduced pressure.

[0052] (2) Preparation of fluorescent nitrogen dots

[0053] Weigh 1.0 g of 2-azidoimidazole, dissolve it in 100 mL of water, and react at room temperature for 12 h to obtain a crude fluorescent nitrogen dot product. Disperse the cru...

Embodiment 2

[0058] Example 2 Room temperature phosphorescent material: preparation of Ndots@CA

[0059] According to the fluorescent nitrogen point and cyanuric acid (cyanuric acid, CA for short), the structure is ) in a mass ratio of 1:100, the aqueous solution of the fluorescent nitrogen dots prepared in Example 1 was mixed with cyanuric acid, stirred at room temperature for 24h, centrifuged after the reaction, and centrifuged at a rotating speed of 9000r / min for 25min after the reaction. The lower layer of solid was freeze-dried for 12 h to obtain a room temperature phosphorescent material, which was named Ndots@CA.

[0060] At room temperature, the steady-state emission spectra of solid-state Ndots@CA after a delay of 1 ms as a function of excitation wavelength are as follows: Figure 9 shown. It can be seen that the solid-state Ndots@CA has excitation-dependent phosphorescence properties, and its steady-state emission spectrum red-shifts with the increase of its excitation wavelen...

Embodiment 3

[0061] Example 3 Room temperature phosphorescent materials based on nitrogen dots: preparation of Ndots@PVA

[0062] According to the fluorescent nitrogen point and polyvinyl alcohol (polyvinyl alcohol, PVA for short, ) in a mass ratio of 1:50, and the aqueous solution of fluorescent nitrogen dots prepared in Example 1 was mixed with polyvinyl alcohol. Stir at room temperature for 3 h, centrifuge at 11000 r / min for 10 min after the reaction, freeze-dry the lower layer for 48 h to obtain room temperature phosphorescent material, named Ndots@PVA.

[0063] At room temperature, the fluorescence spectrum of solid-state Ndots@PVA varies with excitation wavelength as follows: Figure 12 shown; at room temperature, the steady-state emission spectrum of solid-state Ndots@PVA after a delay of 1 ms varies with excitation wavelength as follows: Figure 13 shown. It can be seen that the solid-state Ndots@PVA has excitation light-dependent fluorescence and phosphorescence properties. A...

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Abstract

The invention discloses a nitrogen spot-based room temperature phosphorescent material and a preparation method and application thereof. The present invention obtains fluorescent nitrogen dots by using 2-azidoimidazole with high reactivity (azido group on the 2-position) as a precursor, and in the presence of a liquid nucleophile, performing self-polymerization and nucleophilic polymerization; and It is combined with the base material, that is, the method for preparing the room temperature phosphorescent material is simple and controllable, the energy consumption is low, the operation is convenient, the conditions are not harsh, and the reproducibility is good, which is beneficial to the expansion of production; the room temperature phosphorescent material prepared by this method has strong luminescence. , good stability, it still has excellent room temperature phosphorescence characteristics in amorphous or glassy state, ultra-long phosphorescence life and long afterglow time; it can be used in the fields of environmental detection, biochemical analysis, and can also be used for preparation spray Ink printing fluorescent ink, anti-counterfeiting signs, etc.

Description

technical field [0001] The invention relates to the technical field of phosphorescent materials, in particular to a room temperature phosphorescent material based on nitrogen dots and a preparation method and application thereof. Background technique [0002] Phosphorescent materials have always attracted extensive attention in the fields of materials science, chemistry and life sciences, and their applications in research fields such as information encryption, invisible ink, and biological imaging have made great progress. The unique advantage of room temperature phosphorescent materials is that they have a long luminescence lifetime, which can eliminate the short-lived fluorescence and light scattering background, improve the signal-to-noise ratio of analysis detection and biological imaging, and are an important carrier of photon encryption information and an important material for detection and imaging analysis. At present, there are two main methods for obtaining room t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65C09K11/02B82Y20/00B82Y40/00C09D11/50C09D11/30G09F3/02
CPCC09K11/65C09K11/0883C09K11/025B82Y20/00B82Y40/00C09D11/50C09D11/30G09F3/0294
Inventor 王东唐志姣熊玉吴洪卓
Owner SHENZHEN UNIV
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