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Nitrogen point-based room-temperature phosphorescent material and preparation method and application thereof

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

Active Publication Date: 2020-09-15
SHENZHEN UNIV
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  • 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

Method used

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  • Nitrogen point-based room-temperature phosphorescent material and preparation method and application thereof
  • Nitrogen point-based room-temperature phosphorescent material and preparation method and application thereof
  • Nitrogen point-based room-temperature phosphorescent material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0050] (1) 2-azido imidazole (structure is ) preparation

[0051] Take by weighing 4.09g 2-aminoimidazoles (structure is ) into the reaction flask, add 32mL hydrochloric acid (5.0mol / L), ice-water bath, add 2.77g sodium nitrite (48mL) aqueous solution while stirring; then add 16.3mL sodium azide (2.66g) aqueous solution, and react at room temperature for 2h. After the reaction, use NaHCO 3 Adjust the pH value to 7.0-7.5, extract with ethyl acetate (3 × 10mL), and use anhydrous Na 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 rotary evaporated under reduced pressure to obtain the product.

[0052] (2) Preparation of fluorescent nitrogen dots

[0053] Weigh 1.0 g of 2-azidoimidazole and 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 nitrogen point ...

Embodiment 2

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

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

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

Embodiment 3

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

[0062] According to fluorescent nitrogen dots and polyvinyl alcohol (PVA for short, ) with a mass ratio of 1:50, the aqueous solution of the fluorescent nitrogen dots prepared in Example 1 is mixed with polyvinyl alcohol. Stir at room temperature for 3 hours, centrifuge at 11,000 r / min for 10 minutes after the reaction, and freeze-dry the lower solid for 48 hours to obtain a room temperature phosphorescent material, which is named Ndots@PVA.

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

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Abstract

The invention discloses a nitrogen point-based room-temperature phosphorescent material and a preparation method and application thereof. The preparation method comprises the following steps: taking 2-azido imidazole with high reaction activity (azido at the 2 position) as a precursor, carrying out self-polymerization and nucleophilic polymerization in the presence of a liquid nucleophilic reagentto obtain a fluorescent nitrogen point; and enabling the fluorescent nitrogen point to be compounded with a substrate material so as to prepare the room-temperature phosphorescent material. The method for preparing the room-temperature phosphorescent material is simple, controllable, low in energy consumption, convenient to operate, not harsh in condition, good in reproducibility and beneficial to expanded production. The room-temperature phosphorescent material prepared by the method has the characteristics of strong luminescence and good stability, and still has excellent room-temperature phosphorescent characteristics, ultra-long phosphorescent service life and long afterglow time in an amorphous or glassy state; the material can be applied to the fields of environmental detection andbiochemical analysis, and can also be used for preparing fluorescent ink for ink-jet printing, anti-counterfeiting marks and the like.

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, a preparation method and application thereof. Background technique [0002] Phosphorescent materials have always been widely concerned in the fields of materials science, chemistry and life sciences, and their applications in information encryption, invisible inks, biological imaging and other research fields have made great progress. The unique advantage of room temperature phosphorescent materials is that they have a long luminous lifetime, which can eliminate short-lived fluorescence and light scattering backgrounds, and improve the signal-to-noise ratio of analytical detection and biological imaging. They are important carriers of photon encryption information and important materials for detection and imaging analysis. At present, there are two main methods to obtain room temperature phosphore...

Claims

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Application Information

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Patent Type & Authority Applications(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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