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Halogenated lead-caesium perovskite fluorescent material and preparation method thereof

A fluorescent material, perovskite technology, applied in the field of fluorescent materials, can solve the problems of easy decomposition, fluorescence quenching, loss of optical properties, etc.

Inactive Publication Date: 2019-02-22
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the poor stability of perovskite itself, it is easy to decompose under air, light, and heat conditions, and fluorescence quenching occurs, and optical properties are lost. These shortcomings have always plagued many researchers.

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  • Halogenated lead-caesium perovskite fluorescent material and preparation method thereof
  • Halogenated lead-caesium perovskite fluorescent material and preparation method thereof

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preparation example Construction

[0031] The present invention provides the preparation method of the lead-halide cesium perovskite fluorescent material described in the above technical scheme, comprising the following steps:

[0032] Under the condition of stirring, the protonated carbon nitride dispersion liquid is added dropwise into the lead halide cesium quantum dot dispersion liquid, and the protonated carbon nitride and the halide lead cesium quantum dots self-assemble to obtain the lead halide cesium perovskite fluorescent material.

[0033] In the present invention, the solvent in the protonated carbon nitride dispersion is preferably N,N-dimethylformamide (DMF), and the concentration of the protonated carbon nitride dispersion in the protonated carbon nitride dispersion is preferably 8-12 mg / mL, more preferably 10 mg / mL. The present invention has no special limitation on the preparation method of the protonated carbon nitride dispersion liquid, and the preparation method well known to those skilled i...

Embodiment 1

[0051] Preparation of protonated carbon nitride dispersion includes the following steps:

[0052] In nitrogen protection, urea is heated from room temperature to 550 °C at a rate of 5 °C / min, and heat-treated for 2 hours at an insulated temperature; after completing the heat treatment, it is naturally cooled to room temperature and ground to obtain carbon nitride (g-C 3 N 4 );

[0053] 10 mg of the carbon nitride was mixed with 2 mL of HBr solution (mass concentration: 48%), and ultrasonically performed protonation treatment for 10 h. After the protonation treatment was completed, the obtained system was centrifuged at a speed of 6500 r / min for 10 min. The obtained supernatant was evaporated to dryness in an oil bath at 80°C, and then the obtained residue was vacuum-dried at 50°C for 12 hours, and the obtained light yellow powder was protonated carbon nitride (PCN);

[0054] Weigh 10 mg of the protonated carbon nitride and 1 mL of N,N-dimethylformamide and ultrasonically mix...

Embodiment 2

[0062] Prepare the lead-halide cesium perovskite fluorescent material according to the method of Example 1, the difference is that when preparing the lead-halide cesium quantum dot dispersion, CsPbBr 3 The consumption of stock solution is 0.8mL, ZnI 2 The amount of N,N-dimethylformamide solution is 0.04mL; then use the obtained 20.84mL lead halide cesium quantum dot dispersion (CsPb(Br / I) 3 dispersion, the CsPb(Br / I) 3 The molar ratio of Br and I is 8:2, which can be specifically expressed as CsPb(Br0.8 / I 0.2 ) 3 ) and 91.75 μL protonated carbon nitride dispersion liquid to prepare halide-lead-cesium perovskite fluorescent material (PCN / CsPb(Br / I) 3 , specifically expressed as PCN / CsPb(Br 0.8 / I 0.2 ) 3 ).

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Abstract

The invention provides a halogenated lead-caesium perovskite fluorescent material. A halogenated lead-caesium quantum dot is modified by adopting protonized carbon nitride, and is induced for self-assembly, and the appearance is turned to a two-dimensional flake structure from the previous spherical shape, but the crystal form cannot be changed; and the defect of the halogenated lead-caesium quantum dot surface can be passivated by the protonized carbon nitride, and the performance in each aspect of the lead-caesium quantum dot can be improved. The experimental result of the embodiment indicates that, compared with an unmodified halogenated lead-caesium quantum dot, the halogenated lead-caesium perovskite fluorescent material has the advantages of relatively high ultraviolet absorption strength and fluorescent strength and long fluorescent service life; and stability of the material is relatively high, and is almost unchanged when being subjected to ultrasonic dispersion in alcohol for2 hours under the condition of concentration being 0.5mg / mL, but the stability of the unmodified halogenated lead-caesium quantum dot is only kept at 58.65 percent under the same condition.

Description

technical field [0001] The invention relates to the technical field of fluorescent materials, in particular to a lead-halide-cesium perovskite fluorescent material and a preparation method thereof. Background technique [0002] Inorganic halide perovskite nanocrystals have attracted much attention in optoelectronic applications due to their excellent luminescent properties, tunable spectra, and high photoluminescence quantum yield (PLQY). While the optical and electronic properties of nanocrystals (NCs) are closely related to their geometry and size, the preparation of stable nanomaterials with controllable morphology and tunable size is an important goal in the field of chemistry. [0003] Inorganic halide perovskite nanocrystals can be synthesized by reprecipitation method at room temperature, and by changing ligands and solvents, the preparation of halide perovskite nanocrystals with controllable size and shape has been achieved. However, due to the poor stability of per...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/66
CPCC09K11/025C09K11/665
Inventor 庞起辛友伶金鹏马秋霞王桑妮
Owner GUANGXI UNIV
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