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Novel rubidium bismuth chloride perovskite nanocrystalline Rb7Bi3Cl16 and preparation method thereof

A perovskite and nanocrystal technology, applied in nanotechnology, chemical instruments and methods, bismuth compounds, etc., can solve the problems that restrict the application and promotion of perovskite nanocrystals, strong lead toxicity, easy degradation, etc., and achieve morphology and Uniform particle size, simple method, and good thermal stability

Inactive Publication Date: 2019-06-25
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current perovskite nanocrystals are mainly based on lead-based perovskites, such as CsPbX 3 , (CH 3 NH 3 )PbX 3 (X=Cl, Br, I), etc., there are problems that the toxicity of lead is strong and lead-based perovskites are easily degraded by water, light and heat, which seriously restricts the application and promotion of perovskite nanocrystals.

Method used

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  • Novel rubidium bismuth chloride perovskite nanocrystalline Rb7Bi3Cl16 and preparation method thereof
  • Novel rubidium bismuth chloride perovskite nanocrystalline Rb7Bi3Cl16 and preparation method thereof
  • Novel rubidium bismuth chloride perovskite nanocrystalline Rb7Bi3Cl16 and preparation method thereof

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Embodiment 1

[0029] Example 1 sample preparation

[0030] As a new type of rubidium bismuth chloride perovskite nanocrystalline material Rb 7 Bi 3 Cl 16 The preferred embodiment, its method is as follows: raw material RbCl, BiCl 3 , polar solvent, straight-chain organic amine and straight-chain organic carboxylic acid are mixed according to a certain ratio and placed in a sample bottle for ultrasonication, and then a constant temperature reaction is carried out. The reaction temperature is 60-100°C, and the reaction time is 1-4 hours. Slowly at room temperature, the reaction solution was dispersed in a weak polar solvent at a ratio of 1:10, and the large particles were removed by centrifugation to obtain clear and transparent Rb 7 Bi 3 Cl 16 Nanocrystalline Colloidal Solution. The relationship between the reaction ratio and conditions of the experiment and the sample number is shown in Table 1.

[0031] Table 1 Relationship between sample synthesis conditions and sample numbers

[...

Embodiment 3

[0035] Preparation and structure analysis of embodiment 3 sample crystal

[0036] To test Rb 7 Bi 3 Cl 16 Nanocrystalline composition and structure, Rb was synthesized by hydrothermal method 7 Bi 3 Cl 16 Single crystal, the specific method is as follows: RbCl and BiCl 3 According to the ratio of 1:2.33, it was mixed and dissolved in concentrated hydrochloric acid, hydrothermally reacted at 160°C for 24 hours, and then slowly cooled and crystallized to obtain transparent block crystals. And using single crystal X-ray diffraction to analyze the Rb 7 Bi 3 Cl 16 Single crystal structure analysis.

[0037] The single crystal X-ray diffraction was performed on a Rigaku Mercury CCD type X-ray single crystal diffractometer from Bruker, Germany. The data collection temperature is 293K, and the diffraction light source is the Mo-Kα ray monochromated by graphite The scanning method is ω-2θ; the data is processed by the Multi-Scan method for absorption correction. The struc...

Embodiment 4

[0041] Embodiment 4 fluorescence test experiment and result

[0042] The fluorescence test experiment of sample 1# is as follows: Adopt Cary Eclipse spectrofluorometer (Varian, America) and QM / TM 3360 (PTI, America), carry out fluorescence detection to sample 1#, its excitation wavelength is 365nm, and emission wavelength is 437nm . Taking quinine sulfate as a standard, the calculated relative fluorescence quantum yield is 28.43%. The test results showed that Rb 7 Bi 3 Cl 16 Nanocrystals have very good blue fluorescence, such as Figure 5 .

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Abstract

The invention discloses a crystal structure and a preparation method of a novel rubidium bismuth chloride perovskite nanocrystalline material. The chemical formula of the crystalline material is Rb7Bi3Cl16, which belongs to a trigonal crystal system, has a space group of P-31c, and the cell parameters of alpha=beta=90 degrees, gamma=120 degrees and Z=2. The preparation method of the nanocrystalline material mainly uses a polar solvent to dissolve bismuth chloride and rubidium chloride, takes linear chain organic amine and organic carboxylic acid as the surfactant, and adopts a weakly polar solvent as the dispersant for dispersion. The obtained nanocrystalline has good fluorescence properties, an excitation wavelength of 365nm, an emission wavelength of 437nm, and a fluorescence quantum yield up to 28.43%, at the same time also has good thermal stability, water stability and light stability. The nanocrystalline material has broad application prospects in photoelectric fields like LED, bioimaging, fluorescence detection and other aspects.

Description

technical field [0001] The application relates to the structure and preparation method of a novel rubidium bismuth chloride perovskite nanocrystal material. Background technique [0002] Perovskite nanocrystals have become one of the new generation of popular optoelectronic materials due to their high quantum yield, adjustable energy band, high color purity, easy preparation and low cost. They have broad applications in the fields of display and medicine. Application prospect. However, the current perovskite nanocrystals are mainly based on lead-based perovskites, such as CsPbX 3 , (CH 3 NH 3 )PbX 3 (X=Cl, Br, I), etc., there are problems such as the strong toxicity of lead and the easy degradation of lead-based perovskites when exposed to water, light and heat, which seriously restricts the application and promotion of perovskite nanocrystals. To this end, scholars have proposed a strategy of metal replacement, that is, to use ns with similar ns to lead 2 Electronic a...

Claims

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Application Information

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IPC IPC(8): C01G29/00B82Y40/00
Inventor 宋俊玲谢杰灵
Owner JIANGNAN UNIV
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