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A preparation method for controlling the morphology and fluorescence wavelength of inorganic perovskite nanocrystals by using the pH value of aqueous solution

A fluorescent wavelength and inorganic calcium technology, applied in the field of perovskite nanocrystal synthesis, can solve the problems of limiting the application of inorganic perovskite nanocrystals and low quantum efficiency, and achieve the effects of easy storage and transportation, simple methods, and precise regulation

Active Publication Date: 2022-12-02
QUFU NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, blue-light inorganic perovskite nanocrystals prepared by tuning halogen elements still suffer from low quantum efficiency (<10%), thus limiting the application of inorganic perovskite nanocrystals in devices.

Method used

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  • A preparation method for controlling the morphology and fluorescence wavelength of inorganic perovskite nanocrystals by using the pH value of aqueous solution
  • A preparation method for controlling the morphology and fluorescence wavelength of inorganic perovskite nanocrystals by using the pH value of aqueous solution
  • A preparation method for controlling the morphology and fluorescence wavelength of inorganic perovskite nanocrystals by using the pH value of aqueous solution

Examples

Experimental program
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Effect test

Embodiment 1

[0026] (1) Mix 0.0525 g cesium bromide, 0.0925 g PbBr 2 , 315 μL oleic acid, 315 μL oleylamine, 5 ml 1, 4 dioxane, 75 μL deionized water mixed, continuous ultrasound or stirring at room temperature, can prepare CsPbBr 3 Colloidal solution of nanoblocks;

[0027] (2) CsPbBr 3 Colloidal solution of nanoblocks CsPbBr can be obtained after the colloidal solution is centrifuged at 10,000 r / min for 8 min, the supernatant is discarded, and dried in a vacuum oven at 50°C for 7 hours. 3 Nanoblock powder.

Embodiment 2

[0029] (1) Mix 0.0525 g cesium bromide, 0.0925 g PbBr 2 , 315μL oleic acid, 315μL oleylamine, 5ml 1, 4 dioxane, 75ul hydrochloric acid aqueous solution are mixed, and continuous ultrasonication or stirring at room temperature can prepare CsPbBr 3 Colloidal solution of nanowires, the concentration of the hydrochloric acid aqueous solution is: 1 ml of 37% concentrated brine mixed with 100 ml of water, namely 0.12 mol / ml;

[0030] (2) CsPbBr 3 Colloidal solution of nanoblocks CsPbBr can be obtained after the colloidal solution is centrifuged at 10,000 r / min for 8 min, the supernatant is discarded, and dried in a drying oven at 50°C for 7 hours. 3 nanowire powder.

Embodiment 3

[0032] (1) Mix 0.0525 g cesium bromide, 0.0925 g PbBr 2 , 315 μL oleic acid, 315 μL oleylamine, 5 ml 14-dioxane, and 75 μL hydrochloric acid aqueous solution are mixed, continuously ultrasonicated or stirred, and CsPbBr can be prepared 3 Colloidal solution of nanowires, the concentration of the hydrochloric acid aqueous solution is: 2 ml of 37% concentrated brine mixed with 100 ml of water, namely 0.24 mol / ml;

[0033] (2) CsPbBr 3 Colloidal solution of nanoblocks CsPbBr can be obtained after the colloidal solution is centrifuged at 10,000 r / min for 8 min, the supernatant is discarded, and dried in a drying oven at 50°C for 7 hours. 3 nanowire powder.

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Abstract

The invention discloses a preparation method for regulating the morphology and fluorescence wavelength of inorganic perovskite nanocrystals by utilizing the pH value of an aqueous solution. Mix monovalent cation compounds, halides, ligands, weakly polar or nonpolar organic solvents, neutral or acidic aqueous solutions, and continuously ultrasonicate or stir at room temperature to prepare metal halide inorganic perovskite nanocrystals in one step , after separation, purification and drying, the organic perovskite nanocrystalline powder can be obtained. Adding an aqueous solution changes from neutral to acidic, inorganic perovskite nanocrystals change from nanoblocks to nanowires, and the fluorescence wavelength blue shifts. The preparation method is simple to operate, the fluorescence wavelength can be precisely adjusted, the quantum efficiency is high, and the cost is low, so it has strong application value.

Description

technical field [0001] The invention relates to a preparation method for regulating the morphology and fluorescence wavelength of inorganic perovskite nanocrystals by utilizing the pH value of an aqueous solution, and belongs to the technical field of perovskite nanocrystal synthesis. Background technique [0002] In recent years, inorganic perovskite nanocrystals, as a new type of semiconductor material and highly efficient tunable light source, have been widely used in the fields of displays, light-emitting devices, and lasers. In order to fundamentally understand the relationship between the structure and performance of inorganic perovskite nanocrystals, and to meet the needs of various technical applications, it is particularly important to prepare inorganic nanocrystals with high stability and controllable properties. [0003] Inorganic perovskite nanocrystals with controllable halide compositions and tunable emission wavelengths have covered the entire visible waveleng...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G21/00C09K11/66B82Y40/00B82Y20/00
CPCC01G21/006C09K11/665B82Y40/00B82Y20/00C01P2004/04C01P2006/60C01P2002/72
Inventor 孔晓波刘丽娟
Owner QUFU NORMAL UNIV
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