Preparation method of silica-coated all-inorganic perovskite core-shell structure quantum dots
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A silicon dioxide, core-shell structure technology, applied in chemical instruments and methods, luminescent materials, nanotechnology, etc., can solve problems such as optical parameter discount, and achieve the effects of short synthesis cycle, high quantum efficiency, and improved stability
Active Publication Date: 2020-05-29
SHANGHAI INST OF TECH
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However, the all-inorganic perovskite quantum dot CsPbBrBr3 has a large number of excellent optical properties, but it is extremely sensitive to air, humidity, light and temperature, which greatly reduces its excellent optical parameters.
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Embodiment 1
[0031] The raw material purity used in this embodiment is as follows:
[0033] Press as figure 1 The shown method prepares silica-coated CsPbBr at room temperature 3 / Cs 4 PbBr 6 Core-shell quantum dots.
[0034] Step 1): Inject 0.326g (1mmol) of cesium carbonate into 5ml of n-octanoic acid, and stir at room temperature for 15min to obtain a cesium precursor solution.
[0035] Step 2): 0.367g (1mmol) of lead bromide and 1.094g (2mmol) of tetraoctylammonium bromide were simultaneously added to 3ml of toluene, and magnetically stirred for 20min to obtain a lead bromide / toluene solution.
[0036] Step 3): Rapidly inject 0.7ml APTES into the lead bromide / toluene solution in step 2), and stir magnetically for 15s.
[0037] Step 4): quickly inject the cesium precursor solution in step 1)...
Embodiment 2- Embodiment 4
[0060] Compared with Example 1, most of them are the same, except that the aminosilane coupling agent used in this example is replaced by 3-aminopropyltrimethoxysilane, 3-aminopropylmethyldimethoxysilane or 3-(2-Aminoethylamino)propylmethyldimethoxysilane
Embodiment 5- Embodiment 6
[0062] Compared with Example 1, most of them are the same, except that the stirring time in step 3) of this example is 5s or 30s respectively.
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Abstract
The invention relates to a preparation method of silica-coated all-inorganic perovskite core-shell structure quantum dots. The preparation method comprises the following steps: completely dissolving cesium carbonate in n-caprylic acid to obtain a cesium precursor solution, dissolving lead bromide and tetra-n-octylammonium bromide in toluene to obtain a lead bromide/toluene solution; and then, sequentially adding an aminosilane coupling agent and the cesium precursor solution into the lead bromide/toluene solution, stirring for reaction, and separating and drying an obtained product to obtain the target product. Compared with the prior art, the preparation method disclosed by the invention is simple and loose in condition, the fluorescence characteristic of the prepared product is not reduced, the stability is greatly improved compared with that of pure CsPbBr3, and the product can be used as fluorescent powder to be packaged into a photoelectric device for application.
Description
technical field [0001] The invention belongs to the technical field of synthesis of semiconductor luminescent materials, and relates to a method for preparing quantum dots with a silicon dioxide-coated all-inorganic perovskite core-shell structure. Background technique [0002] Perovskite quantum dots have the characteristics of narrow emission peak width at half maximum, high quantum efficiency, wide color gamut and easy spectrum tuning, and have great application potential in semiconductor lighting, solar cells, display devices, biomedicine and other fields. However, the all-inorganic perovskite quantum dots CsPbBr 3 While having a large number of excellent optical characteristics, it is extremely sensitive to air, humidity, light and temperature, which greatly reduces its excellent optical parameters. Therefore, how to promote CsPbBr 3 The stability of is a hot spot in current research field. Contents of the invention [0003] The object of the present invention is t...
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