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Synthetic method for high-stability halogen perovskite quantum dot film based on multi-layer coating and used for X-ray imaging

A technology of multi-layer coating and synthesis method, applied in radiation intensity measurement, chemical instruments and methods, luminescent materials, etc., can solve problems such as limitations, and achieve the effects of improving stability, simple and efficient synthesis method, and reducing toxicity

Active Publication Date: 2019-08-16
杭州钛光科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these methods effectively improved the CsPbX 3 The light, water and thermal stability of quantum dots, but quantum dots mainly form large particles, which limits their applications in bioimaging, photocatalysis and LED display, etc.

Method used

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  • Synthetic method for high-stability halogen perovskite quantum dot film based on multi-layer coating and used for X-ray imaging
  • Synthetic method for high-stability halogen perovskite quantum dot film based on multi-layer coating and used for X-ray imaging
  • Synthetic method for high-stability halogen perovskite quantum dot film based on multi-layer coating and used for X-ray imaging

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Prepare cesium oleate precursor solution (1.1 mol / L). Add lead bromide (0.138 g), octadecene (10 mL) and oleic acid (0.1 mL) into a 100 mL three-neck round bottom flask, degas for a while and heat to 120o C. After the temperature stabilized, add 3-aminopropyltriethoxysilane (APTES) (1 mL). After APTES is completely dissolved to form a colorless and transparent clear solution, the temperature is raised to 140 o C and the temperature remains constant. The preheated cesium oleate precursor solution (1.5 mL) was instantly injected into the colorless and transparent clear solution. After reacting for 5 s, it was immediately ice-bathed and shaken vigorously to room temperature to obtain all-inorganic perovskite quantum dots. Add 40 mL of ethyl acetate to CsPbBr 3 In the quantum dot solution, the precipitate was collected by centrifugation at 10000 r / min for 1 min, dispersed in 3 mL of toluene solution, and then centrifuged at 8000 r / min for 2 min to collect the quantum dot ...

Embodiment 2

[0050] Prepare cesium oleate precursor solution (1.1 mol / L). Add lead bromide (0.138 g), octadecene (10 mL) and oleic acid (0.5 mL) into a 100 mL three-neck round bottom flask, degas for a while and heat to 120 o C. After the temperature stabilized, add 3-aminopropyltriethoxysilane (APTES) (1 mL). After APTES is completely dissolved to form a colorless and transparent clear solution, the temperature is raised to 140 o C and the temperature remains constant. The preheated cesium oleate precursor solution (1.5 mL) was instantly injected into the colorless and transparent clear solution. After reacting for 5 s, it was immediately ice-bathed and shaken vigorously to room temperature to obtain all-inorganic perovskite quantum dots. Add 40 mL of ethyl acetate to CsPbBr 3 In the quantum dot solution, the precipitate was collected by centrifugation at 10000 r / min for 1 min, dispersed in 3 mL of toluene solution, and then centrifuged at 8000 r / min for 2 min to collect the quantum do...

Embodiment 3

[0052] Prepare cesium oleate precursor solution (1.1 mol / L). Add lead bromide (0.138 g), octadecene (10 mL) and oleic acid (1 mL) into a 100 mL three-neck round bottom flask, degas for a while and heat to 120 o C. After the temperature stabilized, add 3-aminopropyltriethoxysilane (APTES) (1 mL). After APTES is completely dissolved to form a colorless and transparent clear solution, the temperature is raised to 140 o C and the temperature remains constant. The preheated cesium oleate precursor solution (1.5 mL) was instantly injected into the colorless and transparent clear solution. After reacting for 5 s, it was immediately ice-bathed and shaken vigorously to room temperature to obtain all-inorganic perovskite quantum dots. Add 40 mL of ethyl acetate to CsPbBr 3 In the quantum dot solution, the precipitate was collected by centrifugation at 10000 r / min for 1 min, dispersed in 3 mL of toluene solution, and then centrifuged at 8000 r / min for 2 min to collect the quantum dot ...

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Abstract

The invention discloses a synthetic method for a high-stability halogen perovskite quantum dot film based on multi-layer coating and used for X-ray imaging, and belongs to the technical field of preparation of inorganic semiconductor luminescent materials. The synthetic method comprises the following steps: preparing a Cs(OA) precursor solution, and performing a reaction on lead bromide, octadecene, oleic acid and 3-aminopropyltriethoxysilane to obtain a clear solution; pouring the clear solution instantaneously into the Cs(OA) precursor solution, and performing cooling and vigorous shaking toroom temperature to obtain a quantum dot solution; preparing a lead oleate precursor solution; preparing a first-layer coated quantum dot solution in different states; preparing a second-layer coatedquantum dot solution; preparing a multi-layer coated monodisperse quantum dot solution; and preparing the quantum dot film. According to the synthetic method provided by the invention, through the inorganic halogen perovskite quantum dot multi-layer coating strategy, a monodisperse core-shell structure is formed, the toxicity is reduced, and the stability of perovskite quantum dots is improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic semiconductor luminescent materials, and in particular relates to a synthesis method of a highly stable halogen perovskite quantum dot thin film for X-ray imaging based on multi-layer coating. Background technique [0002] All-inorganic perovskite quantum dots (CsPbX 3 , X=Cl, Br, I) is an ionic semiconductor material. The binding of ligands on the surface of quantum dots is in the process of dynamic adsorption. During the separation and purification process, it is easy to cause the loss of a large number of ligands, resulting in luminous efficiency and stability. This will restrict the practical application of quantum dots in optoelectronic display devices. In addition, the working principle of X-ray imaging equipment widely used at present is indirect imaging, that is, scintillator absorbs X-rays and emits fluorescence, and an area array detector detects the intensity of fluore...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/66G01T1/24
CPCC09K11/025C09K11/665G01T1/24
Inventor 李晓明孟翠芳杨丹丹
Owner 杭州钛光科技有限公司
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