Method for synergistically enhancing ultraviolet radiation stability and optical performance of Mn:CsPbCl3 nanocrystals

A technology of ultraviolet radiation and stability, applied in the fields of nano-optics, chemical instruments and methods, nanotechnology, etc., can solve the problems of reducing the luminescence properties of nanocrystals, complicated preparation methods, increasing coating process steps, etc., and achieve excellent resistance to ultraviolet radiation. Illumination ability, simple process steps, the effect of slowing down the luminous intensity and fluorescence lifetime decay

Active Publication Date: 2019-12-13
GUANGXI UNIV
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Problems solved by technology

In the above studies, although the method of modifying the surface coating of nanocrystals is used to effectively improve the Mn:CsPbCl 3 UV radiation stability, but there are still some deficiencies: 1. It is necessary to obtain Mn:CsPbCl in the preparation 3 After the nanocrystals, the nanocrystal surface coating process is carried out, that is to say, the coating process steps need to be increased, which makes the preparation method complicate...

Method used

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  • Method for synergistically enhancing ultraviolet radiation stability and optical performance of Mn:CsPbCl3 nanocrystals
  • Method for synergistically enhancing ultraviolet radiation stability and optical performance of Mn:CsPbCl3 nanocrystals
  • Method for synergistically enhancing ultraviolet radiation stability and optical performance of Mn:CsPbCl3 nanocrystals

Examples

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Embodiment 1

[0035] 1) Preparation of cesium oleate solution: put cesium carbonate (0.675mmol) and octadecene (10mL) into a 50mL three-necked flask, and dry at 120°C for 60min under an argon atmosphere; then, inject Oleic acid (1.25mL), the mixed solution was heated to 150°C under the protection of argon, and after keeping for 10 minutes, it was naturally cooled to obtain a cesium oleate solution;

[0036] 2) Preparation of Sn precursor: Put (1mmol) tin salt, octadecene (9mL) and oleylamine (1mL) into a 50mL three-necked flask, and react for 60min at 150°C under an argon atmosphere , naturally cooled to form a Sn precursor;

[0037] 3) Add manganese chloride (0.2mmol), lead chloride (0.2mmol) and Sn precursor (1mL) in step 2) together with octadecene (5mL), oleic acid (1.5mL), oleylamine (1.5mL) and trioctylphosphine (1mL) into a three-necked flask of 50mL specification; after stirring and degassing under vacuum at 110°C for 30min, a transparent solution was formed; in this embodiment, th...

Embodiment 2

[0041] The difference between this example and Example 1 is that in step 3) the Sn precursor (2mL) in manganese chloride (0.2mmol), lead chloride (0.2mmol) and step 2) together with octadecene (5mL), Oleic acid (1.5mL), oleylamine (1.5mL) and trioctylphosphine (1mL) were charged together into a 50mL three-neck flask; after stirring and degassing under vacuum at 110°C for 30min, a transparent solution was formed; this In the embodiment, the molar ratio of Mn / Pb in the Sn precursor, manganese chloride, and lead chloride is 1 / 1; the molar ratio of Sn / Pb is 1 / 1; other steps are the same as in the first embodiment.

Embodiment 3

[0049] 1) Preparation of cesium oleate solution: put cesium carbonate (0.6mmol) and octadecene (9mL) into a 50mL three-necked flask, and dry for 40min under an argon atmosphere at 130°C; then, inject Oleic acid (1mL), the mixed solution was heated to 180°C under the protection of argon, and after keeping for 8 minutes, it was naturally cooled to obtain a cesium oleate solution;

[0050] 2) Preparation of Sn precursor: put (2mmol) tin salt, octadecene (7mL) and oleylamine (3mL) into a 50mL three-necked flask, and react for 50min at 160°C under an argon atmosphere , naturally cooled to form a Sn precursor;

[0051] 3) Manganese chloride (0.2 mmol), lead chloride (0.2 mmol) and Sn precursor (1 mL) in step 2) together with octadecene (8 mL), oleic acid (1 mL), oleylamine (1 mL) and tris Octylphosphine (0.5mL) was packed together in a 50mL three-necked flask; after stirring and degassing under vacuum at 120°C for 25min, a transparent solution was formed; in this example, the Sn pr...

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Abstract

The invention relates to the technical field of preparation of doped semiconductor nanometer materials for light emitting diodes, solar cells and other photoelectronic devices, particularly to a method for synergistically enhancing the ultraviolet radiation stability and the optical performance of Mn:CsPbCl3 nanocrystals. The method comprises: 1) preparing a cesium oleate solution; 2) preparing anSn precursor; 3) loading manganese chloride, lead chloride, the Sn precursor obtained in the step 2), octadecene, oleic acid, oleylamine and trioctylphosphine into a three-necked flask, wherein a molar ratio of Mn to Pb in the Sn precursor, the manganese chloride and the lead chloride is 1:1, and a molar ratio of Sn to Pb is less than 1/1; and 4) heating the transparent solution obtained in the step 3) to a temperature of 150-250 DEG C, measuring the solution obtained in the step 1), adding the solution obtained in the step (1) into the transparent solution obtained in the step (3), stirring,and cooling with an ice bath to obtain the Sn-doped Mn:CsPbCl3 nano-crystals. According to the present invention, with the method, the ultraviolet radiation resistance of the Mn:CsPbCl3 nano-crystalsis effectively improved, and the light emitting performance of the Mn:CsPbCl3 nano-crystals is improved.

Description

technical field [0001] The invention relates to the technical field of preparing doped semiconductor nanomaterials for optoelectronic devices such as light-emitting diodes and solar cells, in particular to a synergistically enhanced Mn:CsPbCl 3 Methods for UV radiation stability and optical properties of nanocrystals. [0002] technical background [0003] All-inorganic perovskite nanocrystals are widely used in solar cells, light-emitting diodes, and lasers due to their excellent optical properties and high charge mobility. In 2016, Klimov's research group and Dong Hee Son's research group reported a new type of nano-phosphor, Mn 2+ doped CsPbCl 3 (Mn:CsPbCl 3 ) nanocrystals, exhibiting bright orange-red Mn 2+ emission. Compared to CsPbCl 3 nanocrystalline, this novel Mn:CsPbCl 3 Nanocrystals have a larger Stokes shift to avoid self-absorption of nanocrystal luminescence, and at the same time show more excellent structural stability, making Mn:CsPbCl 3 Nanocrystals h...

Claims

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Application Information

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IPC IPC(8): C09K11/66B82Y20/00B82Y40/00
CPCC09K11/665B82Y20/00B82Y40/00Y02E10/52
Inventor 曹盛邹炳锁赵家龙
Owner GUANGXI UNIV
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