A kind of multilevel chiral luminescence enhanced composite material and its preparation method

A composite material, luminescence enhancement technology, applied in luminescent materials, chemical instruments and methods, nanotechnology for materials and surface science, etc., can solve the problems of difficult to generate chiral structure, low quantum efficiency, etc. The effect of low preparation cost and simple method

Active Publication Date: 2022-04-29
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in general, the quantum efficiency of nano-perovskite materials is low, and it is not easy to generate chiral structures with the participation of achiral amines.

Method used

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  • A kind of multilevel chiral luminescence enhanced composite material and its preparation method
  • A kind of multilevel chiral luminescence enhanced composite material and its preparation method
  • A kind of multilevel chiral luminescence enhanced composite material and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0034] A composite material with multilevel chiral luminescence enhancement (AgNR@SiO 2 @L-cys @CsPbBr 3 ) of the preparation process is as follows, specifically divided into five steps:

[0035] 1. Synthesis of silver nanorods (AgNRs) aqueous solution:

[0036] Add 0.2 g of PVP to 25 mL of ethylene glycol, stir and dissolve, add 0.25 g of silver nitrate, add 3.75 g (concentration: 600 mmol / L) of ethylene glycol solution of ferric chloride after dissolving, stir well and transfer to oil In a bath, stir at 130°C for 5 hours. The crude product was then washed by centrifugation and finally dispersed in 10 mL of deionized water.

[0037] 2. AgNR@SiO with multi-level nanostructure 2 Synthesis of composite materials:

[0038] Add 2 mL of the silver nanorod aqueous solution prepared in step 1 into 20 mL of isopropanol, then add 20 microliters of TEOS and 10 microliters of APTES, stir well and then add 1.9 mL of ammonia solution. The solution was stirred at room temperature for ...

Embodiment 2

[0048] A composite material with multilevel chiral luminescence enhancement (AgNR@SiO 2 @L-cys @CsPbCl 3 ) of the preparation process is as follows, specifically divided into five steps:

[0049] 1. Synthesis of silver nanorods (AgNRs) aqueous solution:

[0050] Add 0.2 g of PVP to 25 mL of ethylene glycol, stir and dissolve, add 0.25 g of silver nitrate, add 3.75 g (concentration: 600 mmol / L) of ethylene glycol solution of ferric chloride after dissolving, stir well and transfer to oil In a bath, stir at 130°C for 5 hours. The crude product was then washed by centrifugation and finally dispersed in 10 mL of deionized water.

[0051] 2. AgNR@SiO with multi-level nanostructure 2 Synthesis of composite materials:

[0052] Add 2 mL of the silver nanorod aqueous solution prepared in Step 1 to 20 mL of isopropanol, then add 20 μl of TEOS and 10 μl of APTES, and then add 1.9 mL of ammonia solution. The solution was stirred at room temperature for 2 h. The crude product was th...

Embodiment 3

[0061] A composite material with multilevel chiral luminescence enhancement (AgNR@SiO 2 @L-cys @CsPbCl x Br 3-x ) of the preparation process is as follows, specifically divided into five steps:

[0062] 1. Synthesis of silver nanorods (AgNRs) aqueous solution:

[0063] Add 0.2 g of PVP to 25 mL of ethylene glycol, stir and dissolve, add 0.25 g of silver nitrate, add 3.75 g (concentration: 600 mmol / L) of ethylene glycol solution of ferric chloride after dissolving, stir well and transfer to oil In a bath, stir at 130°C for 5 hours. The crude product was then washed by centrifugation and finally dispersed in 10 mL of deionized water.

[0064] 2. AgNR@SiO with multi-level nanostructure 2 Synthesis of composite materials:

[0065] Add 2 mL of the silver nanorod aqueous solution prepared in Step 1 to 20 mL of isopropanol, then add 20 μl of TEOS and 10 μl of APTES, and then add 1.9 mL of ammonia solution. The solution was stirred at room temperature for 2 h. The crude produc...

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Abstract

The invention relates to a multi-level chiral light-emitting enhanced composite material of all-inorganic perovskite quantum dots coated with silver nanorods compounded with silicon dioxide and cysteine ​​and a preparation method thereof, belonging to the technical field of preparation of chiral light-emitting materials. One-dimensional silver nanorods are obtained through the reaction of polyols, and then AgNR@SiO is obtained through hydrolysis of TEOS and APTES. 2 , followed by stirring with cysteine ​​solution at room temperature to obtain AgNR@SiO 2 @L‑cys composite, and finally the composite is composited with all-inorganic perovskite quantum dots (QDs) prepared by thermal injection method to prepare AgNR@SiO with hierarchical nanostructure 2 @L‑cys@QDs chiral luminescence-enhanced composites. The material has a rod-like morphology, and the perovskite quantum dots are uniformly distributed on the surface, among which AgNR@SiO 2 @L‑cys @CsPbBr 3 With 87 times luminous enhancement. The invention has the advantages of low preparation cost, mass preparation, simple method, easy operation, good repeatability and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of chiral luminescent materials, in particular to a multi-level chiral luminescent enhanced composite material (AgNR@SiO 2 @L-cys@QDs) and methods for their preparation. Background technique [0002] Chirality is an essential attribute of structures without symmetry centers, symmetry planes, and anti-axis structures, and it exists widely in nature. This property not only has a wide range of applications in the fields of nonlinear optics and spintronics, but also is closely related to biological and pharmaceutical sciences. In the past few decades, compared with chiral organic molecules, chiral inorganic nanomaterials have attracted considerable attention due to their excellent optical and chemical properties, and have shown great potential in the fields of display, lighting, etc. . Among them, chiral perovskites have attracted extensive research due to their unique physical and chemical pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/06C09K11/02C09K11/59C09K11/66B82Y30/00B82Y40/00
CPCC09K11/06C09K11/02C09K11/592C09K11/665B82Y30/00B82Y40/00
Inventor 王宇李震颜岩赵佳奇
Owner JILIN UNIV
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