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Red and green light perovskite quantum dot stable fluorescent powder based on SiO2 coating and preparation

A technology of silicon dioxide and quantum dots, applied in nanotechnology, nano-optics, luminescent materials, etc. for materials and surface science, can solve problems affecting luminous efficiency and purity, deterioration and agglomeration, poor stability, etc., to achieve suitable Effects of fluorescence lifetime, improved stability, and uniform size

Active Publication Date: 2020-03-10
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, this perovskite quantum dot has poor stability due to its material problems and large specific surface area.
It is easy to deteriorate and agglomerate in the air, thus affecting the luminous efficiency and purity

Method used

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  • Red and green light perovskite quantum dot stable fluorescent powder based on SiO2 coating and preparation
  • Red and green light perovskite quantum dot stable fluorescent powder based on SiO2 coating and preparation
  • Red and green light perovskite quantum dot stable fluorescent powder based on SiO2 coating and preparation

Examples

Experimental program
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Effect test

Embodiment 1

[0035] A preparation process based on silicon dioxide-coated green light perovskite quantum dot stabilized phosphor, specifically comprising the following steps:

[0036] (1) Accurately weigh 0.407 g of cesium carbonate, 1.5 mL of oleic acid, and 20 mL of octadecene into a two-neck round bottom flask. Heat to 130°C under vacuum and keep for 1h. Then the temperature was lowered to 100°C, and nitrogen gas was introduced.

[0037] (2) Accurately weigh PbBr 2 0.276g, measure 20mL of octadecene, 2mL of oleic acid, and 2mL of oleylamine, add it to a 100mL three-neck round bottom flask, heat to 120°C under vacuum, and keep for 1h. Nitrogen gas was then introduced, and the temperature was rapidly raised to 180°C.

[0038] (3) Draw 1.6mL of cesium oleate precursor solution into PbBr quickly with a syringe 2 After 5 s in the precursor solution, it was quickly cooled to room temperature in an ice-water bath.

[0039] (4) Centrifuge the above-mentioned liquid product at 5000rpm to t...

Embodiment 2

[0045] A preparation process based on silica-coated red light perovskite quantum dot stabilized phosphor, specifically comprising the following steps:

[0046] (1) Accurately weigh 0.407 g of cesium carbonate, 1.5 mL of oleic acid, and 20 mL of octadecene into a two-neck round bottom flask. Heat to 130°C under vacuum and keep for 1h. Then the temperature was lowered to 100°C, and nitrogen gas was introduced.

[0047] (2) Accurately weigh PbBr 2 0.1104g, PbI 2 0.208g, measure 20mL of octadecene, 2mL of oleic acid, and 2mL of oleylamine, add it into a 100mL three-neck round bottom flask, heat to 120°C under vacuum, and keep for 1h. Nitrogen gas was then introduced, and the temperature was rapidly raised to 180°C.

[0048] (3) Draw 1.6mL of cesium oleate precursor solution into PbBr quickly with a syringe 2 After 5 s in the precursor solution, it was quickly cooled to room temperature in an ice-water bath.

[0049] (4) Centrifuge the above-mentioned liquid product at 5000rp...

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Abstract

The invention discloses a red and green light perovskite quantum dot stable fluorescent powder based on SiO2 coating and a preparation method thereof and belongs to the field of luminescent materials;the method includes: 1) mixing, stirring and heating oleic acid, octadecene and Cs2CO3 to prepare a cesium oleate precursor solution; 2) with lead halide, oleylamine, oleic acid, and octadecene beingraw materials, heating and stirring the raw materials in a nitrogen atmosphere to prepare a lead halide precursor solution; 3) heating the lead halide precursor solution to a high temperature and injecting the cesium oleate precursor solution, and rapidly cooling the mixture to prepare a crude product of the perovskite quantum dots; 4) centrifuging and dispersing the crude product in n-hexane toobtain pure colloidal quantum dots, and adding metered (3-aminopropyl)triethoxysilane (APTES, similarly hereinafter) and mixing and stirring all the components to prepare the quantum dot stable fluorescent powder. The quantum dot stable fluorescent powder has high luminous efficiency and high color purity, has narrow emission peaks at 637 nm and 522 nm; after the SiO2 coating, the product is relatively stable.

Description

technical field [0001] The invention belongs to the field of light-emitting materials, and in particular relates to a silicon dioxide-coated red-green perovskite quantum dot stabilized fluorescent powder and a preparation method thereof, which can be used in the light-emitting center of LEDs. Background technique [0002] Quantum dots, or nanocrystals. It is a semiconductor nanoparticle with a particle size of 2-20nm. Traditional quantum dots are usually composed of II-VI group elements or III-V group elements. The emission spectrum is narrow, the fluorescence efficiency is high, and due to the quantum confinement effect at the nanometer scale, the emission spectrum can be adjusted according to the size and many other advantages. In recent years, due to the CsPbX 3 Due to the excellent performance and extensive research of type perovskite materials, the properties and applications of quantum dots have also attracted more and more attention. This kind of quantum dot has t...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/66B82Y20/00B82Y30/00B82Y40/00
CPCC09K11/025C09K11/665B82Y20/00B82Y30/00B82Y40/00
Inventor 金盛烨王事平何胜
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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