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Method for synthesizing silica-coated organic-inorganic perovskite structure quantum dots and the application of the synthesized quantum dots

A technology for synthesizing silicon dioxide and silicon dioxide, which is applied in the direction of chemical instruments and methods, adhesive types, adhesive additives, etc., can solve the problems of high efficiency, stability, poor solution processing performance, and decreased luminous efficiency. Achieve the effects of good solution processing performance, enhanced air and thermal stability, and low production cost

Inactive Publication Date: 2020-03-06
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, there have been many attempts to coat silica, such as coating by tetramethoxysilane post-treatment, but this method usually obtains particles with a particle size of several hundred nanometers; Grow perovskite quantum dots to improve stability and obtain quantum dots with specific structures, but the particles obtained by this method are usually large and cannot be dispersed into the solution, and the solution processing performance is poor; such as obtained by adding silicon-containing ligands Quantum dots, but this method generally obtains quantum dot solid powder, and the solution processing performance is poor
At the same time, the silicon-containing ligands are easily hydrolyzed in the precursor solution, resulting in a serious decrease in luminous efficiency.
[0005] The prior art has not achieved efficient, stable, solution-processable silica-coated organic-inorganic perovskite quantum dots

Method used

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  • Method for synthesizing silica-coated organic-inorganic perovskite structure quantum dots and the application of the synthesized quantum dots
  • Method for synthesizing silica-coated organic-inorganic perovskite structure quantum dots and the application of the synthesized quantum dots
  • Method for synthesizing silica-coated organic-inorganic perovskite structure quantum dots and the application of the synthesized quantum dots

Examples

Experimental program
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Effect test

Embodiment 1

[0067] combine Figure 1-6 Illustrative Example 1

[0068] Preparation of the silica-coated organic-inorganic perovskite structure green fluorescent quantum dots of the present invention:

[0069] Step 1, take 0.088mmol methyl ammonium bromide, 0.072mmol lead bromide, dissolve in 1mL DMF, obtain the first solution;

[0070] Step 2. Dissolve 0.1 mL of 3-aminopropyltriethoxysilane and 1 mL of oleic acid in 1 mL of toluene to obtain a second solution;

[0071] Step 3. Mix 0.1mL of the first solution with 0.017mL of the second solution, quickly inject into 2mL of toluene and stir vigorously;

[0072] Step 4. Centrifuge the mixed solution obtained in step 3 at 12,000 rpm for 10 min, discard the supernatant, wash with a small amount of toluene, and redisperse in 2 mL of toluene to obtain a silica-coated organic-inorganic perovskite structure Quantum dot solution;

[0073] After washing with toluene, the residual toluene is volatilized in the air to obtain the silicon dioxide-coa...

Embodiment 2

[0081] combine Figure 7-9 Illustrative Example 2

[0082] Preparation of the silica-coated organic-inorganic perovskite structure red fluorescent quantum dots of the present invention:

[0083] Step 1, take 0.088mmol methyl ammonium bromide, 0.072mmol lead bromide, dissolve in 1mL DMF, obtain the first solution 1;

[0084] Step 2, take 0.088mmol methylammonium iodide, 0.072mmol lead iodide, dissolve in 1mL DMF, obtain the first solution 2;

[0085] Step 3. Dissolve 0.1 mL of 3-aminopropyltriethoxysilane and 1 mL of oleic acid in 1 mL of toluene to obtain a second solution;

[0086] Step 4. Mix 0.03mL of the first solution 1, 0.1mL of the first solution 2 and 0.06mL of the second solution, quickly inject into 2mL of toluene and stir vigorously;

[0087] Step 5. Centrifuge the mixed solution obtained in step 4 at 12,000 rpm for 10 minutes, discard the supernatant, wash with a small amount of toluene, and redisperse in 2 mL of toluene to obtain a silica-coated organic-inorgan...

Embodiment 3

[0094] combine Figure 10 , 11 Illustrative Example 3

[0095] Application of silicon dioxide-coated organic-inorganic perovskite structure quantum dots synthesized by the method of the present invention in the preparation of white light-emitting diodes

[0096] Step 1, get 200mg polystyrene particles, be dissolved in the toluene solution, obtain the toluene solution of polystyrene; Get the green fluorescent quantum dot solution 1mL in the embodiment 1 and join in the toluene solution of above-mentioned polystyrene, stir to make it Mix evenly to prepare the first fluorescent glue;

[0097] Step 2, get 200mg polystyrene particles, be dissolved in the toluene solution, obtain the toluene solution of polystyrene; Get the red fluorescent quantum dot solution 1mL in the embodiment 2 and join in the toluene solution of above-mentioned polystyrene, stir to make it Mix evenly to prepare the second fluorescent glue;

[0098] Step 3. Mix the first fluorescent glue obtained in step 1...

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Abstract

The invention relates to a method for synthesizing silicon dioxide-coated organic-inorganic perovskite structure quantum dots and the application of the synthesized quantum dots, belonging to the field of nanomaterial science. The method comprises the following steps: using methylammonium halide and lead halide as raw materials, oleic acid and amino-containing silane coupling agent as ligands, and synthesizing stable, efficient and solution-processable silica in one step at room temperature through a solution method Coated organic-inorganic perovskite structure quantum dots. The method of the invention greatly increases the stability of the quantum dots through the coating of silicon dioxide, and at the same time ensures the high fluorescence quantum efficiency of the quantum dots, which can reach up to 95%. At the same time, the quantum dots prepared by the method can be dispersed in solvents such as toluene to form a stable solution. Mixing quantum dot solution with polystyrene toluene solution can be used to prepare warm white light-emitting diodes. The prepared white light-emitting diodes have color coordinates (0.38,0.43) and a color temperature of 4500K, which can be applied to information storage, information encryption, anti-counterfeiting, and lighting display and other fields.

Description

technical field [0001] The invention belongs to the field of nanometer material science, and specifically relates to a method for synthesizing silicon dioxide-coated organic-inorganic perovskite structure quantum dots by using an improved room temperature one-step method and an application of the synthesized quantum dots. Background technique [0002] In the past three decades, colloidal semiconductor quantum dots have been widely used in biological imaging, photocatalysis, solar cells, light-emitting diodes, photodetectors and other fields due to their unique photoelectric properties. However, the commonly used cadmium-based quantum dots are limited in their application due to their high toxicity and complex synthesis process. In recent years, a new type of quantum dot with perovskite structure has attracted people's attention due to its high quantum efficiency, narrow emission spectrum, continuously adjustable emission wavelength with the change of composition, and simple ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/06B82Y20/00B82Y30/00B82Y40/00C09J125/06C09J11/04H01L33/50
CPCB82Y20/00B82Y30/00B82Y40/00C08K9/10C09J11/04C09J125/06C09K11/06H01L33/502H01L33/505Y02B20/00
Inventor 范翊刘哲钦郭晓阳吕营刘星元
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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