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Ultra-small perovskite quantum dots and preparation method thereof

A perovskite and quantum dot technology, applied in chemical instruments and methods, final product manufacturing, sustainable manufacturing/processing, etc., can solve the problems of difficult size control and easy agglomeration, and achieve easy size control, difficult to agglomerate, and simplification. The effect of the synthesis process

Active Publication Date: 2020-01-14
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an ultra-small quantum dot that is uniform, orderly, small in size, simple in preparation method, and easy to expand production in order to overcome the defects of difficult control of size and easy agglomeration in the process of preparing perovskite quantum dots existing in the above-mentioned prior art. Perovskite quantum dots and preparation method thereof

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  • Ultra-small perovskite quantum dots and preparation method thereof
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  • Ultra-small perovskite quantum dots and preparation method thereof

Examples

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Embodiment 1

[0035] A preparation method of ultra-small perovskite quantum dots, comprising the following steps:

[0036] (1) Weigh 0.105g of cesium bromide and 0.138g of lead bromide solid powder and dissolve them in a beaker with 10ml of ethanol, stir for 30min to dissolve them, and keep warm at 40°C for 30min to obtain the reactant precursor solution for later use;

[0037] (2) Disperse 9.235 mg of mesoporous silica powder in a chloroform solution containing 1 ml of oleylamine and 1 ml of oleic acid and stir for 30 min, then place the mesoporous silica suspension in ice water for later use, wherein the concentration of mesoporous silica is 1.85×10 -3 g / ml;

[0038] (3) Take 1ml of the above precursor solution and quickly inject it into 5ml of mesoporous silica suspension, keep stirring for 5min, and obtain perovskite quantum dots dispersed in mesoporous silica through repeated washing, centrifugation, dispersion and other processes.

[0039] The mesoporous silica used in the preparati...

Embodiment 2

[0042] A preparation method of ultra-small perovskite quantum dots, comprising the following steps:

[0043] (1) Weigh 0.105g of cesium bromide and 0.138g of lead bromide solid powder and dissolve them in a 10ml ethanol beaker, stir for 30min to dissolve them, and keep warm at 50°C for 30min to obtain the reactant precursor solution for later use;

[0044] (2) Disperse 18.47mg of mesoporous silica powder in a chloroform solution containing 1ml of oleylamine and 1ml of oleic acid and stir for 30min, then place the mesoporous silica suspension in ice water for later use, wherein the concentration of mesoporous silica is 2.31×10 -3 g / ml;

[0045] (3) Take 1ml of the above precursor solution and quickly inject it into 8ml of mesoporous silica suspension, continue to stir for 8min, and obtain perovskite quantum dots dispersed in mesoporous silica through repeated washing, centrifugation, dispersion and other processes.

[0046] The mesoporous silica used in the preparation proces...

Embodiment 3

[0049] A preparation method of ultra-small perovskite quantum dots, comprising the following steps:

[0050] (1) Weigh 0.105g of cesium bromide and 0.138g of lead bromide solid powder and dissolve them in a 10ml ethanol beaker, stir for 30min to dissolve them, and keep warm at 60°C for 30min to obtain the reactant precursor solution for later use;

[0051] (2) Disperse 92.35 mg of mesoporous silica powder in a chloroform solution containing 1 ml of oleylamine and 1 ml of oleic acid and stir for 30 min, then place the mesoporous silica suspension in ice water for later use, wherein the concentration of mesoporous silica is 9.23×10 -3 g / ml;

[0052] (3) Take 1ml of the above precursor solution and quickly inject it into 10ml of mesoporous silica suspension, keep stirring for 10min, and obtain perovskite quantum dots dispersed in mesoporous silica through repeated washing, centrifugation, dispersion and other processes.

[0053] The mesoporous silica used in the preparation pro...

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Abstract

The invention relates to a preparation method of ultra-small perovskite quantum dots, which comprises the following steps: weighing solid powders of lead bromide and cesium bromide respectively, dissolving them in ethanol solution, and performing heat preservation treatment to obtain reactant precursor solution; dispersing mesoporous silica in chloroform solution containing oleylamine and oleic acid, stirring, and placing the obtained mesoporous silica suspension in an ice water bath for later use; adding the reactant precursor solution into the mesoporous silica suspension, reacting and crystallizing under stirring conditions, then separating and washing the solids in the mixed liquid to obtain the ultra-small perovskite quantum dots. Compared with the prior art, the prepared ultra-smallquantum dot has the advantages of stable, orderly and controllable growth, has excellent chemical and optical stability, and has good application prospect on LED devices.

Description

technical field [0001] The invention relates to the field of cesium-lead-halide nano-luminescent materials, in particular to an ultra-small perovskite quantum dot and a preparation method thereof. Background technique [0002] In recent years, as a new member of the perovskite family—all-inorganic perovskite quantum dots (CsPbX 3 ) has attracted more and more attention from researchers because of its advantages such as very narrow luminescence peak, high quantum efficiency, good stability, simple preparation process, and adjustable color. Through the unremitting efforts of scientific researchers, all-inorganic perovskite quantum dots have been realized in various applications such as solar cells, light-emitting diodes (LEDs), white light LEDs (WLEDs) and lasers. Due to the advantages of easy synthesis, low cost, high absorption coefficient, and long carrier diffusion distance, perovskite materials have set off a research boom in the field of photovoltaics and become a hot "...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/66B82Y20/00B82Y40/00
CPCC09K11/665B82Y20/00B82Y40/00Y02P70/50
Inventor 房永征陈鹏刘玉峰房诗玉杨永阁侯京山张娜赵国营
Owner SHANGHAI INST OF TECH
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