Room-temperature synthetic method of ultra pure inorganic halogen perovskite blue light nanosheet

A room temperature synthesis, perovskite technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of low luminous efficiency of perovskite blue light nanocrystals, impure chromatogram, small quantum yield, etc., to make up for the luminous efficiency Low instability, excellent luminous performance, easy and efficient operation

Inactive Publication Date: 2018-08-03
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, perovskite blue light nanocrystals have low luminous efficiency, and most of them are sky blue (475nm-500nm) or blue-purple (400nm-450nm), half maximum width is greater than 20nm, chromatographically impure, and quantum yield is less than 60 %, and it is very unstable in the atmospheric environment. The highest efficiency of LED devices based on perovskite blue nanocrystals is only 2.6%, which is far lower than perovskite green and red quantum dot LEDs, which restricts the development of perovskite materials. practical application space

Method used

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  • Room-temperature synthetic method of ultra pure inorganic halogen perovskite blue light nanosheet
  • Room-temperature synthetic method of ultra pure inorganic halogen perovskite blue light nanosheet
  • Room-temperature synthetic method of ultra pure inorganic halogen perovskite blue light nanosheet

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Embodiment 1

[0022] Take by weighing 367 milligrams of lead bromide and dissolve in 2 milliliters of dimethyl sulfoxide (DMSO), configure the precursor of lead bromide, weigh 212 milligrams of cesium bromide and dissolve it in 1 milliliter of hydrobromic acid of 40% weight ratio by weight In the solution, a precursor of cesium bromide is configured. Measure 5 ml of toluene, 0.5 ml of oleylamine, and 0.5 ml of oleic acid and stir at 1000 r / min for 1 minute. Inject 100 microliters of the precursor of lead bromide into the above toluene solution, inject 100 microliters of the precursor of cesium bromide after 1 minute, and then inject 0.5 milliliter of butanol after 1 minute. After reacting for one minute, the solution was centrifuged at 8000r / min for one minute to collect the supernatant. The prepared perovskite blue light nanosheets have a luminous wavelength of 461 nanometers and a full width at half maximum of 14 nanometers.

Embodiment 2

[0024] Take by weighing 367 milligrams of lead bromide and dissolve in 2 milliliters of dimethylsulfoxide (DMSO), configure the precursor of lead bromide, weigh 212 milligrams of cesium bromide and dissolve it in 1 milliliter of 40% by weight hydrobromic acid solution , configure the precursor of cesium bromide. Measure 5 ml of toluene, 0.5 ml of oleylamine, and 0.5 ml of oleic acid and stir at 1000 r / min for 1 minute. Inject 100 microliters of the precursor of lead bromide into the above-mentioned toluene solution, inject 100 microliters of the precursor of cesium bromide after 1 minute, and then inject 0.5 milliliter of butanol after 1 minute. After reacting for one minute, the solution was centrifuged at 8000r / min for 1 minute, and after collecting the supernatant, the supernatant was quickly annealed in a 100-watt microwave for 2 minutes. After the solution was centrifuged at 8000r / min for 4 minutes, the precipitate was collected and dispersed in 2 ml of toluene. The pre...

Embodiment 3

[0026] Take by weighing 367 milligrams of lead bromide and dissolve in 2 milliliters of dimethylsulfoxide (DMSO), configure the precursor of lead bromide, weigh 212 milligrams of cesium bromide and dissolve it in 1 milliliter of 40% by weight hydrobromic acid solution , configure the precursor of cesium bromide. Measure 5 ml of toluene, 0.5 ml of oleylamine, and 0.5 ml of oleic acid and stir at 1000 r / min for 1 minute. Inject 100 microliters of the precursor of lead bromide into the above-mentioned toluene solution, inject 100 microliters of the precursor of cesium bromide after 1 minute, and then inject 0.5 milliliter of butanol after 1 minute. After reacting for one minute, the solution was centrifuged at 8000r / min for 1 minute, and after collecting the supernatant, the supernatant was quickly annealed in a 100-watt microwave for 2.5 minutes. After the solution was centrifuged at 8000r / min for 4 minutes, the precipitate was collected and dispersed in a toluene solution of 0...

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Abstract

The invention provides a room-temperature synthetic method of an ultra pure inorganic halogen perovskite blue light nanosheet. The method comprises the following steps: 1) preparing mixed liquor of oleylamine, oleic acid and toluene; 2) adding a precursor of lead bromide in the mixed liquor after the reaction in the step 1) is completed, uniformly stirring the materials, and adding a precursor ofcesium bromide; taking the precursor of lead bromide as a solvent of dimethyl sulfoxide; taking a hydrobromic acid solution with 40% weight ratio of the precursor of cesium bromide as a solvent; 3) injecting a butanol solution in the mixed liquor after the reaction in the step 2) is completed, fully reacting the materials, and performing centrifugation collection to obtain a supernatant; and 4) performing microwave heating on the supernatant and performing re-centrifugation, and depositing and dispersing the centrifuged precipitate at a ground floor in a toluene solution. The method has the advantages of simple operation and high efficiency, the luminescence property of the ultra pure inorganic halogen perovskite blue light nanosheet is excellent, and the shortage of the low luminescence efficiency and non stabilization of an inorganic halogen perovskite blue light nano-material in the prior art can be effectively made up.

Description

technical field [0001] The invention belongs to the field of optoelectronic material preparation, and in particular relates to a method for synthesizing ultrapure inorganic halogen perovskite blue light nanosheets at room temperature. Background technique [0002] As the most lagging wavelength band in the field of display and lighting, blue light greatly limits the application of blue light and white light LEDs, and short-wavelength blue light (400-450 nanometers) is extremely harmful to the retina of the human eye, endangers the health of the fundus, and induces eye diseases. Therefore, the development of efficient long-wavelength blue LED materials has important scientific and practical significance. [0003] Perovskite-type quantum dots or nanoparticles, such as perovskite-type organic lead halide compounds or all-inorganic perovskite-type lead halides, due to their low synthesis cost, high fluorescence efficiency, narrow half-peak width of light emission and wide band g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/66
CPCC09K11/665
Inventor 曾书玉李晓明吴晔仇双晨李月磊
Owner NANJING UNIV OF SCI & TECH
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