Method for preparing halide perovskite caesium lead bromide quantum dot based on liquid-phase laser irradiation

A technology of laser irradiation and lead-bromine quantum, which is applied in chemical instruments and methods, luminescent materials, nano-optics, etc., to achieve the effects of less restrictions, simple synthesis steps, and high repeatability

Active Publication Date: 2018-11-09
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is no report on the preparation method of all-inorganic halogen per...

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  • Method for preparing halide perovskite caesium lead bromide quantum dot based on liquid-phase laser irradiation
  • Method for preparing halide perovskite caesium lead bromide quantum dot based on liquid-phase laser irradiation
  • Method for preparing halide perovskite caesium lead bromide quantum dot based on liquid-phase laser irradiation

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Embodiment 1

[0031] Cesium-lead-bromine quantum dots with single-phase structure, good crystallinity, and uniform and controllable morphology were prepared under mild conditions by using liquid-phase laser irradiation on cesium-lead-bromine powder immersed in the solution. Specifically include the following steps:

[0032] Step 1. Add 0.012g cesium lead bromide powder, 30mL toluene, 100μL oleylamine and 100μL oleic acid to a long glass test tube, place the long glass test tube vertically, and stir the solution evenly with a magnetic stirrer;

[0033] Step 2. Adjust the optical path of the laser so that the pulsed laser beam is parallel to the long test tube, incident at the center of the test tube mouth, and irradiated to the center of the liquid surface. Using a laser wavelength of 532nm, energy of 400mJ and frequency of 10Hz, the solution was irradiated for 40min.

[0034] Step 3. After the irradiation is completed, the solution is transferred to a centrifuge tube and centrifuged at 800...

Embodiment 2

[0038] Cesium-lead-bromine quantum dots with single-phase structure, good crystallinity, and uniform and controllable morphology were prepared under mild conditions by using liquid-phase laser irradiation on cesium-lead-bromine powder immersed in the solution. Specifically include the following steps:

[0039] Step 1. Add 0.012g cesium lead bromide powder, 30mL toluene, and 100μL oleylamine into the long glass test tube, place the long glass test tube vertically, and stir the solution evenly with a magnetic stirrer;

[0040]Step 2. Adjust the optical path of the laser so that the pulsed laser beam is parallel to the long test tube, incident at the center of the test tube mouth, and irradiated to the center of the liquid surface. Using a laser wavelength of 532nm, energy of 200mJ and frequency of 10Hz, the solution was irradiated for 30min.

[0041] Step 3. After the irradiation is completed, transfer the solution to a centrifuge tube for centrifugation at 10,000 rpm, and take...

Embodiment 3

[0045] Cesium-lead-bromine quantum dots with single-phase structure, good crystallinity, and uniform and controllable morphology were prepared under mild conditions by using liquid-phase laser irradiation on cesium-lead-bromine powder immersed in the solution. Specifically include the following steps:

[0046] Step 1. Add 0.048g cesium lead bromide powder, 10mL toluene, 100μL oleylamine and 50μL oleic acid into a long glass test tube, place the long glass test tube vertically, and stir the solution evenly with a magnetic stirrer;

[0047] Step 2. Adjust the optical path of the laser so that the pulsed laser beam is parallel to the long test tube, incident at the center of the test tube mouth, and irradiated to the center of the liquid surface. Using a laser wavelength of 532nm, energy of 300mJ and frequency of 10Hz, the solution was irradiated for 10min.

[0048] Step 3. After the irradiation is completed, the solution is transferred to a centrifuge tube and centrifuged at 90...

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Abstract

The invention discloses a method for preparing a halide perovskite caesium lead bromide quantum dot based on liquid-phase laser irradiation. All-inorganic halide perovskite is a novel fluorescent nanomaterial with relatively low toxicity, low cost and high quality, and has good application prospects in the fields of illumination, display, communication, sensing, biological imaging and detection, etc. The method of the invention adopts liquid-phase laser irradiation, uses caesium lead bromide powder as a raw material and oleylamine and oleic acid as ligands, and synthesizes the caesium lead bromide quantum dot with a single-phase structure, good crystallinity and uniform morphology and size in an organic solvent. Compared with conventional preparation methods for caesium lead bromide nano-materials, the method in the invention has the advantages of wide sources of raw materials, simple operation, mild experimental conditions, no need for heating and protective gases, high reproducibility, etc.

Description

technical field [0001] The invention relates to the technical field of preparation of all-inorganic halogen perovskite, in particular to a preparation method based on liquid-phase laser irradiation of halogen perovskite cesium-lead-bromine quantum dots. Background technique [0002] Semiconductor fluorescent materials are widely used in both military and civilian fields such as lighting, display, communication, sensing, and biological imaging. In recent years, with the advent of new perovskite solar cells, a new type of semiconductor material, all-inorganic halogen perovskite, has become a research hotspot in the field of materials science. It has been reported that this material has excellent luminescent properties, and at the same time can achieve full-band coverage of visible light through the regulation of halogen ions, and is expected to become the core material in the next generation of LEDs. [0003] At present, there have been many reports on the synthesis methods o...

Claims

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Application Information

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IPC IPC(8): C09K11/66B82Y40/00B82Y20/00
CPCB82Y20/00B82Y40/00C09K11/665
Inventor 邹友生董宇航曾海波韩泽尧李举彬
Owner NANJING UNIV OF SCI & TECH
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