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Preparation method and application of white light and blue-green-yellow light non-lead perovskite nanocrystalline phosphors

A yellow light, nanocrystalline technology, applied in nano-optics, nanotechnology, nanotechnology and other directions, can solve the problems of strong pollution of drinking water, high toxicity, limited application of perovskite materials, etc., to achieve low equipment and raw material costs, toxicity Low, X-ray correspondingly sensitive effect

Active Publication Date: 2022-08-05
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used antisolvents are mainly dichloromethane (DCM), toluene, chlorobenzene (CB), etc., which are recognized as strong pollution to drinking water and show high toxicity
This severely limits the wider application of perovskite materials in the future.

Method used

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  • Preparation method and application of white light and blue-green-yellow light non-lead perovskite nanocrystalline phosphors
  • Preparation method and application of white light and blue-green-yellow light non-lead perovskite nanocrystalline phosphors
  • Preparation method and application of white light and blue-green-yellow light non-lead perovskite nanocrystalline phosphors

Examples

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Embodiment 1

[0040] The invention provides a method for preparing Cs in an ambient atmosphere by using ethanol as an extractant 3 Cu 2 I 5 Methods for Perovskite Nanocrystalline Fluorescent Powders. The method specifically includes: fully dissolving CsI and CuI in a DMSO solution at a molar ratio of 3:2, suction filtration to obtain a clear precursor solution, injecting the above-mentioned clear precursor solution into anhydrous ethanol reagent, and centrifuging to remove the supernatant solution, the Cs can be obtained 3 Cu 2 I 5 Nanocrystalline fluorescent powder.

[0041]The method specifically includes the following steps:

[0042] 1. Combine CsI (0.3 mmol), CuI (0.2 mmol), DMSO (10 mL) in a small glass vial.

[0043] 2. Heat the small glass bottle in step (1) to 60°C in a water bath, and stir vigorously with a magnet for 30 minutes to fully dissolve CsI and CuI to form Cs 3 Cu 2 I 5 the precursor solution.

[0044] 3. Put the solution prepared in step (2) on the conical fla...

Embodiment 2

[0054] The invention provides a method for preparing Cs in an ambient atmosphere by using ethanol as an extractant 3 Cu 2 Br 5 Methods for Perovskite Nanocrystalline Fluorescent Powders. The method specifically includes: fully dissolving CsBr and CuBr in a DMSO solution at a molar ratio of 3:2, suction filtration to obtain a clear precursor solution, injecting the above-mentioned clear precursor solution into anhydrous ethanol reagent, and centrifuging to remove the supernatant solution, the Cs can be obtained 3 Cu 2 Br 5 Nanocrystalline fluorescent powder.

[0055] The method specifically includes the following steps:

[0056] 1. Combine CsBr (0.15 mmol), CuBr (0.1 mmol), DMSO (10 mL) in a small glass vial.

[0057] 2. Heat the above-mentioned small glass bottle to 60°C in a water bath, stir vigorously with a magnet for 30 minutes to fully dissolve CsBr and CuBr to form Cs 3 Cu 2 Br 5 the precursor solution.

[0058] 3. Put the solution prepared in step (2) on the ...

Embodiment 3

[0063] The invention provides a method for preparing Cs in an ambient atmosphere by using ethanol as an extractant 3 Cu 2 Cl 5 Methods for Perovskite Nanocrystalline Fluorescent Powders. The method specifically includes: fully dissolving CsCl and CuCl in 10 ml of a mixed reagent with a volume ratio of DMF:DMSO of 3:7 at a molar ratio of 3:2, suction filtration to obtain a clear precursor solution, and injecting the above clear precursor solution into In anhydrous ethanol reagent, and centrifuging to remove the supernatant, the Cs can be obtained 3 Cu 2 Cl 5 Nanocrystalline fluorescent powder.

[0064] The method specifically includes the following steps:

[0065] 1. Combine CsCl (0.15 mmol), CuCl (0.1 mmol), DMSO (10 mL) in a small glass vial.

[0066] 2. Heat the above-mentioned small glass bottle to 60°C in a water bath, stir vigorously with a magnet for 30 minutes to fully dissolve CsCl and CuCl to form Cs 3 Cu 2 Cl 5 the precursor solution.

[0067] 3. Put the s...

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Abstract

The invention discloses a preparation method and application of white light and blue-green-yellow light non-lead perovskite nanocrystalline fluorescent powder. The precursor solution is injected into absolute ethanol, centrifugally filtered and dried to obtain CsCu with high purity and excellent performance 2 X 3 or Cs 3 Cu 2 X 5 phosphor. For the first time, by simply adjusting the molar ratio of CsI:CuI, ethanol was used to obtain submicron phosphors that emit white light under ultraviolet light. The invention selects ethanol as the extractant, has no pollution to the environment, has high yield, stable performance, simple process, low cost, is convenient for large-scale industrial production, and the prepared perovskite nanocrystalline phosphor powder has uniform particle size and low dispersion. At the same time, it maintains high crystallinity, less defects, and has higher light yield for electro / photoluminescence and high-energy rays. It paves the way for the large-scale application of perovskite nanocrystalline phosphors in the future optoelectronic fields, such as medical radiography, non-destructive testing, color display screens, and LEDs.

Description

technical field [0001] The invention belongs to the technical field of application of all-inorganic metal halide nanometer materials, and more particularly relates to a preparation method and application of a white light and blue-green-yellow light non-lead perovskite nanocrystalline fluorescent powder. technical background [0002] The application of new solid-state lighting offers great potential for various applications such as white light-emitting diodes (LEDs), photodetectors, etc. A typical white light LED is made of blue InGaN chips coated with yellow phosphors, most of which contain rare earth ions Eu. 2+ , Ce 3+ Or other toxic elements, which eventually lead to the problem of white LED environmental resources and cost and economic problems that are difficult to solve. Therefore, actively exploring a preparation method of green and environment-friendly high-performance white LED phosphors has become an important research topic at present. [0003] In recent years,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/61H01L33/50B82Y30/00B82Y20/00
CPCC09K11/616H01L33/502B82Y20/00B82Y30/00Y02B20/00
Inventor 徐强王冰欧阳晓平
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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