Zero-dimensional perovskite nanocrystalline material with tunable light-emitting wavelength, and preparation method and light-emitting wavelength regulation and control method thereof

A nanocrystalline material, zero-dimensional perovskite technology, applied in luminescent materials, chemical instruments and methods, lead compounds, etc., can solve problems such as infeasibility, and achieve the effects of low cost and simple control methods

Active Publication Date: 2021-10-01
QILU UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But since the zero-dimensional perovskite Cs 4 PbBr 6 The strong quantum confinement effect brought about by its own high exciton binding energy makes it unfeasible to use the quantum size effect to adjust the optical band gap and then adjust the luminescence
In addition, due to the current zero-dimensional perovskite Cs 4 PbBr 6 The mechanism of luminescence is still unclear, so it is not feasible to adjust the luminescence wavelength by anion exchange

Method used

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  • Zero-dimensional perovskite nanocrystalline material with tunable light-emitting wavelength, and preparation method and light-emitting wavelength regulation and control method thereof
  • Zero-dimensional perovskite nanocrystalline material with tunable light-emitting wavelength, and preparation method and light-emitting wavelength regulation and control method thereof
  • Zero-dimensional perovskite nanocrystalline material with tunable light-emitting wavelength, and preparation method and light-emitting wavelength regulation and control method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A method for preparing a zero-dimensional perovskite nanocrystal material with tunable emission wavelength, comprising the steps of:

[0041] Add 3.640 g of CTAB to 20 ml of DMSO solution to prepare a CTAB-DMSO precursor solution with a concentration of 500 mM, and prepare two copies of the above. Then add 0.02394g of CsBr and 0.0918g of PbBr to the above precursor solution respectively 2 Prepare 20ml 0.056M CsBr-CTAB-DMSO solution and 20ml 0.0125M PbBr 2 - CTAB-DMSO solution. Then 15ml 0.056M CsBr-CTAB-DMSO solution and 15ml 0.0125M PbBr 2 - CTAB-DMSO solution was injected into a long-necked flask placed in a water bath, then 1ml of anti-solvent dichloromethane solution was added, and the reaction was magnetically stirred at 45°C for 24h; then 10ml of dichloromethane was added to generate Cs 4 PbBr 6 Nanocrystalline precipitation. The obtained Cs was washed repeatedly with dichloromethane solution 4 PbBr 6 Nanocrystals, stored in isopropanol.

Embodiment 2

[0043] A method for preparing a zero-dimensional perovskite nanocrystal material with tunable emission wavelength, comprising the steps of:

[0044] Add 2.970g of CTAB to 20ml of DMSO solution to prepare a CTAB-DMSO precursor solution with a concentration of 400mM, and prepare two copies of the above; then add 0.02394g of CsBr and 0.0918g of PbBr to the above precursor solution respectively 2 Prepare 20ml 0.056M CsBr-CTAB-DMSO solution and 20ml 0.0125M PbBr 2 - CTAB-DMSO solution. Then 15ml 0.056M CsBr-CTAB-DMSO solution and 15ml 0.0125M PbBr 2 - CTAB-DMSO solution is injected into a long-necked flask placed in a water bath, then 1ml of anti-solvent dichloromethane solution is added, and the reaction time is 24 hours under magnetic stirring at 45°C; then 10ml of dichloromethane solution is added to generate Cs 4 PbBr 6 Nanocrystalline precipitation. The obtained Cs was washed repeatedly with dichloromethane solution 4 PbBr 6 Nanocrystals, stored in isopropanol.

Embodiment 3

[0046] A method for preparing a zero-dimensional perovskite nanocrystal material with tunable emission wavelength, comprising the steps of:

[0047] 1.458 g of CTAB was added to 20 ml of DMSO solution to prepare a CTAB-DMSO precursor solution with a concentration of 200 mM, and the above preparation was performed in duplicate. Then add 0.02394g of CsBr and 0.0918g of PbBr to the above precursor solution respectively 2 Prepare 20ml 0.056M CsBr-CTAB-DMSO solution and 20ml 0.0125M PbBr 2 - CTAB-DMSO solution. Then 15ml 0.056M CsBr-CTAB-DMSO solution and 15ml 0.0125M PbBr 2 - CTAB-DMSO solution was injected into a long-necked flask placed in a water bath, then 1ml of anti-solvent dichloromethane solution was added, and the reaction was magnetically stirred at 45°C for 24h; then 10ml of dichloromethane solution was added to generate Cs 4 PbBr 6 Nanocrystalline precipitation. The obtained Cs was washed repeatedly with dichloromethane solution 4 PbBr 6 Nanocrystals, stored in ...

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Abstract

The invention provides a zero-dimensional perovskite nanocrystalline material with tunable light-emitting wavelength, and a preparation method and a light-emitting wavelength regulation and control method thereof. The preparation method comprises the steps: mixing CTAB and DMSO to obtain a precursor solution; respectively dissolving CsBr and PbBr2 in a precursor solution, so as to obtain a CsBr-CTAB-DMSO solution and a PbBr2-CTAB-DMSO solution; mixing the two solutions, and adding an anti-solvent dichloromethane, to obtain a mixed solution, wherein the ratio of the total mole of CsBr and PbBr2 in the mixed solution to the mole of CTAB is (0.0685-17):1; reacting for 12-24 hours at the temperature of 40-70 DEG C under a stirring condition; and crystallizing, washing and drying to obtain the zero-dimensional perovskite nanocrystalline material. The preparation and regulation and control methods are simple and low in cost; and the light-emitting wavelength of the prepared nanocrystalline material is continuously regulated and controlled from 450 nm to 517 nm.

Description

technical field [0001] The invention relates to a zero-dimensional perovskite nanocrystal material with tunable emission wavelength, a preparation method thereof and a method for regulating the emission wavelength, and belongs to the technical field of photoelectric materials. Background technique [0002] Metal halide perovskite materials have excellent photoelectric response characteristics, and have received extensive research attention in recent years. So far, they have been widely used in photovoltaics, displays, solar cells, lasers and other fields. [0003] At present, most of the domestic and foreign research focuses on perovskite materials with structural units arranged periodically in three dimensions (referred to as three-dimensional perovskites), but the thin film morphology or bulk materials of three-dimensional perovskite materials usually have serious problems. The phenomenon of fluorescence quenching affects its further application. In recent years, it has b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/66C01G21/00
CPCC09K11/665C01G21/006C01P2002/72C01P2004/03C01P2004/62
Inventor 孟宪赓石信民张炜光孙逊
Owner QILU UNIV OF TECH
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