Preparation method of formamidinium bromide perovskite quantum dots with controllable size

A technology of amidine bromide-based perovskite and quantum dots, which is applied in the field of quantum dot material preparation, can solve the problems of low preparation efficiency, long preparation time of solid-phase method, complicated operation, etc., and achieve low preparation equipment requirements, low raw material prices, The effect of the simple preparation process

Active Publication Date: 2021-04-23
NORTHWEST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the thermal injection method has poor dispersibility and stability, and is prone to coagulation reaction; t...

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  • Preparation method of formamidinium bromide perovskite quantum dots with controllable size
  • Preparation method of formamidinium bromide perovskite quantum dots with controllable size
  • Preparation method of formamidinium bromide perovskite quantum dots with controllable size

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Embodiment 1

[0029] Measured 0.1 mmol of formamidine acetate, 0.1 mmol of lead bromide, 10 uL of hydrogen bromide, 0.1 mmol of oleic acid and 0.1 mmol of oleylamine were mixed in a test tube, and the mixture was completely dissolved in 5 ml of dimethylformamide , to prepare a perovskite precursor; inject the precursor into a vigorously stirred toluene solution to obtain a mixed solution; centrifuge the mixed solution in a centrifuge tube at 6000 rpm for 5 minutes to remove residual precursors and large products, take out the supernatant, and then Centrifuge at 12000rpm for 5min, then take out the supernatant, and disperse the precipitate in toluene to obtain FAPbBr 3 Mineral Quantum Dots.

[0030] The resulting FAPbBr 3 The photo of quantum dot suspension under ultraviolet light is as follows: figure 1 As shown in the left 1, the quantum dot solution emits brighter green fluorescence, indicating that high-quality quantum dots are prepared with high quality; its XRD is as follows figure...

Embodiment 2

[0032] Measured 0.1 mmol of formamidine acetate, 0.1 mmol of lead bromide, 10 uL of hydrogen bromide, 0.1 mmol of oleic acid and 0.1 mmol of oleylamine were mixed in a test tube, and the mixture was completely dissolved in 5 ml of dimethylformamide , to prepare a perovskite precursor; mix the precursor with an additional 3 uL hydrogen bromide additive in a beaker, and inject them into a vigorously stirred toluene solution to obtain a mixed solution; centrifuge the mixed solution in a centrifuge tube at 6000rpm for 5min , remove residual precursors and large products, take out the supernatant, and then centrifuge at 12000rpm for 5min, then take out the supernatant, and disperse the precipitate in toluene to obtain formamidine bromide perovskite quantum dots.

[0033] The resulting FAPbBr 3 The photo of the quantum dot suspension under the irradiation of ultraviolet light is as follows: figure 1 As shown in the second from the left, the solution emits brighter fluorescence, and...

Embodiment 3

[0035] Measured 0.1 mmol of formamidine acetate, 0.1 mmol of lead bromide, 10 uL of hydrogen bromide, 0.1 mmol of oleic acid and 0.1 mmol of oleylamine were mixed in a test tube, and the mixture was completely dissolved in 5 ml of dimethylformamide , to prepare a perovskite precursor; put the precursor and 6 uL of hydrogen bromide additive in a beaker and mix them, and inject them into the vigorously stirred toluene solution to obtain a mixed solution; centrifuge the mixed solution in a centrifuge tube at 6000rpm for 5min, Remove residual precursors and large products, take out the supernatant, and then centrifuge at 12,000 rpm for 5 minutes, then take out the supernatant, and disperse the precipitate in toluene to obtain formamidine bromide perovskite quantum dots with controllable size.

[0036] The resulting FAPbBr 3 The photo of the quantum dot suspension under the irradiation of ultraviolet light is as follows: figure 1 As shown in the third from the left, the quantum do...

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Abstract

The invention relates to a preparation method of formamidinium bromide perovskite quantum dots with controllable size. The preparation method comprises the following steps: 1) completely dissolving a certain amount of formamidine acetate, lead bromide, hydrogen bromide, oleic acid and oleylamine in dimethylformamide to prepare a perovskite precursor; 2) injecting the precursor and different amounts of hydrogen bromide solutions into toluene to obtain a mixed solution; 3) centrifuging the mixed solution in a centrifuge tube to remove impurities to obtain formamidinium bromide perovskite quantum dots; and 4) dispersing the product in toluene to obtain the formamidinium bromide perovskite quantum dots with controllable size. The method has the advantages that the raw materials are cheap and easy to obtain, required equipment is simple, popularization is easy, and the size of the quantum dots can be adjusted by adding the amount of HBr. The quantum dots are suitable for the technical field of quantum dot material controllable preparation.

Description

technical field [0001] The invention belongs to the technical field of preparation of quantum dot materials, and in particular relates to a preparation method of size-controllable formamidine bromide perovskite quantum dots. Background technique [0002] In recent years, halogen perovskite APbX 3 (A = MA + ,FA + , Cs + ; X = Cl - , Br - , I - ) Nanocrystals have attracted widespread attention because of their excellent photoelectric properties, which have high light absorption coefficient, long carrier diffusion length, photoluminescence spectrum covering the entire visible light, and extremely high quantum yield. These outstanding properties make perovskite nanocrystals promising candidates for next-generation optoelectronic devices such as light-emitting diodes, lasers, and photodetectors with great application potential. [0003] In perovskite nanocrystals, formamidine bromide (FAPbBr 3 ) perovskite has higher thermal and chemical resistance, in addition, FAPbBr ...

Claims

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Application Information

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IPC IPC(8): C07C257/12C09K11/06C09K11/66B82Y30/00B82Y40/00
CPCC07C257/12C09K11/06C09K11/664B82Y30/00B82Y40/00Y02E10/549
Inventor 曲瑞丁聪齐晓斐刘成赵武闫军锋张志勇
Owner NORTHWEST UNIV
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