Conjugated ligand-based perovskite quantum dot, and preparation method and application thereof

A quantum dot and perovskite technology, applied in the field of optoelectronic materials, can solve the problems of transmission performance of perovskite quantum dots that are not mentioned, and achieve the effect of large-scale repeatability and improved carrier mobility.

Active Publication Date: 2017-10-20
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Zhang et al. (Vol.9.No.4.4533-4532.2015ACSNANO) used oleylamine and n-octylamine as surfactants and ligands to prepare a series of perovskite quantum dots with adjustable composition, which showed better photoluminescence performance, but it has not been used to complete the preparation of elect

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  • Conjugated ligand-based perovskite quantum dot, and preparation method and application thereof
  • Conjugated ligand-based perovskite quantum dot, and preparation method and application thereof
  • Conjugated ligand-based perovskite quantum dot, and preparation method and application thereof

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preparation example Construction

[0042] There are many ways to prepare the above perovskite quantum dots based on conjugated ligands, one of which is to use the emulsion method to prepare the quantum dots, which specifically includes the following steps:

[0043] 1) Weigh the molar ratio AX:BX 2 Prepare a reactant emulsion for the reactant between 0.5 and 2, and after vigorous stirring, add a demulsifier such as acetone dropwise to the emulsion under the same vigorous stirring condition to obtain an emulsion containing the required quantum dots;

[0044] 2) Evenly divide the emulsion obtained in step 1) into centrifuge tubes, centrifuge at a centrifugal speed of 7000-9000rmp for 5min, and pour off the supernatant;

[0045] 3) Add a non-polar solvent 1 to 2 times the volume of the precipitate to the centrifuge tube from which the supernatant was discarded in step 2), ultrasonically decompose, and then centrifuge at a centrifugal rate of 5000 to 6000rmp for 5 minutes to obtain an emerald green supernatant. sup...

Embodiment 1

[0047] Embodiment 1: methylamine lead bromine quantum dot

[0048] According to a specific embodiment of the perovskite quantum prepared with conjugated molecules as ligands of the present invention, it is based on phenylpropenylamine Preparation of Methylamine PbBr Quantum Dots as Ligands:

[0049] 1) Weigh 0.2mmol PbBr 2 , 0.16 mmol CH 3 NHBr, dissolved in 1ml DMF, and 8ml of n-hexane was added to it, followed by 40ul of amphetamine 0.5ml of oleic acid, after stirring for 3 to 5 hours under electromagnetic stirring, 8ml of demulsifier was added dropwise at a rate of 1-2 drops per second to obtain a yellow-green suspension;

[0050] 2) Evenly divide the suspension obtained in step 1) into two centrifuge tubes, centrifuge at a centrifugal rate of 9000rmp for 5min, and pour off the supernatant;

[0051] 3) Add 1ml of toluene to the centrifuge tube from which the supernatant was discarded in step 2), ultrasonically decompose, and then centrifuge at 6000rmp for 5min to obta...

Embodiment 2

[0056] Embodiment 2: formamidine lead bromine quantum dot

[0057] According to another specific embodiment of the perovskite quantum prepared with conjugated molecules as ligands of the present invention, it is based on phenylpropenylamine Preparation of Formamidine PbBr Quantum Dots as Ligands:

[0058] 1) Weigh 0.2mmol PbBr 2 , 0.16mmol HC (NH 2 ) 2 Br, was dissolved in 1ml DMF, and 8ml of n-hexane was added to it, followed by 40ul of amphetamine 0.5ml of oleic acid, after stirring for 3-5 hours under electromagnetic stirring, add 8ml of demulsifier dropwise at a rate of 1-2 drops per second to obtain a yellow-green suspension

[0059] 2) Evenly divide the suspension obtained in step 1) into two centrifuge tubes, centrifuge at 9000rmp for 5min, and pour off the supernatant

[0060] 3) Add 1ml of toluene to the centrifuge tube from which the supernatant was discarded in step 2), ultrasonically decompose, and then centrifuge at 6000rmp for 5min to obtain an emerald gre...

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Abstract

The invention discloses a conjugated ligand-based perovskite quantum dot, and a preparation method and an application thereof. The perovskite quantum dot comprises an organic conjugated ligand and a perovskite quantum dot main body from outside to inside; the molecule of the organic conjugated ligand is an organic amine molecule having an all-conjugated structure; and the composition of the perovskite quantum dot is ABX3. Electrons in the organic all-conjugated molecule have delocalization characteristics, and the mobility of the electrons in the conjugated system is significantly higher than the mobility of the electron only existing in covalent single-bonded long chain molecules, so the mobility of carriers in a whole perovskite quantum dot luminescence layer is improved, and the improvement of the luminous efficiency is promoted.

Description

technical field [0001] The invention belongs to the technical field of photoelectric materials, and relates to a perovskite quantum dot and its preparation method and application, in particular to a method for preparing a perovskite quantum dot with fully conjugated molecules as ligands and its application. Background technique [0002] Quantum dots are semiconductor nanocrystals with a radius smaller than or close to the exciton Bohr radius, and are generally small particles of 1-10 nm in appearance. The size of quantum dots in the three-dimensional direction is very small, which limits the transport properties of electrons in quantum dots, showing a strong quantum confinement effect, so that the energy band structure in quantum dots and the bulk material very different. It is precisely because of this difference in energy band structure and the adjustability of the energy band structure with size that quantum dot materials have significant advantages in the field of optoe...

Claims

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Application Information

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IPC IPC(8): C09K11/06C07F7/24H01L51/46H01L51/54B82Y20/00B82Y40/00
CPCC09K11/06B82Y20/00B82Y40/00C07F7/24C09K2211/188H10K85/30Y02E10/549
Inventor 吴朝新代锦飞段新华焦博侯洵
Owner XI AN JIAOTONG UNIV
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