Perovskite quantum dot and preparation method and application thereof

A quantum dot and perovskite technology, which is applied in the field of titanium quantum dots and its preparation, can solve the problems of poor stability of perovskite quantum dots and low yield of perovskite quantum dots, and achieve stable solutions Poor performance, avoid incomplete coating, and controllable product performance

Pending Publication Date: 2021-08-17
WUXI UTMOST LIGHT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The stability of the perovskite quantum dots synthesized in the prior art in water and in the light irradiation environment is not good, and needs further improvement
[0003] In addition, the yield of perovskite quantum dots synthesized in the prior art is low, which needs to be further improved

Method used

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  • Perovskite quantum dot and preparation method and application thereof
  • Perovskite quantum dot and preparation method and application thereof
  • Perovskite quantum dot and preparation method and application thereof

Examples

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preparation example Construction

[0075] The method for preparing perovskite quantum dots according to the embodiments of the present invention has at least one of the following advantages:

[0076] 1) First, by raising the temperature T1 to not lower than the melting temperature of the perovskite quantum dot precursor and lower than the collapse temperature of the microporous material, the perovskite quantum dot precursor is melted and / or sublimated into a liquid state and / or gaseous state, so that liquid and / or gaseous perovskite quantum dot precursors enter the pores of the microporous material to deposit crystals; The perovskite crystallites are coated. The two-stage gradient temperature rise allows the perovskite to fully enter the pores of the microporous material, thereby avoiding incomplete coating of the perovskite and effectively avoiding competition with the collapse process of the microporous material. Quantum dot deposition and pore closure are carried out step by step, and the product performanc...

Embodiment 1

[0088] This embodiment provides a K-type CsPbBr 3 A method for preparing quantum dots, comprising the steps of:

[0089] (1) Weigh KBr and MCM-41 molecular sieve (aperture 3.7nm), add enough water into a beaker at a mass ratio of 1:1 and stir evenly, then dry to obtain the treated MCM-41 powder for later use.

[0090] (2) CsPbBr 3 Preparation of powder: Weigh 2 mmol of lead bromide and 2 mmol of cesium bromide into a round bottom flask, then add 3 ml of dimethyl sulfoxide and stir to dissolve for 30 minutes. To the above solution, 3mL of 48%wt hydrobromic acid was added dropwise, and the solution turned into an orange cloudy liquid. Centrifuge to obtain a precipitate, wash twice with isopropanol, and obtain CsPbBr 3 The powder was vacuum-dried at room temperature for later use.

[0091] (3) Weigh CsPbBr 3 The powder and the processed MCM-41 powder were mixed in a mortar at a mass ratio of 1:5, then put into a crucible and transferred to a muffle furnace.

[0092] (4) The...

Embodiment 2

[0104] This embodiment provides a kind of Na type CsPbBr 3 A method for preparing quantum dots, comprising the steps of:

[0105] (1) Weigh NaBr and SBA-15 molecular sieve (aperture 5nm), add enough water into a beaker according to the mass ratio of 3:1, stir evenly, and then dry to obtain the treated SBA-15 powder.

[0106] (2) CsPbBr 3 Preparation of powder: Weigh 2 mmol of lead bromide and 2 mmol of cesium bromide into a round bottom flask, then add 3 mL of dimethyl sulfoxide and stir to dissolve for 30 minutes. To the above solution, 3mL of 48%wt hydrobromic acid was added dropwise, and the solution turned into an orange cloudy liquid. Centrifuge to obtain a precipitate, wash twice with isopropanol, and obtain CsPbBr 3 The powder was vacuum-dried at room temperature for later use.

[0107] (3) Weigh CsPbBr 3 The powder and the processed SBA-15 powder were mixed in a mortar at a mass ratio of 1:3, then put into a crucible and transferred to a muffle furnace.

[0108] ...

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Abstract

The invention discloses a perovskite quantum dot and a preparation method and application thereof. The method comprises the following steps: (1) mixing a microporous material with a halide solution, and drying; (2) preparing a perovskite quantum dot precursor; (3) mixing the perovskite quantum dot precursor with the microporous material treated by the halide to obtain a mixed material; (4) heating the mixed material to T1, wherein T1 is not lower than the melting temperature of the perovskite quantum dot precursor and lower than the collapse temperature of the microporous material; and (5) heating the mixed material to T2, wherein T2 is not lower than the collapse temperature of the microporous material. The quantum dot prepared by the method disclosed by the invention is very stable in a water-oxygen environment and an illumination environment; the quantum yield is greater than 90%; and quantum dot deposition and pore closing are carried out step by step, and the product performance is controllable. In addition, the method has the advantages of simple reaction conditions, no toxic solvent, environmental protection, low cost, easy yield amplification and uniform quality.

Description

technical field [0001] The invention belongs to the technical field of perovskite quantum dots, and in particular relates to a titanium ore quantum dot with good stability and a preparation method and application thereof. Background technique [0002] Perovskite quantum dots have excellent photoelectric properties, have the advantages of pure luminescent color, high yield of quantum dots, and high tolerance to defects. They are favorable competitors for the next generation of display and lighting technologies. Due to the special crystal structure of perovskite ions, its humidity, temperature and light will affect its service life to a certain extent, so stability is the biggest problem that needs to be solved. In particular, improving the service life under the premise of ensuring the quantum yield of luminescence is a prerequisite for promoting large-scale commercial applications. The stability of perovskite quantum dots synthesized in the prior art in water and in the lig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/66B82Y20/00B82Y30/00B82Y40/00H01L31/0232H01L33/50
CPCC09K11/025C09K11/665B82Y20/00B82Y30/00B82Y40/00H01L33/502H01L31/02322
Inventor 季泽良郑策邢泽咏
Owner WUXI UTMOST LIGHT TECH CO LTD
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