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Polymer-coated perovskite quantum dots, preparation method thereof, and semiconductor luminescent material including same

A polymer material and perovskite technology, applied in the field of optical materials, can solve the problems of complicated process, inability to disperse, and low efficiency, and achieve the effect of small particle size

Active Publication Date: 2021-01-26
LANZHOU UNIVERSITY
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Problems solved by technology

However, the existing coating methods are to prepare perovskite quantum dots first, then swell the polymer spheres in the solution of perovskite quantum dots, and then deswell to form a composite. The intermediate needs to be separated, and the process is complicated and inefficient. At the same time, the size of the polymer-coated perovskite quantum dots obtained at the same time is also relatively large (micron), and cannot be dispersed in water

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  • Polymer-coated perovskite quantum dots, preparation method thereof, and semiconductor luminescent material including same
  • Polymer-coated perovskite quantum dots, preparation method thereof, and semiconductor luminescent material including same
  • Polymer-coated perovskite quantum dots, preparation method thereof, and semiconductor luminescent material including same

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[0059] According to one aspect of the present invention, a kind of preparation method of polymer coating perovskite quantum dot, described preparation method comprises the following steps:

[0060] (a) providing a precursor solution containing a polymer material, a first precursor and a second precursor, adding the precursor solution to a n-hexane solution containing a surface ligand to form a water-in-oil emulsion;

[0061] (b) adding a demulsifier to the water-in-oil emulsion to demulsify to obtain polymer-coated perovskite quantum dots.

[0062] The present invention provides a method for preparing polymer-coated perovskite quantum dots. The preparation method firstly adds a precursor solution containing a polymer material, a first precursor and a second precursor to a n-hexane containing a surface ligand. alkane solution to form a water-in-oil emulsion; then adding a demulsifier to break the emulsion to obtain polymer-coated perovskite quantum dots. In the above method, t...

Embodiment 1

[0105] A kind of preparation method of macromolecule coated perovskite quantum dot, described preparation method comprises the following steps:

[0106] (1), the CH 3 NH 3 Br (0.455mmol), PbBr 2 (0.455mmol) and polyvinylidene fluoride (24.375mg) were dissolved in N,N-dimethylformamide (2.6mL) to form a precursor solution; oleic acid (0.5mL) and octylamine (20μL) with n-hexane Alkanes (10 mL) were mixed in a 50 mL round bottom flask; 0.8 mL of the precursor solution was added to the ligand-dissolved n-hexane solution under vigorous stirring to form a water-in-oil emulsion;

[0107] (2), adding tert-butanol (1.5mL) into the water-in-oil emulsion, after rapid demulsification, polymer-coated perovskite quantum dots are formed;

[0108] (3), 1 mL of the polymer-coated perovskite quantum dot solution obtained after demulsification was centrifuged at 5000 rpm for 5 minutes, and the resulting precipitate was redispersed in 1 mL of deionized water; the solution was centrifuged at 70...

Embodiment 2

[0110] A kind of preparation method of macromolecule coated perovskite quantum dot, described preparation method comprises the following steps:

[0111] (1), the CH 3 NH 3 Br (0.455mmol), PbBr 2 (0.455mmol) and polymethylmethacrylate (24.375mg) were dissolved in N,N-dimethylformamide (2.6mL) to form a precursor solution; oleic acid (0.5mL) and octylamine (20μL) Mix with n-hexane (10 mL) in a 50 mL round-bottomed flask; add 0.8 mL of the precursor solution to the ligand-dissolved n-hexane solution under vigorous stirring to form a water-in-oil emulsion;

[0112] (2), adding tert-butanol (1.5mL) into the water-in-oil emulsion, after rapid demulsification, polymer-coated perovskite quantum dots are formed;

[0113] (3), 1 mL of the polymer-coated perovskite quantum dot solution obtained after demulsification was centrifuged at 5000 rpm for 5 minutes, and the resulting precipitate was redispersed in 1 mL of deionized water; the solution was centrifuged at 7000 rpm for 5 minutes...

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Abstract

The invention provides a polymer-coated perovskite quantum dot, a preparation method thereof, and a semiconductor luminescent material including the same, and relates to the technical field of optical materials. The preparation method first comprises a polymer material, a first precursor and a second The precursor solution of the precursor is added to the n-hexane solution containing the surface ligand to form a water-in-oil emulsion; then a demulsifier is added to break the emulsion to obtain polymer-coated perovskite quantum dots. The polymer-coated perovskite quantum dots prepared by the above method can reach a smaller particle size of the nanometer scale; at the same time, the above preparation method is a one-pot method, and there is no need for intermediate separation steps during the preparation process, and the outer layer coating can be directly obtained. The polymer-coated perovskite quantum dots have the advantages of simple preparation process and high efficiency. In addition, the polymer-coated perovskite quantum dots prepared by this method can be uniformly dispersed in water.

Description

technical field [0001] The invention relates to the technical field of optical materials, in particular to a polymer-coated perovskite quantum dot, a preparation method thereof, and a semiconductor light-emitting material comprising the same. Background technique [0002] Perovskite quantum dots have the characteristics of easy tuning of luminescence, narrow emission spectrum, and high quantum efficiency. The LEDs prepared by using them even exceed the existing commercialized OLEDs in terms of color gamut. Therefore, perovskite quantum dots have become a research hotspot in the field of semiconductor light-emitting materials in recent years. [0003] However, the existing luminescent materials based on perovskite quantum dots generally have poor stability and are easily quenched when emitting light in air, making it difficult for subsequent applications. Therefore, it is generally necessary to coat the perovskite quantum dots with polymer secondary to improve their stabilit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/06C09K11/02C09K11/66C07C211/04C07C209/00H01L51/50B82Y30/00
CPCC09K11/06C09K11/025C09K11/664C07C209/00C07C211/04B82Y30/00H10K50/11
Inventor 张浩力刘晓飞
Owner LANZHOU UNIVERSITY
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