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Method for preparing fluorescence precise adjustable perovskite nanocrystals by using metal halogenated inorganic salt aqueous solution as anion exchange reagent

An inorganic salt solution, metal halide technology, applied in chemical instruments and methods, nanotechnology for materials and surface science, inorganic chemistry, etc., can solve problems such as difficult to achieve continuous and precise control of the full spectrum, low reactivity, etc.

Inactive Publication Date: 2019-01-22
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these methods can realize the full-spectrum emission properties of perovskite nanocrystals, these anion exchange reagents are not quantitative, have low reactivity and are prone to produce heterogeneous perovskite nanocrystals, so in the anion exchange process It is difficult to achieve continuous and precise regulation of the full spectrum

Method used

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  • Method for preparing fluorescence precise adjustable perovskite nanocrystals by using metal halogenated inorganic salt aqueous solution as anion exchange reagent
  • Method for preparing fluorescence precise adjustable perovskite nanocrystals by using metal halogenated inorganic salt aqueous solution as anion exchange reagent
  • Method for preparing fluorescence precise adjustable perovskite nanocrystals by using metal halogenated inorganic salt aqueous solution as anion exchange reagent

Examples

Experimental program
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Effect test

Embodiment 1

[0015] Add 450mg of zinc bromide powder into 0.5mL of water, shake to dissolve, and prepare an aqueous solution of zinc bromide for use. Add 0.5 μL zinc bromide aqueous solution to 2 mL pre-prepared CsPbCl 3 Nanocrystalline (Nano Lett.2015, 15, 3692-3696) toluene solution, fully oscillated under 20 watts of ultrasonic power, after 5 minutes of ultrasonication at room temperature, the anion-exchanged CsPbCl 0.004 Br 2.996 Perovskite nanocrystals. Centrifuge at 8000 rpm for 5 minutes and centrifuge twice in total. The size of the nanocrystals of this sample does not change significantly, and the average size is 14.9nm of CsPbCl 0.004 Br 2.996 Perovskite nanocrystals, the fluorescence color is in the violet region, and the final fluorescence emission peak is at 408 nanometers. Finally, the CsPbCl in the above violet region can be 0.004 Br 2.996 The perovskite nanocrystals were dissolved in toluene to obtain a nanoparticle solution with a concentration of 0.03mol / L.

Embodiment 2

[0017]Add 450mg of zinc bromide powder into 0.5mL of water, shake to dissolve, and prepare an aqueous solution of zinc bromide for use. Add 6 μL, 6.1 μL, 6.2 μL, 6.3 μL, 6.4 μL, 6.5 μL, 6.6 μL, 6.7 μL of zinc bromide aqueous solution to 2 mL of pre-prepared CsPbCl 3 Nanocrystal (Nano Lett.2015, 15, 3692-3696) in toluene solution, fully oscillated under the ultrasonic power of 100 watts, after 30 seconds of ultrasonication at room temperature, the anion-exchanged CsPbCl x Br 3-x Perovskite nanocrystals (0.048≤x≤0.0536). Centrifuge at 8,000 rpm for 5 minutes and centrifuge twice in total. The size of the nanocrystals of multiple samples does not change significantly, and the average size is 15.2nm for CsPbCl x Br 3-x (0.048≤x≤0.0536) perovskite nanocrystals, the fluorescence color is in the blue light region, and the final fluorescence emission peaks are at 458 nm, 459 nm, 460 nm, 461 nm, 462 nm, 463 nm, 464 nm, 465 nm , the fluorescence spectrum realizes the continuous chan...

Embodiment 3

[0019] Add 450mg of zinc bromide powder into 0.5mL of water, shake to dissolve, and prepare an aqueous solution of zinc bromide for use. Add 10 μL, 10.1 μL, 10.3 μL, 10.4 μL, 10.6 μL, 10.7 μL, 10.8 μL, 11 μL of zinc bromide aqueous solution to 2 mL of pre-prepared CsPbCl 3 Nanocrystalline (Nano Lett.2015, 15, 3692-3696) in toluene solution, fully oscillated at 100 watts of ultrasonic power, after 1 minute of ultrasonication at room temperature, the anion-exchanged CsPbCl x Br 3-x Perovskite nanocrystals (0.08≤x≤0.088). Centrifuge at 8,000 rpm for 5 minutes and centrifuge twice in total. The size of the nanocrystals of multiple samples does not change significantly, and the average size of CsPbCl is 15.9 nanometers. x Br 3-x (0.08≤x≤0.088) perovskite nanocrystals, the fluorescence color is in the blue light region, and the final fluorescence emission peaks are at 502 nm, 503 nm, 504 nm, 505 nm, 506 nm, 507 nm, 508 nm, 509 nm . , the fluorescence spectrum realizes the conti...

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Abstract

The invention discloses a method for preparing fluorescence precise adjustable perovskite nanocrystals by using a metal halogenated inorganic salt aqueous solution as an anion exchange reagent, and belongs to the technical field of preparation of semiconductor nanocrystals. The method is characterized in that metal halogenated inorganic salt is dissolved into water and is fully ionized, so that the aims of promoting the reaction activity of halogen ions and accelerating the anion exchange reaction rate are achieved. According to the method, the addition amount of the metal halogenated inorganic salt aqueous solution in an oil phase solution of perovskite nanocrystals is quantitatively controlled; in addition, the water-oil two-phase reaction is promoted by using ultrasound, so that continuous and accurate regulation of a fluorescence emission spectrum at a nanometer interval in the full spectral range is realized. The method disclosed by the invention has the advantages that the disadvantages of complex synthesis, low phase purity, low reaction rate, high toxicity and the like of an existing anionic exchange method are effectively overcome; the perovskite nanocrystals with preciseadjustable full spectral fluorescence can be accurately, easily and conveniently prepared in batch.

Description

technical field [0001] The invention belongs to the technical field of semiconductor nanocrystal preparation, and specifically relates to a method for preparing perovskite nanocrystals with full-spectrum emission and precisely adjustable fluorescence using a metal halide inorganic salt solution as an anion exchange reagent. Background technique [0002] As a new type of fluorescent material, perovskite nanocrystals have played an important role in the fields of lighting and display due to their high quantum efficiency, narrow half-peak width, and full-spectrum emission. They have attracted the attention of researchers in recent years. . However, because its size is generally larger than its Bohr exciton radius, it restricts its fluorescence properties similar to the quantum confinement effect of traditional semiconductor nanocrystals to produce precise fluorescence adjustment. However, perovskite nanocrystals have anion-exchange properties, and researchers usually adjust th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G21/00C09K11/66B82Y30/00B82Y20/00
CPCB82Y20/00B82Y30/00C01G21/006C01P2002/34C01P2004/64C09K11/665
Inventor 张皓刘慧雯许文哲庄婉鑫
Owner JILIN UNIV
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