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Application of metal halide perovskite CsPbX3 in photocatalytic bionic biosynthesis

A metal halide and biosynthesis technology, applied in the direction of physical/chemical process catalysts, chemical/physical processes, luminescent materials, etc., can solve the long-lasting luminescent properties of metal halide perovskites that no one has reported, and achieve Expand the effect of the application

Active Publication Date: 2021-03-30
WUHAN UNIV
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  • Abstract
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Problems solved by technology

[0004] Metal halide perovskites have been synthesized by many people, which have excellent photoelectric properties, such as high quantum yield, adjustable band gap, etc., but no one has reported the long afterglow luminescence properties of metal halide perovskites.

Method used

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  • Application of metal halide perovskite CsPbX3 in photocatalytic bionic biosynthesis
  • Application of metal halide perovskite CsPbX3 in photocatalytic bionic biosynthesis
  • Application of metal halide perovskite CsPbX3 in photocatalytic bionic biosynthesis

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Embodiment 1

[0036] Example 1: Perovskite CsPbX 3 Preparation of nanocrystals

[0037] Used in the present invention to CsPbCl 3 , CsPbCl 1.5 Br 1.5 , CsPbBr 3 , CsPbBr 1.5 I 1.5 , CsPbI 3 A total of 5 kinds of perovskite nanocrystals.

[0038] 1) Take 0.814g Cs 2 CO 3 Add to 40mL octadecene solution, then add 2.5mL oleic acid, heat the solution to 120°C for 1 hour to remove water and oxygen in the solution, and heat at 150°C for 2 hours under argon atmosphere to make Cs 2 CO 3 Complete reaction with oleic acid to obtain a transparent light yellow cesium oleate precursor solution;

[0039] 2) with CsPbBr 3 The preparation of nanocrystals is an example: take 0.38mmol of PbBr 2 (140mg) was added to 10mL octadecene solution, heated to 120°C and vacuum-dried for 1 hour. Under the condition of argon, add 1mL oleic acid and 1mL oleylamine to PbBr 2completely dissolved. Then the temperature was raised to 160 ° C, the solution was clear and light yellow, and then 1 mL of cesium ole...

Embodiment 2

[0041] Example 2: Perovskite CsPbBr 3 @TiO 2 Preparation of nanoparticles

[0042] Add 20 µL of tetrabutyl titanate to 1 mL of toluene to obtain a solution of tetrabutyl titanate in toluene and prepare 1 mg / mL LCsPbBr 3 Slowly add 1mL tetrabutyl titanate toluene solution to the solution under stirring, react at room temperature for about 3h, then centrifuge the obtained solution at 5000r / min for 5min, and vacuum-dry the obtained precipitate at 80°C for about 10h, the final dried product was calcined at 300°C for 5h under argon flow, and ground to obtain CsPbBr 3 @TiO 2 nanoparticles.

Embodiment 3

[0043] Example 3: CsPbX 3 Long-lasting luminescent properties of nanocrystals

[0044] 1) get the CsPbCl obtained in embodiment 1 3 , CsPbCl 1.5 Br 1.5 , CsPbBr 3 , CsPbBr 1.5 I 1.5 , CsPbI 3 1 mL of n-hexane solutions of five perovskite nanocrystals were added to a 24-well plate, and irradiated with 365 nm light from a portable ultraviolet lamp for 3 min. Remove the ultraviolet light, and immediately put it into an IVIS Lumina small animal in vivo imager (Caliper, America) to record the afterglow luminescence attenuation image, and the exposure time is set to 60s.

[0045] 2) with the CsPbBr obtained in embodiment 1 3 The n-hexane solution was centrifuged at 9000r / min for 5min, the obtained precipitate was vacuum-dried overnight, and ground to obtain CsPbBr 3 nanocrystalline powder. CsPbBr was recorded with a SLR camera (Nikon, D7100, Japan) 3 The image of nanocrystalline powder under the irradiation of UV lamp (365nm) and after it is turned off can be obtained ...

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Abstract

The invention relates to the technical field of luminescent materials, in particular to application of metal halide perovskite CsPbX3 in photocatalytic biomimetic synthesis, and the long afterglow luminescent property of the metal halide perovskite CsPbX3 is applied to photocatalytic biosynthesis. According to the invention, the long afterglow luminescence time of the metal halide perovskite CsPbX3 is as long as 1 h or more. The long-afterglow luminescence of the metal halide perovskite CsPbX3 is applied to photocatalytic biosynthesis, and the yield of photocatalytic biosynthesis can be increased by long-life photo-induced electrons of the perovskite. The application of the perovskite material in the aspect of energy can be expanded, and new inspiration is brought to the development of artificial photosynthesis. According to the photocatalytic biosynthesis system constructed in the invention, the light quantum yield is as high as 3.24%, and the important value of the long afterglow luminescence property of perovskite to the photocatalytic activity is embodied.

Description

technical field [0001] The invention relates to the technical field of luminescent materials, in particular to a metal halide perovskite CsPbX 3 Applications in photocatalytic biomimetic biosynthesis. Background technique [0002] Metal halide perovskites have unique photoelectric properties, such as high carrier mobility, high quantum yield, and adjustable bandgap, and are widely used in solar cells, light-emitting diodes, photodetectors, and other fields. Among them, perovskites The photoelectric conversion efficiency of mineral solar cells has developed close to commercial silicon-based solar cells in a short period of time, and the internal quantum efficiency of perovskite LEDs has also approached 100%. The optoelectronic properties of perovskite materials are closely related to their microstructure. According to reports, adjusting the microstructure of perovskite by doping and other methods can change the crystal structure, electronic structure, band gap and crystalli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/135B01J27/138C09K11/66C12P7/40C12P7/24
CPCB01J27/135B01J27/138C09K11/665C12P7/40C12P7/24B01J35/39
Inventor 袁荃王杰李志恒
Owner WUHAN UNIV
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