Composite perovskite material with CsPbBr3 doped in CsPb2Br5, preparation method thereof, and application thereof

A technology of composite perovskite and aqueous solution, applied in the directions of luminescent materials, chemical instruments and methods, lead compounds, etc., can solve the problem that optical performance and stability cannot be both at the same time, and achieve easy implementation of the process, low environmental pollution, and fluorescence. Excellent strength

Active Publication Date: 2020-04-03
SHANDONG ANALYSIS & TEST CENT
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Problems solved by technology

[0005] In order to solve the problem that the excellent optical performance and stability of the perovskite quantum dot material in the prior art cannot be combine...

Method used

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  • Composite perovskite material with CsPbBr3 doped in CsPb2Br5, preparation method thereof, and application thereof
  • Composite perovskite material with CsPbBr3 doped in CsPb2Br5, preparation method thereof, and application thereof
  • Composite perovskite material with CsPbBr3 doped in CsPb2Br5, preparation method thereof, and application thereof

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preparation example Construction

[0041] The present invention also includes CsPb 2 Br 5 Medium doped CsPbBr 3 The preparation method of composite perovskite material, comprises the following steps:

[0042] ① Mix lead nitrate solution and trimesic acid aqueous solution, ultrasonically vibrate, filter with suction, wash with absolute ethanol, and dry to obtain Pb-MOF powder;

[0043] ② dissolving cesium bromide in ultrapure water to obtain cesium bromide aqueous solution;

[0044] ③Under ultrasonic vibration, disperse Pb-MOF powder in ethanol, drop cesium bromide aqueous solution into it, ultrasonic vibration, filter, wash, freeze-dry to obtain CsPb 2 Br 5 Medium doped CsPbBr 3 doped perovskite materials.

[0045] The concentration of lead nitrate solution is 0.01-0.1mol / L, the concentration of trimesic acid aqueous solution is 0.01-0.1mol / L, and the molar ratio of lead nitrate to trimesic acid is 1-2:1.

[0046] The concentration of cesium bromide aqueous solution is 200-400 mg / ml.

[0047] When the P...

Embodiment 1

[0055] A CsPb 2 Br 5 Medium doped CsPbBr 3 The preparation method of composite perovskite material, comprises the following steps:

[0056] ①Mix the lead nitrate solution with a concentration of 0.01mol / L and the aqueous solution of trimesic acid with a concentration of 0.01mol / L, ultrasonically oscillate, filter with suction, wash with absolute ethanol, and dry to obtain Pb-MOF powder; lead nitrate solution The volume ratio with trimesic acid solution is 2:1;

[0057] ②Dissolve cesium bromide in ultrapure water to prepare an aqueous cesium bromide solution with a concentration of 200 mg / ml;

[0058] ③Under ultrasonic vibration, take 1g of Pb-MOF powder obtained in step ① and disperse it in 50ml of ethanol, add dropwise 25ml of cesium bromide aqueous solution with a concentration of 200mg / ml, ultrasonic vibration, filter, wash, and freeze-dry to obtain CsPb 2 Br 5 Medium doped CsPbBr 3 doped perovskite materials.

Embodiment 2

[0060] A CsPb 2 Br 5 Medium doped CsPbBr 3 The preparation method of composite perovskite material, comprises the following steps:

[0061] ①Mix the lead nitrate solution with a concentration of 0.1mol / L and the aqueous solution of trimesic acid with a concentration of 0.1mol / L, ultrasonically oscillate, filter with suction, wash with absolute ethanol, and dry to obtain Pb-MOF powder; lead nitrate The volume ratio of solution and trimesic acid solution is 1:1;

[0062] ②Dissolve cesium bromide in ultrapure water to prepare an aqueous cesium bromide solution with a concentration of 400 mg / ml;

[0063] ③ Under ultrasonic vibration, take 1 g of the Pb-MOF powder obtained in step ① and disperse it in ethanol, add dropwise 37.5 ml of cesium bromide aqueous solution with a concentration of 400 mg / ml, ultrasonic vibration, filter, wash, and freeze-dry to obtain CsPb 2 Br 5 Medium doped CsPbBr 3 doped perovskite materials.

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Abstract

The invention discloses a composite perovskite material with CsPbBr3 doped in CsPb2Br5 and a preparation method thereof. The doped perovskite material is formed by doping a small amount of CsPbBr3 ina CsPb2Br5 material. The design of the preparation method provided by the invention is skillful, firstly, a metal organic framework Pb-MOF taking lead as a framework is synthesized by utilizing a trimesic acid ligand and lead ions, then a cesium bromide aqueous solution and the Pb-MOF react under an ultrasonic condition in an alcoholic solution, and after the Pb-MOF is dissociated in the reaction,a composite material with a small amount of CsPbBr3 doped in CsPb2Br5 is obtained. The synthesis process has few steps, the process is easy to implement, heating and inert gas protection are not needed, and energies are saved. Used synthetic solvents are only pure water and ethanol and are environment-friendly, and little pollution is caused to the environment.

Description

technical field [0001] The invention relates to the technical field of perovskite, specifically a kind of CsPb 2 Br 5 Medium doped CsPbBr 3 Composite perovskite material and its preparation method and use. Background technique [0002] In recent years, all-inorganic perovskite quantum dot materials (CsPbX 3 PQDs) have attracted increasing attention due to their ultrahigh photoluminescence efficiency, flexible and tunable emission wavelengths, and narrow-band emission. field. However, the structural characteristics of pure perovskite quantum dot materials make them very sensitive to humidity, light and temperature, and their chemical stability is poor under general environmental conditions, and they are easily hydrolyzed, resulting in the destruction of the crystal structure, which greatly limits the development of perovskite quantum dots. Application of materials; in order to solve the problem of poor stability of perovskite quantum dots, organic ligands or polymers suc...

Claims

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Application Information

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IPC IPC(8): C01G21/00C09K11/66
CPCC01G21/006C09K11/665C01P2002/72C01P2002/85C01P2004/04C01P2004/03C01P2004/82
Inventor 薛富民郝翠程燕于帅刘伟王晓
Owner SHANDONG ANALYSIS & TEST CENT
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