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Super-hydrophobic perovskite/silicon dioxide composite light-emitting film and preparation method and application thereof

A technology of silicon dioxide and luminescent thin films, applied in chemical instruments and methods, luminescent materials, electrical components, etc., can solve the problem that the surface of perovskite materials does not have super-hydrophobic properties, does not meet the requirements of environmentally friendly preparation, and the stability needs to be further improved Improvement and other issues, to achieve the effect of low preparation cost, excellent stability, and easy operation

Active Publication Date: 2021-03-09
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the preparation conditions involved in the above method are relatively complicated, and toxic ligands or high temperature conditions need to be introduced, which do not meet the requirements of environmentally friendly preparation; and the surface of the obtained perovskite material does not have superhydrophobic properties, and its water resistance is limited. to be further improved

Method used

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  • Super-hydrophobic perovskite/silicon dioxide composite light-emitting film and preparation method and application thereof
  • Super-hydrophobic perovskite/silicon dioxide composite light-emitting film and preparation method and application thereof
  • Super-hydrophobic perovskite/silicon dioxide composite light-emitting film and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] A superhydrophobic perovskite / silicon dioxide composite luminescent film, the preparation method of which comprises the following steps:

[0037] 1) Weigh 69mg of PbBr with an electronic balance 2 In a 50mL beaker, measure 8mL of methanol with a graduated cylinder and pipette 0.6mL of ammonia water (concentration: 26wt%) into the above beaker, and continue stirring for 10min to obtain a mixed solution I;

[0038] 2) Weigh 11 mg of Cs with an electronic balance 2 CO 3 In a 10mL beaker, pipette 1mL of methanol and 4.4mL of tetraethyl orthosilicate (TEOS) into the above beaker, stir well until Cs 2 CO 3 Dissolve completely to obtain mixed liquid II;

[0039] 3) Under magnetic stirring, slowly drop the mixed solution II prepared in step 2) into the mixed solution I prepared in step 1) with a rubber dropper, and continue to stir and react for 0.5 h;

[0040] 4) While stirring, slowly add 4 mL of hexamethyldisilazane (HMDS) dropwise into the dispersion obtained in step 3...

Embodiment 2

[0045] A superhydrophobic perovskite / silicon dioxide composite luminescent film, the preparation method of which comprises the following steps:

[0046] 1) At room temperature, weigh 69 mg of PbBr with an electronic balance 2 In a 100mL beaker, measure 16mL of methanol with a graduated cylinder, pipette 1.2mL of ammonia water (concentration: 26wt%) into the above beaker, and continue stirring for 10min to obtain a mixed solution I;

[0047] 2) Weigh 11 mg of Cs with an electronic balance 2 CO 3 In a 25mL beaker, measure 2mL of methanol and 8.8mL of tetraethyl orthosilicate (TEOS) in the above beaker with a graduated cylinder, stir well until Cs 2 CO 3 Dissolve completely to obtain mixed liquid II;

[0048] 3) Under magnetic stirring, slowly drop the mixed solution II prepared in step 2) into the mixed solution I prepared in step 1) with a rubber dropper, and continue to stir and react for 0.5 h;

[0049] 4) While stirring, slowly add 8 mL of hexamethyldisilazane (HMDS) dr...

Embodiment 3

[0053] A superhydrophobic perovskite / silicon dioxide composite luminescent film, the preparation method of which comprises the following steps:

[0054] 1) At room temperature, weigh 69 mg of PbBr with an electronic balance 2 In a 250mL beaker, measure 24mL of methanol with a graduated cylinder and pipette 1.8mL of ammonia water (concentration: 26wt%) into the above beaker, and continue stirring for 10min to obtain a mixed solution I;

[0055] 2) Weigh 11 mg of Cs with an electronic balance 2 CO 3 In a 25mL beaker, use a measuring cylinder to measure 3mL of methanol and 13.2mL of tetraethyl orthosilicate (TEOS) in the above beaker, stir well until Cs 2 CO 3 Dissolve completely to obtain mixed liquid II;

[0056] 3) Under magnetic stirring, slowly drop the mixed solution II prepared in step 2) into the mixed solution I prepared in step 1) with a rubber dropper, and continue to stir and react for 0.5 h;

[0057] 4) While stirring, slowly add 12 mL of hexamethyldisilazane (H...

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Abstract

A preparation method of the super-hydrophobic perovskite / silicon dioxide composite light-emitting film comprises the following steps: firstly, uniformly dispersing PbBr2 and alkali liquor in an alcohol solvent to obtain a Pb-based dispersion liquid, uniformly dissolving Cs2CO3 and TEOS in the alcohol solvent to obtain a CsSi-based dispersion liquid, dropwise adding the Cs-Si-based dispersion liquid into the Pb-based dispersion liquid under a stirring condition, and after sufficient reaction for a certain period of time, adding hexamethyldisilazane for modification reaction, coating the obtained dispersion liquid with a film and dried, so that the super-hydrophobic perovskite / silicon dioxide composite light-emitting film with high efficiency and high stability is obtained. The preparation method provided by the invention is simple and easy to implement, mild in reaction condition and low in cost, macro preparation can be realized, and the obtained perovskite / silicon dioxide composite material can show good super-hydrophobic function and stability, and has a wide application prospect in the fields of self-cleaning, efficient and high-stability LEDs or fluorescent solar light collectors and the like.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to a high-efficiency and high-stable superhydrophobic perovskite / silicon dioxide composite luminescent film and its preparation method and application. Background technique [0002] In recent years, perovskite nanomaterials have become a research hotspot of semiconductor light-emitting materials due to their excellent luminescence performance, adjustable luminescence wavelength, and narrow half-maximum width of the fluorescence peak; however, the poor stability of this material limits its practical application. Popularization and application, especially in the air and humid environment, it will degrade due to the influence of water and oxygen, thus losing stability. Perovskite is an ionic crystal, and its instability mainly comes from the instability of its structure itself and the instability caused by its degradation in the environment. [0003] In order...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/66H01L33/50
CPCC09K11/025C09K11/665H01L33/502
Inventor 谢毅胡永飞
Owner WUHAN UNIV OF TECH
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