CN111349437B - Perovskite quantum dot based on castor oil as green solvent and preparation method thereof - Google Patents
Perovskite quantum dot based on castor oil as green solvent and preparation method thereof Download PDFInfo
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- CN111349437B CN111349437B CN202010314961.5A CN202010314961A CN111349437B CN 111349437 B CN111349437 B CN 111349437B CN 202010314961 A CN202010314961 A CN 202010314961A CN 111349437 B CN111349437 B CN 111349437B
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- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/74—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing arsenic, antimony or bismuth
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- C—CHEMISTRY; METALLURGY
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Abstract
The invention relates to a perovskite quantum dot taking castor oil as a green solvent and a preparation method thereof, which can reduce the pollution of an organic solvent to the environmentAnd is more environment-friendly. The surface defects of the perovskite quantum dots can be passivated, so that the perovskite quantum dots are more stable. The technical scheme adopted by the invention is as follows: taking 0.430-0.438 parts of cesium bromide and 0.608-0.616 parts of bismuth bromide in dry parts by mass, putting the cesium bromide and the bismuth bromide into a 20mL three-necked bottle, adding 0.259-0.271 parts of octylamine and 58.239-58.639 parts of castor oil, and stirring at normal temperature for 6 hours to form a precursor solution; taking out 5mL of precursor solution, slowly dropwise adding the precursor solution into 40.15-40.35 parts of absolute ethyl alcohol, violently stirring at 80 ℃, reacting for 10min, and naturally cooling to room temperature; centrifuging at 8000r/min, removing precipitate to obtain Cs 3 Bi 2 Br 9 A quantum dot solution.
Description
The technical field is as follows:
the invention relates to a perovskite quantum dot and a preparation method thereof, in particular to a perovskite quantum dot based on castor oil as a green solvent and a preparation method thereof.
Background art:
perovskite quantum dots are of great interest because of their high quantum efficiency, tunable luminescence, and narrow emission lines. Due to the unique quantum confinement effect, researchers can realize the tuning of the band gap by regulating and controlling the size of the band gap. Due to these excellent photoelectric properties, quantum dots have been widely used in solar cells, lasers, light emitting diodes, and bio-imaging. Although perovskite quantum dots have excellent performance in many aspects, many problems still exist in order to realize commercialization thereof. Firstly, the stability is poor, and the quantum dots are degraded in light, heat and air to different degrees, so that severe fluorescence quenching is caused, and the application field of the quantum dots is limited. Secondly, the process of preparing perovskite quantum dots always inevitably uses organic solvents, which causes pollution to the environment to a certain extent.
The castor is one of ten oil crops discovered worldwide at present and is a plant with high oil content. China is a castor oil rich country, the yield is in the third place of the world, and the main production places are concentrated in Xinjiang, northeast and the like. The castor oil belongs to non-edible oil, and is vegetable oil which only contains hydroxyl, can be regenerated and biologically degraded and has low cost.
The invention content is as follows:
the invention aims to provide a perovskite quantum dot taking castor oil as a green solvent and a preparation method thereof, which solve the problem that the environment is polluted by using an organic solvent in the existing perovskite quantum dot preparation process, can reduce the pollution of the organic solvent to the environment and is more green and environment-friendly. The surface defects of the perovskite quantum dots can be passivated, so that the perovskite quantum dots are more stable.
In order to achieve the purpose, the invention adopts the technical scheme that:
a perovskite quantum dot based on castor oil as green solvent is characterized in that: the material is prepared from the following raw materials: 0.430-0.438 parts of cesium bromide by dry mass parts; 0.608 to 0.616 portion of bismuth bromide; 0.259-0.271 of octylamine; 58.239-58.639 parts of castor oil; 40.15-40.35 parts of absolute ethyl alcohol.
A method for preparing perovskite quantum dots by taking castor oil as a green solvent is characterized by comprising the following steps: the method comprises the following steps:
taking 0.430-0.438 parts of cesium bromide and 0.608-0.616 parts of bismuth bromide in dry parts by mass, putting the cesium bromide and the bismuth bromide into a 20mL three-necked bottle, adding 0.259-0.271 parts of octylamine and 58.239-58.639 parts of castor oil, and stirring at normal temperature for 6 hours to form a precursor solution; taking out 5mL of precursor solution, slowly dropwise adding the precursor solution into 40.15-40.35 parts of absolute ethyl alcohol, violently stirring at 80 ℃, reacting for 10min, and naturally cooling to room temperature; centrifuging at 8000r/min, removing precipitate to obtain Cs 3 Bi 2 Br 9 A quantum dot solution.
Compared with the prior art, the invention has the following advantages and effects:
1. compared with a quantum dot solution obtained by taking DMSO as a solvent, the quantum dot solution has good stability, does not need to be added with an acid ligand, and is simpler to operate. In addition, the castor oil is used as the solvent, so that the use of an organic solvent is avoided, and the quantum dots can be passivated to a certain extent.
2. The raw materials of the invention have wide sources, are green and environment-friendly, and are cheap and easy to obtain;
3. the perovskite quantum dot solution prepared by the method has remarkably improved stability, is easy to generate fluorescence quenching in water compared with the quantum dot prepared by the traditional method, and can still keep the fluorescence characteristic after being mixed with deionized water for several hours in an equivalent manner;
4. according to the invention, the castor oil is used as the solvent, so that the use of an organic solvent and an acid ligand is avoided, the operation is more convenient, and the cost is saved.
The specific implementation mode is as follows:
the present invention will be described in detail with reference to specific embodiments. These examples are intended to illustrate the invention and are not intended to limit the scope of the invention. The implementation conditions used in the examples can be further adjusted according to the specific experimental environment, and the implementation conditions not mentioned are generally the conditions in routine experiments.
The invention relates to a perovskite quantum dot taking castor oil as a green solvent and a preparation method thereof, which comprises the steps of firstly dissolving cesium bromide and bismuth bromide in the castor oil, adding octylamine ligand to form a precursor solution, injecting a small amount of the precursor solution into anti-solvent ethanol, and violently stirring at 80 ℃ to form Cs 3 Bi 2 Br 9 A quantum dot solution. Removing impurities by centrifugation at 8000r/min to obtain clear Cs 3 Bi 2 Br 9 A quantum dot solution.
The invention is prepared by adopting the following raw materials:
0.430-0.438 parts of cesium bromide by dry mass; 0.608 to 0.616 portion of bismuth bromide; 0.259-0.271 of octylamine; 58.239-58.639 parts of castor oil; 40.15-40.35 parts of absolute ethyl alcohol.
The method is realized by the following steps:
taking 0.430-0.438 part of cesium bromide and 0.608-0.616 part of bismuth bromide by dry mass parts, putting into a 20mL three-necked bottle, adding 0.259-0.271 part of octylamine and 58.239-58.639 parts of castor oil, and stirring at normal temperature for 6 hours to form a precursor solution; taking out 5mL of precursor solution, slowly dropwise adding the precursor solution into 40.15-40.35 parts of absolute ethyl alcohol, violently stirring at 80 ℃, reacting for 10min, and naturally cooling to room temperature; centrifuging at 8000r/min, removing precipitate to obtain Cs 3 Bi 2 Br 9 A quantum dot solution.
Example 1
0.430 parts of cesium bromide and 0.608 parts of bismuth bromide are taken and placed into a 20mL three-necked bottle in terms of dry mass parts, 0.259 parts of octylamine and 58.239 parts of castor oil are added, and the mixture is stirred at normal temperature for 6 hours to form a precursor solution. 5mL of precursor solution is taken out and slowly dripped into 40.15 parts of absolute ethyl alcoholAnd (4) stirring vigorously at 80 ℃, reacting for 10min, and naturally cooling to room temperature. Centrifuging at 8000r/min, removing precipitate to obtain Cs 3 Bi 2 Br 9 A quantum dot solution.
Example 2
0.432 parts of cesium bromide and 0.610 parts of bismuth bromide are taken and put into a 20mL three-necked bottle in terms of dry mass parts, 0.262 parts of octylamine and 58.339 parts of castor oil are added, and the mixture is stirred at normal temperature for 6 hours to form a precursor solution. And taking out 5mL of precursor solution, slowly dropwise adding the precursor solution into 40.20 parts of absolute ethyl alcohol, violently stirring at 80 ℃, reacting for 10min, and naturally cooling to room temperature. Centrifuging at 8000r/min, removing precipitate to obtain Cs 3 Bi 2 Br 9 A quantum dot solution.
Example 3
0.434 part of cesium bromide and 0.612 part of bismuth bromide are taken and placed into a 20mL three-necked bottle in terms of dry mass parts, 0.265 part of octylamine and 58.439 parts of castor oil are added, and the mixture is stirred at normal temperature for 6 hours to form a precursor solution. And taking out 5mL of precursor solution, slowly dropwise adding the precursor solution into 40.25 parts of absolute ethyl alcohol, violently stirring at 80 ℃, reacting for 10min, and naturally cooling to room temperature. Centrifuging at 8000r/min, removing precipitate to obtain Cs 3 Bi 2 Br 9 A quantum dot solution.
Example 4
0.436 parts of cesium bromide and 0.614 parts of bismuth bromide are taken and placed into a 20mL three-necked bottle in terms of dry mass parts, 0.268 part of octylamine and 58.539 parts of castor oil are added, and the mixture is stirred for 6 hours at normal temperature to form a precursor solution. And taking out 5mL of precursor solution, slowly dropwise adding the precursor solution into 40.30 parts of absolute ethyl alcohol, violently stirring at 80 ℃, reacting for 10min, and naturally cooling to room temperature. Centrifuging at 8000r/min, removing precipitate to obtain Cs 3 Bi 2 Br 9 A quantum dot solution.
Example 5
0.438 parts of cesium bromide and 0.616 parts of bismuth bromide are taken and put into a 20mL three-necked bottle in terms of dry mass parts, 0.271 part of octylamine and 58.639 parts of castor oil are added, and the mixture is stirred at normal temperature for 6 hours to form a precursor solution. And taking out 5mL of precursor solution, slowly dropwise adding the precursor solution into 40.35 parts of absolute ethyl alcohol, violently stirring at 80 ℃, reacting for 10min, and naturally cooling to room temperature. 8000r/minCentrifuging, removing precipitate to obtain Cs 3 Bi 2 Br 9 A quantum dot solution.
The above-described embodiments are merely illustrative of the principles and effects of the present invention, and some embodiments in use, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the inventive concept.
Claims (1)
1. A perovskite quantum dot based on castor oil as green solvent is characterized in that: the material is prepared from the following raw materials: 0.430-0.438 parts of cesium bromide by dry mass; 0.608 to 0.616 portion of bismuth bromide; 0.259-0.271 of octylamine; 58.239-58.639 parts of castor oil; 40.15-40.35 parts of absolute ethyl alcohol;
the preparation method comprises the following steps:
taking 0.430-0.438 part of cesium bromide and 0.608-0.616 part of bismuth bromide by dry mass parts, putting into a 20mL three-necked bottle, adding 0.259-0.271 part of octylamine and 58.239-58.639 parts of castor oil, and stirring at normal temperature for 6 hours to form a precursor solution; taking out 5mL of precursor solution, slowly dropwise adding the precursor solution into 40.15-40.35 parts of absolute ethyl alcohol, violently stirring at 80 ℃, reacting for 10min, and naturally cooling to room temperature; centrifuging at 8000r/min, removing precipitate to obtain Cs 3 Bi 2 Br 9 A quantum dot solution.
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| CN112662393A (en) * | 2020-12-22 | 2021-04-16 | 陕西科技大学 | Method for stabilizing perovskite quantum dots by adopting all-biobased material |
| CN114790390A (en) * | 2022-03-31 | 2022-07-26 | 陕西科技大学 | Method for improving stability of perovskite quantum dots by taking green solvent as acid ligand |
| CN114656961A (en) * | 2022-03-31 | 2022-06-24 | 陕西科技大学 | Method for preparing perovskite quantum dots by adopting ricinoleic acid as solvent and ligand |
| CN114702068A (en) * | 2022-04-02 | 2022-07-05 | 陕西科技大学 | Method for preparing perovskite nanocrystalline by using oleic acid ligand as solvent and adopting ultrasonic-assisted method |
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