Preparation method of bromide perovskite quantum dots
A technology of perovskite and quantum dots, which is applied in the field of preparation of quantum dot light-emitting materials, can solve the problems of perovskite quantum dots being unstable to environmental factors, unstable properties of quantum dots, easy to detach from the crystal surface, etc., and achieve simple equipment Easy to operate, easy to promote, and low-cost effects
Pending Publication Date: 2019-08-20
NANJING UNIV OF POSTS & TELECOMM
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[0003] Although perovskite quantum dots have shown excellent luminescent properties, there are still some problems that limit their large-scale application in the actual production process, the biggest problem is the instability of perovskite quantum dots to environmental factors Rapid aggregation, precipitation, and even decomposition under conditions such as ultraviolet rays, humidity, oxygen, solvents, and temperature
Taking organic-inorganic hybrid perovskite quantum dots as an example, due to the weak binding properties between oleic acid and octylamine on the surface of colloidal quantum dots, the ligands of oleic acid and octylamine on the surface of quantum dots in the process of centrifugal purification It is easy to detach from the crystal surface, resulting in unstable properties of the synthesized quantum dots, which in turn affects its function and use
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[0018] The preparation method of the bromide perovskite quantum dot of the present embodiment comprises the steps:
[0019] (1) Synthesis of perovskite quantum dots
[0020] 0.48mmol of CH(NH 2 ) 2 Br (formamidine ammonium bromide), 0.40 mmol of (lead bromide) PbBr 2 , 500 μL of oleic acid and 30 μL of n-octylamine were dissolved in 4 mL of N,N-dimethylformamide (DMF), and stirred for 30 minutes to form a transparent perovskite quantum dot precursor solution. Then 250 μL of perovskite quantum dot precursor was dropped into 10 mL of toluene solution which was vigorously stirred. At this time, the toluene solution turned into a yellow-green solution immediately after mixing. All reactions were performed under ambient conditions at room temperature 23.5°C.
[0021] (2) Passivation of perovskite quantum dots
[0022] 0.05 g of dodecyl phosphoric acid was dissolved in 5 mL of toluene solution to obtain a toluene solution of dodecyl phosphoric acid. Then the perovskite quantu...
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The invention discloses a preparation method of bromide perovskite quantum dots. The method comprises the following steps: (1) dissolving methylamine or amidinoammonium bromide, metal bromide, n-octylamine and oleic acid in N,N-dimethylformamide, and performing stirring to obtain a perovskite quantum dot precursor solution; (2) taking and dissolving dodecylphosphoric acid in a weakly polar solventto obtain a weakly polar solvent solution of dodecylphosphoric acid; (3) adding the perovskite quantum dot precursor solution obtained in step (1) to a toluene solution, and performing sufficient stirring to obtain a clarified yellow green perovskite quantum dot solution; and (4) centrifugally purifying the yellow green perovskite quantum dot solution obtained in step (3), adding the weakly polarsolvent solution of the dodecylphosphoric acid, obtained in step (2), and performing sufficient stirring to achieve a complete reaction in order to obtain a passivated perovskite quantum dot solution. The bromide perovskite quantum dots prepared in the invention have the advantages of good stability, high fluorescence intensity and large size.
Description
technical field [0001] The invention relates to a preparation method of a quantum dot luminescent material, in particular to a preparation method of a bromide perovskite quantum dot. Background technique [0002] Perovskite quantum dots have good application development in the field of display lighting such as light-emitting diodes and quantum dot TVs. Perovskite quantum dots are a solution-processable semiconductor material with remarkable optoelectronic properties, such as high luminous efficiency, extremely narrow emission lines, wide color gamut and easier bandgap tunability, etc. The emission color of quantum dots can be adjusted simply by the size and the ratio of halogen atoms to obtain emission in the visible light range, and its high color purity and wide color gamut are expected to make them candidates for next-generation displays. [0003] Although perovskite quantum dots have shown excellent luminescent properties, there are still some problems that limit their ...
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Login to View More IPC IPC(8): C09K11/02C09K11/06C09K11/66B82Y30/00
CPCC09K11/06C09K11/025C09K11/664B82Y30/00
Inventor 陈淑芬高晓慧于洪涛
Owner NANJING UNIV OF POSTS & TELECOMM