Zinc oxide nanocrystal, zinc oxide nanocrystal composition, preparation method thereof, and electroluminescent device
A technology of zinc oxide nanocrystals and zinc oxide nanocrystals, which is applied in the field of quantum dot material preparation, can solve problems such as surface defects of zinc oxide nanocrystals, and achieve the effect of solving delayed luminescence and improving electrical properties
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[0034] In yet another typical embodiment of the present application, a method for preparing zinc oxide nanocrystals is provided, wherein the zinc oxide nanocrystals include a zinc oxide nanocrystal host and a surface ligand, and the surface ligands include one or more sulfhydryl groups The alcohol ligand, the mercapto alcohol ligand has the following structural formula: -S-R-OH, wherein, R represents a linear alkyl chain or a branched alkyl chain, and the preparation method includes: step S1, using a solution method to prepare the alcohol of zinc oxide nanocrystals solution, the zinc oxide nanocrystals have carboxylate surface ligands and hydroxide surface ligands; step S2, mixing the alcoholic solution of the zinc oxide nanocrystals with the alcoholic solution of the alkaline salt compound to form a first mixed solution; and step S3, the first mixed solution is mixed with the mercapto alcohol that provides the mercapto alcohol ligand to form a reaction system, and the pH value...
Embodiment 1
[0048]First, an ethanol solution of zinc oxide nanocrystals was prepared by a conventional low-temperature solution method: 3 mmol (0.6719 g) of solid zinc acetate dihydrate was weighed and poured into a 50 ml round-bottomed flask. 30 ml of dimethyl sulfoxide (DMSO) was placed in the above round-bottomed flask, and the water bath was at 30° C. until the zinc acetate dihydrate was completely dissolved to form a solution of zinc acetate dihydrate in dimethyl sulfoxide (DMSO). 5 mmol (0.9246 g) of tetramethylammonium hydroxide pentahydrate (TMAH) was weighed and dissolved in 10 ml of absolute ethanol to prepare an ethanol solution of tetramethylammonium hydroxide pentahydrate (TMAH). The solution was slowly added dropwise to the dimethyl sulfoxide solution of zinc acetate dihydrate, the dropwise addition was completed in 10 minutes, and the reaction was continued in a constant temperature water bath at 30° C. for 1 hour to obtain a zinc oxide nanocrystal solution. Purification: T...
Embodiment 2
[0051] First, an ethanolic solution of zinc oxide nanocrystals was prepared by the same method as in Example 1; then 0.5 ml of the ethanolic solution of zinc oxide nanocrystals was added to an ethanolic solution of tetramethylammonium hydroxide pentahydrate to adjust the pH to 8 about to obtain a mixed solution; finally, add 0.5ml of 3-mercapto-1-hexanol to the mixed solution, and continue to utilize the ethanolic solution of tetramethylammonium hydroxide pentahydrate to adjust the pH to about 8 to obtain a reaction system; the reaction is 10min , and the ethanol solution of tetramethylammonium hydroxide pentahydrate is used to control the pH value of the reaction system in the reaction process and the pH value of the reaction system is not less than 7, the obtained product system is precipitated with hexane, and the obtained precipitate is dissolved in ethanol to obtain Example 2 solution of zinc oxide nanocrystals with mercapto alcohol ligands.
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