Preparation method of 2-hexyldecanoic acid modified all-inorganic perovskite quantum dot material

Abstract

The invention discloses a preparation method of a 2-hexyldecanoic acid modified all-inorganic perovskite quantum dot material. The 2-hexyldecanoic acid modified calcium-titanium quantum dot material with high stability, good dispersity and excellent optical properties is prepared by the following steps: modifying a perovskite quantum dot material through 2-hexyldecanoic acid, preparing a cesium 2-hexyldecanoate precursor solution, preparing a lead halide precursor solution, preparing a reaction stock solution of the perovskite quantum dot material, and purifying the 2-hexyldecanoic acid modified perovskite quantum dot material. According to the invention, binding energy between branched chains and the perovskite quantum dot material is improved by utilizing shorter branched chains in the 2-hexyldecanoic acid, so that dispersity and stability of the perovskite quantum dot material are improved. Meanwhile, the shorter branched chains in the 2-hexyldecanoic acid are also beneficial to recombination of electrons and holes in the perovskite quantum dot material, and stability and optical characteristics of the perovskite quantum dot material are further improved.

Description

technical field [0001] The invention belongs to the technical field of synthesis of all-inorganic perovskite quantum dots, and in particular relates to a preparation method of an all-inorganic perovskite quantum dot material modified by 2-hexyldecanoic acid. Background technique [0002] The disadvantage of poor stability in environments such as light, heat, air, and moisture has always restricted the practical application of all-inorganic perovskite quantum dots. In recent years, the poor stability of all-inorganic perovskite quantum dot materials has also attracted extensive attention from researchers. 3 For example, there are currently many methods to improve its stability, such as ion doping, core-shell structure, surface passivation, surface coating, post-treatment, ligand modification, etc. These methods are relatively effective at present, and each There are advantages and disadvantages, however, there is no result to greatly improve its stability. [0003] At prese...

AI Technical Summary

Problems solved by technology

[0002] The disadvantage of poor stability in environments such as light, heat, air, and moisture has restricted the practical application of all-inorganic perovskite quantum dots.

In recent years, the poor stability of all-inorganic perovskite quantum dot materials has also attracted extensive attention from researchers. 3 For example, there are currently many methods to improve its stability, such as ion doping, core-shell structure, surface passivation, surface coating, post-treatment, ligand modification, etc. These methods are relatively effective at present, and each There are advantages and disadvantages, however, there is no result to greatly improve its stability

[0003] At present, the traditional oleic acid ligand is used in the preparation of all-inorganic perovskite quantum dots. It is a long-chain organic ligand containing 18 carbon atoms, which can better maintain the surface, size, and lattice of quantum dots. The structure and interface are stable, but after long-term storage in the air environment, quantum dots are prone to agglomeration, which affects the luminescence stability of quantum dots, thus greatly restricting its practical application in the field of optoelectronics

The main reason for the agglomeration is that the binding energy between the long chain of oleic acid ligand and quantum dots is small, which is not conducive to the dispersion of quantum dots.

Images