Method for synthesizing silicon dioxide cladded organic-inorganic perovskite structure quantum dot and application of quantum dot synthesized by method

Abstract

The invention relates to a method for synthesizing a silicon dioxide cladded organic-inorganic perovskite structure quantum dot and application of the quantum dot synthesized by the method, and belongs to the field of nano-material synthesis. The method comprises the following steps: taking methylammonium halide and lead halide as raw materials and taking oleic acid and an amino-containing silane coupling agent as ligands to synthesize the stable and efficient silicon dioxide cladded organic-inorganic perovskite structure quantum dot, which is capable of being processed in a solution, in one step through a solution method at room temperature. According to the method provided by the invention, the stability of the quantum dot is greatly increased through silicon dioxide cladding; meanwhile, high fluorescent quantum efficiency of the quantum dot is ensured and can reach 95 percent at maximum. Meanwhile, the quantum dot prepared by the method can be dispersed into solvents including toluene and the like to form a stable solution. A quantum dot solution and a toluene solution of polystyrene are mixed and can be used for preparing a warm white-light light emitting diode; the prepared white-light light emitting diode has a color coordinate (0.38, 0.43) and color temperature of 4500K, and can be applied to various fields including information storage, information encryption, counterfeiting prevention, illumination display and the like.

Description

technical field [0001] The invention belongs to the field of nanometer material science, and specifically relates to a method for synthesizing silicon dioxide-coated organic-inorganic perovskite structure quantum dots by using an improved room temperature one-step method and an application of the synthesized quantum dots. Background technique [0002] In the past three decades, colloidal semiconductor quantum dots have been widely used in biological imaging, photocatalysis, solar cells, light-emitting diodes, photodetectors and other fields due to their unique photoelectric properties. However, the commonly used cadmium-based quantum dots are limited in their application due to their high toxicity and complex synthesis process. In recent years, a new type of quantum dot with perovskite structure has attracted people's attention due to its high quantum efficiency, narrow emission spectrum, continuously adjustable emission wavelength with the change of composition, and simple ...

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Problems solved by technology

[0004] At present, there have been many attempts to coat silica, such as coating by tetramethoxysilane post-treatment, but this method usually obtains particles with a particle size of several hundred nanometers; Grow perovskite quantum dots to improve stability and obtain quantum dots with specific structures, but the particles obtained by this method are usually large and cannot be dispersed into the solution, and the solution processing performance is poor; such as obtained by adding silicon-containing ligands Quantum dots, but this method generally obtains quantum dot solid powder, and the solution processing performance is poor

At the same time, the silicon-containing ligands are easily hydrolyzed in the precursor solution, resulting in a serious decrease in luminous efficiency.

[0005] The prior art has not achieved efficient, stable, solution-processable silica-coated organic-inorganic perovskite quantum dots

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