Method for synthesizing ultra-stable totally-inorganic CsPbX3 perovskite under room temperature and application thereof

Abstract

The invention discloses a method for synthesizing ultra-stable totally-inorganic CsPbX3 perovskite under a room temperature. The method comprises the following steps: injecting a precursor into methylbenzene under vigorous stirring, reacting 3 to 5 minutes, centrifuging several times by using the methylbenzene, and performing vacuum drying to obtain the CsPbX3 perovskite. According to the method for synthesizing the CsPbX3 perovskite, inert gas protection is not required, heating is not required, and only dropwise adding at normal temperature is required; moreover, the method is easy to operate and easy to reproduce; a large amount of the CsPbX3 perovskite can be prepared within a short time; more importantly, the CsPbX3 perovskite prepared by the invention can keep very high stability inprotonic solvents, such as ethyl alcohol; by utilizing the high stability, the CsPbX3 perovskite prepared by the method and SiO2 are blended in absolute ethyl alcohol and are stirred vigorously, so that the CsPbX3 perovskite is fixed to the surface of the SiO2 and CsPbX3 perovskite functionalized SiO2 is obtained. Based on various advantages above, the CsPbX3 perovskite has a very good applicationprospect in the field of lighting display.

Description

technical field [0001] The invention belongs to the field of preparation of novel nanomaterials, and relates to an ultra-stable all-inorganic CsPbX synthesized at room temperature 3 Perovskite methods and their applications. Background technique [0002] All-inorganic perovskite quantum dots (CsPbX 3 ) is a new type of nanomaterial. Compared with the classic cadmium-based quantum dots, the all-inorganic perovskite quantum dots exhibit a narrower luminescence peak (15-25nm), a wider color gamut (150% NTSC), Therefore, it has an important application prospect in the field of quantum dot display. At present, the light conversion efficiency of all-inorganic perovskite quantum dots can reach more than 20%, and its luminous efficiency can reach more than 90%. It has broad application prospects in photovoltaic devices such as solar cells and displays. [0003] The preparation of perovskite quantum dots by hot injection method has weak stability, it is difficult to exist stably i...

AI Technical Summary

Problems solved by technology

[0003] The preparation of perovskite quantum dots by hot injection method has weak stability, it is difficult to exist stably in polar solvents, the synthesis steps are complicated, the synthesis process needs nitrogen protection and high temperature reaction, and the inherent defects such as difficulty in mass production hinder its further development. Applications

[0004] Recently, Zeng Haibo's research group developed a low-temperature synthetic CsPbX 3 perovskite method, compared with the traditional thermal injection method to prepare CsPbX 3 Perovskite does not require inert gas protection, and the operation is simpler, but the CsPbX prepared by this method 3 The stability of perovskite is still not enough, and it is still sensitive to air, water and protic solvents, which also limits its further application.

Images