Preparation method of all-inorganic cesium-lead-bromine perovskite nanocrystal with adjustable fluorescence peak position

The invention belongs to the technical field of preparation of nanocrystals, and provides a preparation method of an all-inorganic cesium-lead-bromine perovskite nanocrystal with an adjustable fluorescence peak position. According to the preparation method, the bidentate alkyl acid ligand is introduced in situ, so that the morphology of the all-inorganic cesium-lead-bromine perovskite nanocrystal is accurately regulated and controlled; therefore, the emission range of photoluminescence of the all-inorganic cesium-lead-bromine perovskite nanocrystal from green light to blue light is adjustable. Meanwhile, according to the preparation method, the morphology regulation and control of the all-inorganic cesium-lead-bromine perovskite nanocrystal can be realized only by adding the bidentate alkyl acid ligand into the precursor solution on the basis of the method for preparing the all-inorganic cesium-lead-bromine perovskite nanocrystal by a precipitation method. The method for regulating and controlling the morphol