Method for preparing inorganic halogenated lead cesium perovskite quantum dots and display device

A method for preparing inorganic halogenated lead perovskite quantum dots (PQDs), comprising the following steps:

• a first coordination solution preparing step, comprising mixing and heating a first lead halide solid and a first solvent in a reaction vessel until the first lead halide solid is completely dissolved to obtain a first coordination solution;
• a cesium oleate solution preparing step, comprising mixing and heating a cesium carbonate solid and a second solvent in a container until the cesium carbonate solid is completely dissolved;
• a centrifugal separation step, comprising heating the first coordination solution and adding the cesium oleate solution to the first coordination solution, cooling the first coordination solution to room temperature to obtain a first mixed solution, and centrifuging the first mixed solution to obtain first quantum dots;
• a second coordination solution preparing step, comprising mixing and heating a second lead halide solid and the first solvent in a reaction vessel until the second lead halide solid is completely dissolved to obtain a second coordination solution;
• and
• a first ion exchange step, comprising re-dispersing the first quantum dots in a non-polar organic solvent, adding the second coordination solution dropwise to the non-polar organic solvent, performing an ion exchange reaction to obtain a second mixed solution, and centrifuging the second mixed solution to obtain second quantum dots;
• wherein
• the first quantum dots and the second quantum dots are both the inorganic halogenated lead perovskite quantum dots.