The invention relates to the technical field of
perovskite quantum dots, in particular to a surface ligand precursor solution of blue-light
perovskite quantum dots, which is prepared by the following steps: preparing a cesium /
rubidium precursor and a
zinc / lead
halide precursor solution, quickly thermally injecting the cesium /
rubidium precursor solution into the
zinc / lead
halide precursor solution, adding
ethyl acetate, and performing centrifugal purification to obtain a coarse precipitate; and dropwise adding methylbenzene for dissolving, centrifuging and purifying to obtain
quantum dot precipitates, and uniformly dispersing the
quantum dot precipitates into normal
octane to obtain the
quantum dot. According to the blue-light
perovskite quantum dot,
rubidium and
zinc are co-doped to form a more stable perovskite
crystal form with
halide ions, a surface ligand precursor solution of the blue-light perovskite quantum dot is formed,
chloride ions, rubidium ions and zinc ions have higher tolerance factors, a more regular
crystal structure is formed, the
ion radius of rubidium is smaller than that of cesium, and the blue-light perovskite quantum dot is more stable.
Quantum dot
crystal lattices are shrunk after rubidium
doping, Zn-Cl bonds are more stable than Pb-Cl bonds due to zinc
doping,
chloride ion vacancy defects are reduced, and the stability of the quantum dots is improved.