Preparation method of bromine-free or bromine-doped zero-dimensional manganese-based hybrid perovskite green fluorescent material

The invention relates to a preparation method of a bromine-free or bromine-doped zero-dimensional manganese-based hybrid perovskite green fluorescent material in the field of luminescent materials, and the specific process is as follows: adding a racemic 3-chloro-2-hydroxypropyl trimethyl ammonium chloride aqueous solution and manganese chloride/manganese bromide into a methanol solution to form grass green precipitate; adding a proper amount of hydrochloric acid/hydrobromic acid into the mixture until the precipitate is completely dissolved, then putting the mixed solution into an oven, and baking at 70-120 DEG C for 72-90 hours to obtain a green blocky crystal [C6H15ClNO] 2 [MnCl (4-xBrx)], xlt; 4, yellow-green/green fluorescence is generated under the irradiation of 365nm laser; the net mass ratio of the racemic 3-chloro-2-hydroxypropyl trimethyl ammonium chloride to the manganese chloride to the manganese bromide to the hydrochloric acid to the hydrobromic acid is 188 to (0 to 150) to (350 to 50) to (100