Hydroxylead iodide or hydroxybromo lead iodide crystal with orange-red fluorescence and preparation method of hydroxylead iodide or hydroxybromo lead iodide crystal

The invention relates to the technical field of luminescent materials, and particularly discloses a lead hydroxyiodide or lead hydroxybromide iodide crystal with orange red fluorescence and a preparation method thereof, the chemical formula of the crystal is Pb (OH) I (1-x) Brx (0 < = xlt; 1), the crystal belongs to an orthorhombic system, and the space group is Pnma. The fluorescent material disclosed by the invention is synthesized by adopting a low-energy-consumption hydrothermal method, so that energy can be saved; the raw materials used in the invention are chemicals with low price, and compared with the traditional fluorescent powder, the preparation cost can be greatly saved; most of the existing solid fluorescent powder is synthesized through high-temperature calcination, and the hydroxyl lead iodide or hydroxyl bromo lead iodide disclosed by the invention is prepared by adopting a hydrothermal method and has the advantages of simplicity and convenience in operation, short growth cycle, low cost and t