Glass containing rare earth ion doped lutetium iodide micro-crystals and preparation method of glass film

The invention discloses glass containing rare earth ion doped lutetium iodide micro-crystals and a preparation method of a glass film. The glass is characterized by being prepared from the following raw materials by mole percent: 73-75mol% of ethyl orthosilicate, 5-16mol% of niobium ethoxide, 10-15mol% of lutetium iodide and 1-5mol% of rare earth iodide, wherein rare earth iodide is one of cerium iodide, europium iodide and terbium iodide. The glass has the advantages as follows: a sol-gel method is a low-temperature wet-chemical method glass preparation technology, and the glass is obtained through hydrolysis and polymerization chemical reaction of precursor raw materials, so that the glass can be prepared into a film material at a certain liquid viscosity and iodide raw materials are prevented from being decomposed and volatilized through low-temperature synthesis conditions; the glass prepared through the sol-gel method can generate a certain micropores in the material due to volatilization and decomposition of the solvent, and the micropores provide the good environment for generation of nano iodide micro-crystals, so that defects that crystallization particles are nonuniform and glass devitrification occurs due to incomplete uniformity of glass smelting chemical constituents and crystallization processing temperature can be overcome to a certain extent.