RbPb2Cl5 is a crystal composed of rubidium, lead and chloride atoms. It belongs to the family of mixed-alkali halides, which have potential applications in nonlinear optics, scintillation, and laser technologies. The crystal structure of RbPb2Cl5 is hexagonal, and it has a high refractive index, high nonlinear optical susceptibility, and good thermal stability, making it an attractive material for nonlinear optics experiments and applications.