Pr2Ge2Se7

Pr₂Ge₂Se₇ is a rare-earth germanium selenide compound belonging to the family of chalcogenide semiconductors, combining praseodymium (a lanthanide) with germanium and selenium. This is primarily a research material of interest for its potential in infrared optics and photonic applications, where chalcogenides are valued for transparency in the mid- and far-infrared spectrum beyond the range of conventional oxide glasses. The material represents an emerging class being explored for infrared windows, fiber optics, and potential nonlinear optical devices, though it remains largely in the experimental/development phase rather than mainstream industrial production.