Ba2ErGaSe5

Ba₂ErGaSe₅ is a quaternary chalcogenide semiconductor compound combining barium, erbium, gallium, and selenium in a fixed stoichiometric ratio. This material belongs to the family of rare-earth-containing selenide semiconductors, which are primarily investigated in research settings for their potential infrared optoelectronic and photonic applications. The incorporation of erbium—a lanthanide element—positions this compound as a candidate material for mid-infrared emission and nonlinear optical devices, though it remains largely in the exploratory phase rather than established commercial production.