Er2S2O

Er₂S₂O is an erbium oxysulfide ceramic compound combining rare-earth erbium with sulfur and oxygen constituents. This material belongs to the family of rare-earth oxychalcogenides, which are primarily of research interest for their potential in photonic and electronic applications where the rare-earth dopant properties can be leveraged. While not yet widely established in mainstream engineering applications, oxysulfide ceramics are being explored for optical coatings, luminescent materials, and potential high-temperature ceramic matrix applications where erbium's infrared emission characteristics may be valuable.