ErS

Erbium sulfide (ErS) is a rare-earth ceramic compound belonging to the family of lanthanide chalcogenides, characterized by strong ionic bonding between erbium cations and sulfide anions. While primarily investigated in research contexts for optoelectronic and photonic applications, ErS and related rare-earth sulfides are explored for their potential in infrared optics, phosphor materials, and semiconductor devices where the unique electronic properties of rare-earth elements offer advantages over conventional ceramics. The material represents an emerging class of functional ceramics rather than an established industrial commodity, with continued development focused on synthesizing high-purity forms and understanding its performance in specialized optical and thermal applications.