Er2Se3

Er₂Se₃ is a rare-earth selenide compound belonging to the family of lanthanide chalcogenides, materials formed from rare-earth elements and selenium. This is primarily a research and specialized material used in optoelectronic and photonic applications where rare-earth dopants enable unique optical properties such as infrared emission and luminescence. The material is of interest in the semiconductor community for applications requiring narrow bandgap characteristics and rare-earth ion transitions, though it remains largely in the experimental phase compared to more established semiconductor compounds.