Sm1 Tl1 Se2

SmTlSe₂ is a ternary chalcogenide semiconductor compound combining samarium (a rare earth element), thallium, and selenium. This is a research-phase material rather than a commercially established compound, belonging to the broader family of rare-earth-based semiconductors being investigated for specialized optoelectronic and solid-state device applications. The material's semiconducting behavior and rare-earth content make it potentially interesting for narrow-bandgap or infrared applications, though its practical use remains largely confined to experimental work in condensed-matter physics and materials research laboratories.