K2NaTmCl6

K2NaTmCl6 is a rare-earth halide ceramic compound containing potassium, sodium, thulium, and chlorine. This is a research-phase material studied for its potential in optical and photonic applications, particularly in rare-earth doped systems where thulium provides useful luminescence properties in the near-infrared spectrum. The compound belongs to the family of double perovskite and elpasolite halides, which are of interest in solid-state laser technology, scintillation detection, and photonic devices, though it remains primarily in experimental development rather than established industrial production.