Used as a catalyst in coupling reactions such as Ullmann (for aryl halides) and Glaser (for terminal alkynes), enabling carbon-carbon bond formation in organic synthesis, commonly in laboratory and pharmaceutical industries. Employed in photovoltaic cells, thin-film solar cells, and semiconductor devices due to its favorable electronic properties, including good electrical conductivity and light absorption. Acts as a source of iodide ions in the preparation of radiopharmaceuticals. Utilized in luminescent materials and sensors because of its light-emitting characteristics under certain conditions. Also applied in wood preservatives and antifouling coatings for marine paints to prevent microbial and algal growth. In animal nutrition, serves as a supplement providing both copper and iodine to prevent deficiencies in livestock feed.