Vapochromism and Enhanced Yellow Emission of CuI Under Ammonia Vapor

-I related emissive centers. Similar yellow emission ~615 nm is observed when CuI powders are exposed to various amino-containing organic molecules, suggesting that the formation of Cu(I)-amine surface complexes and the associated yellow emission could be a general phenomenon for nitrogen-coordinating species. These findings provide a simple vapor-assisted strategy to tune and enhance the emission of CuI powders and highlight their potential as vapochromic fluorescent probes for ammonia and amines, as well as phosphor candidates for low-cost light-emitting applications.