Dual-functional copper(I) halides with solvent-induced rapid luminescence switching toward information encryption and white-light emission.

Solvent-triggered structural transitions offer critical insights into luminescence modulation in metal halides. Herein, two novel and stable zero-dimensional copper(I) halides were synthesized, exhibiting controllable phase transitions and concurrent luminescence switching upon methanol stimulation, highlighting their promising potential for information encryption and white-light-emitting (WLED) applications.