Cd2S

Cadmium sulfide (Cd₂S) is an inorganic ceramic compound belonging to the II-VI semiconductor family, historically used as a yellow pigment and optical material. It finds application in optoelectronic devices, photoresistors, and photodiodes where its bandgap energy enables light detection in the visible spectrum, though its use has declined in some regions due to cadmium toxicity concerns and regulatory restrictions. Engineers considering this material should note it remains relevant in specialized optoelectronic and sensing applications where its optical properties cannot be readily replaced by non-toxic alternatives.