Zinc sulfide layers are relatively soft, insoluble in water, but slightly hygroscopic. The latter will promote the growth of the more stable cubic phase. Other Applications Zinc sulfide films have been used to passivate and AR coat some semiconductors.
Dense films possess a high dielectric constant.
When doped with appropriate impurities, phosphors for electroluminescent displays can be made. Developments using these phosphors as thick films are in progress for electro-optical switching applications. Water Solubility Essentially insoluble. There is essentially no water penetration into solid pieces. While zinc sulfide can be evaporated by E-beam, thermal evaporation is generally used in optical work.