10/30/2023 0 Comments BlendeIt can be used planar as an optical window or shaped into a lens. Zinc sulfide is also used as an infrared optical material, transmitting from visible wavelengths to just over 12 micrometers. It also exhibits phosphorescence due to impurities on illumination with blue or ultraviolet light. Copper-doped zinc sulfide ("ZnS plus Cu") is used also in electroluminescent panels. Copper gives long-time glow, and it has the familiar greenish glow-in-the-dark. Using manganese yields an orange-red color at around 590 nanometers. When silver is used as activator, the resulting color is bright blue, with maximum at 450 nanometers. The phenomenon was described by Nikola Tesla in 1893 ), and is currently used in many applications, from cathode ray tubes through X-ray screens to glow in the dark products. Zinc sulfide, with addition of few ppm of suitable activator, exhibits strong phosphorescence. A tetragonal form is also known as the very rare mineral called polhemusite, with the formula (Zn,Hg)S.Īpplications Luminescent material The transition from the sphalerite form to the wurtzite form occurs at around 1020 ☌. The hexagonal form is known as the mineral wurtzite, although it also can be produced synthetically. The more stable cubic form is known also as zinc blende or sphalerite. In each form, the coordination geometry at Zn and S is tetrahedral. This dualism is an example of polymorphism. ZnS exists in two main crystalline forms. Wurtzite, the less common polymorph of zinc sulfide
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