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Zinc selenide is an inorganic chemical compound with the formula ZnSe. It is a solid, crystalline material that appears as a yellow to orange powder. Zinc selenide is known for its wide band gap and excellent optical transparency across a broad spectrum, from the visible to the infrared. This property makes it a valuable material in various optical applications. It is a semiconductor with a cubic zincblende crystal structure. Zinc selenide can be synthesized through several methods, including chemical vapor deposition (CVD) and direct reaction of elemental zinc and selenium. It is relatively soft and brittle, with a Mohs hardness of around 2.5. The compound is insoluble in water but can react with acids. Its thermal conductivity is moderate. Due to its optical properties, zinc selenide is commonly used in the manufacturing of windows, lenses, and prisms for infrared spectroscopy and thermal imaging systems. It is also utilized in some types of lasers and in electroluminescent devices. While it has beneficial optical characteristics, zinc selenide is a toxic compound, and proper handling procedures are necessary during its production and use.