09-27-2021-2011 - Arsenic triselenide

 Arsenic triselenide (As₂Se₃) is an inorganic chemical compound, a selenide of arsenic.

Amorphous arsenic triselenide is used as a chalcogenide glass for infrared optics. When purified, it transmits light with wavelengths between ca. 0.7 and 19 µm.^[3]

Arsenic triselenide is covalently bonded. Even so, the arsenic has a formal oxidation state of +3.

Solution processed thin film As₂Se₃[edit]

Thin film selenide glasses have emerged as an important material for integrated photonics due to its high refractive index, mid-IR transparency and high non-linear optical indices. High-quality As₂Se₃ glass films can be deposited from spin coating method from ethylenediamine solutions.^[4]

https://en.wikipedia.org/wiki/Arsenic_triselenide