Lithium fluoride, 99.0+%

Lithium fluoride is an inorganic compound with the formula LiF. It is the lithium salt of hydrofluoric acid. This white solid is a simple ionic compound. Its structure is analogous to that of sodium chloride, but it is much less soluble in water.

It is mainly used as a component of molten salts. Formation of LiF releases one of the highest energy per mass of reactants, only second to that of BeO. Because of its large band gap, LiF crystals are transparent to short wavelength ultraviolet radiation, more so than any other material. LiF is therefore used in specialized UV optics.

Lithium fluoride is widely used in PLED (polymer light-emittng diodes) as a coupling layer to enhance electron injection. The thickness of LiF layer is usually around 1 nm.