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Europium(III) oxide (Eu2O3), is a chemical compound of europium and oxygen.

Chemical formula:Eu2O3

Molar mass: 351.926 g/mol

Appearance: white to light-pink solid powder

Odor: odorless

Density: 7.42 g/cm3

Melting point: 2,350 °C (4,260 °F; 2,620 K)

Boiling point: 4,118 °C (7,444 °F; 4,391 K)

Solubility in water:Negligible

Magnetic susceptibility (χ):+10,100·10−6 cm3/mol

Thermal conductivity: 2.45 W/(m K)

Crystal structure:Monoclinic, Cubic


It is widely used as a red or blue phosphor in television sets and fluorescent lamps, and as an activator for yttrium-based phosphors. It is also an agent for the manufacture of fluorescent glass. Europium fluorescence is used in the anti-counterfeiting phosphors in Euro banknotes.