Knowra Europium Europium Europium is a soft, silvery rare-earth metal with atomic number 63. Its compounds produce distinctive red and blue emissions used in phosphors and other luminescent materials.
Europium(III) oxide : Europium(III) oxide is an inorganic compound used as a red-phosphor precursor and neutron absorber. It supplies europium for red-emitting phosphors in display and lighting technologies.
Lanthanide contraction : Lanthanide contraction is the steady decrease in atomic and ionic radii across the lanthanide series. It helps explain europium’s size, bonding, and differences from neighboring rare-earth elements.
Lanthanide : A lanthanide is an element in the series from lanthanum to lutetium, characterized by filling of 4f orbitals. Europium is one of the lanthanides and shares their characteristic 4f chemistry.
Eugène-Anatole Demarçay : Eugène-Anatole Demarçay was a French chemist who isolated europium in the early twentieth century. His spectroscopic work established europium as a distinct element in 1901.
Gadolinium : Gadolinium is a lanthanide metal with atomic number 64, known for strong paramagnetism and neutron capture. It follows europium in the periodic table but is more characteristically trivalent.
Yttrium oxide : Yttrium oxide is a refractory oxide used in ceramics, coatings, and phosphor hosts. Yttrium oxide hosts europium ions in the red phosphor used in many displays.
Europium(II) : Europium(II) is europium in the +2 oxidation state, with a half-filled 4f shell. This unusually stable state gives europium chemistry distinct from the mostly trivalent lanthanides.
Rare-earth element : A rare-earth element is one of the 17 chemically similar elements comprising the lanthanides, scandium, and yttrium. Europium belongs to this group, whose similar chemistry makes separation difficult.
Paul-Émile Lecoq de Boisbaudran : Paul-Émile Lecoq de Boisbaudran was a French chemist who discovered several rare-earth elements using spectroscopy. His earlier samarium research provided material from which Demarçay identified europium.
Terbium : Terbium is a lanthanide with atomic number 65 whose compounds can emit green light. Terbium phosphors produce green emission, contrasting with europium’s prominent red and blue emissions.
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