An electroluminescent device in which there is an electroluminescent which comprises a complex of general formula (L.sub..alpha.).sub.nM.sub.1M.sub.2 or of general formula (L.sub..alpha.).sub.n M.sub.1M.sub.2 (L.sub.p), where L.sub.p is a neutral ligand and where M.sub.1 is a rare earth, transition metal, lanthamide or an actimide, M.sub.2 is a non rare earth metal, L.sub..alpha.is an organic complex and n is the combined valence state of M.sub.1 and M.sub.2.