Electroluminescent devices incorporating mixed metal organic complexes

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An electroluminescent device in which there is an electroluminescent which comprises a complex of general formula (Lα)nM1M2 or of general formula (Lα)n M1M2 (Lp), where Lp is a neutral ligand and where M1 is a rare earth, transition metal, lanthamide or an actimide, M2 is a non rare earth metal, Lαis an organic complex and n is the combined valence state of M1 and M2.