Rare earth metal complex

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PROBLEM TO BE SOLVED : To provide a rare earth metal complex that can be excited with excitation light of a longer wavelength than the conventional compound and has superior emission intensity. SOLUTION : The rare earth metal complex comprises a rare earth metal atom and a β-diketone compound expressed by formula (1) that is coordinated to the rare earth metal atom. In formula (1), R represents a monovalent aromatic hydrocarbon group or an aromatic heterocyclic group. COPYRIGHT : (C)2012, JPO&INPIT