Rare earth metal complex, and using the same medium, light-emitting element, a lighting device an

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PROBLEM TO BE SOLVED : To provide a rare earth complex having high brightness and a long life, and to provide a fluorescent medium, a light-emitting medium, a security medium and a lighting device using the complex. SOLUTION : The rare earth complex contains a plurality of rare earth ions, and a phosphine oxide ligand, and the phosphine oxide ligand has a molecular structure represented by formula (1) (wherein, m, n and o are each an integer of ≥1; R1to R6are the same or different and each saturated hydrocarbon which may be substituted, aryl which may be substituted, heteroaryl which may be substituted or aralkyl which may be substituted, and neighboring R1and R2, R3and R4or R5and R6on the same phosphorus atom may form a ring by bonding to each other). COPYRIGHT : (C)2011, JPO&INPIT