The rare earth metal having arom. org. ligand complex luminescent material

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A rare earth metal complex represented by the formula (1) below emits very monochromatic light which is derived from the rare earth metal ions, and provides a light-emitting material having high luminous (quantum) efficiency and excellent durability. [In the formula, M represents La or the like; A represents a benzene ring or the like; R represents -COO group or the like; R and R independently represent a hydrogen atom, halogen atom or the like; and n and m respectively represent an integer of 1 or more.]