PHOSPHINE OXIDE COMPOUND, RARE EARTH COMPLEX, AND LIGHT-EMITTING MATERIAL

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Disclosed are : a phosphine oxide compound represented by formula (I), in which n represents an integer of 3 or higher, Ar1 represents an aromatic group of valence n, L represents a divalent linker group, and Ar2 and Ar3 each independently represent a monovalent aromatic group; and a rare earth complex including the phosphine oxide compound.