RARE EARTH METAL ION COMPLEX, LUMINESCENT COMPOSITE MATERIAL, LIGHT EMITTING DEVICE, AND USE

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The invention relates to a rare earth metal ion complex for luminescent composite (3) material for wavelength conversion. The complex has the following formula (1) : [Ln(L1)3L2], wherein Ln represents a trivalent rare earth metal ion; L2 represents a bidentate ligand containing nitro-gen; and L1 represents a diketonate ligand derivative having the following formula (2) wherein R1 represents an alkyl group, a fluoroalkyl group, or a substituted or an unsubstituted aryl group; R2 represents a hydrogen atom, an alkyl group, a fluoroalkyl group, a substituted or an unsubstituted aryl group, a halogen atom, or a NO2 group; R3 represents an alkyl group, a substituted or unsubstituted aryl group, a halogen atom, or a NO2 group; and RF represents an alkyl group substituted with at least one fluorine atom.